These articles explore the body, the mind, the environment, and the systems that shape human health. Each piece is written to make complex ideas easier to understand, whether the topic is training, nutrition, sleep, stress, digestion, symptoms, physiology, disease, or the way modern life affects how we feel and function.
Strength, Health, & the Art of Living Well
Speed: What Actually Makes Someone Faster
Speed is produced by several underlying adaptations, and each requires a different type of stimulus.
Coordination is one of the most specific. To improve the coordination of a fast movement, that movement has to be practiced quickly. Slow practice does not fully develop the motor program required at maximal velocity. This is why sprinting, jumping, throwing, or other high-speed tasks need to be performed at or near the speed the athlete is trying to improve.
The quality of each repetition matters. Once fatigue causes the athlete to slow down, the training stimulus changes. High-velocity work therefore does not need to follow traditional high-volume set-and-rep structures. A small number of maximal-quality repetitions may be more useful than continuing after velocity has fallen.
Motor-unit recruitment is different because it is primarily muscle-specific rather than movement-specific. Heavy strength training and brief maximal isometrics can improve recruitment and contribute to faster performance even though those exercises are not performed at maximal velocity.
Other adaptations, however, require actual fast movement. Increased motor-unit firing rates and increased muscle-fiber shortening velocity do not appear to develop from heavy strength training alone. They require genuinely high movement speeds. Maximal intent with a slowly moving heavy load is therefore not a substitute for fast training.
Strength work can also interfere with speed when poorly managed. Excessive fatigue can promote shifts toward slower muscle-fiber characteristics, and unnecessary hypertrophy can add mass that the athlete then has to accelerate and decelerate. This is especially relevant when muscle is added distally rather than around the hips.
Actionable takeaway: Train speed through three main targets: practice the actual fast movement for coordination, use heavy work or brief isometrics to improve transferable recruitment, and include genuinely maximal-velocity work to improve firing rate and shortening velocity. Stop the work when speed begins to fall.
Maximum Strength: What Actually Makes Someone Stronger
Maximum strength can improve through several different adaptations, and those adaptations do not all transfer equally to other movements.
Coordination is one contributor. Repeated practice can make an exercise more efficient, allowing someone to lift more weight without necessarily increasing the force-producing capacity of the muscle itself. This type of improvement is highly specific to the movement and even to the load being used. Becoming more skilled at a heavy squat is therefore very useful for a powerlifter, but that coordination does not automatically transfer to sprinting or jumping.
Motor-unit recruitment is much more transferable. Improving the nervous system’s ability to activate more of a muscle increases the force that muscle can produce across different movements that use it. High recruitment can be trained through heavy lifting, brief maximal isometrics, and other high-effort contractions, provided fatigue and discomfort are kept low enough to allow high central motor command.
Hypertrophy contributes by increasing the amount of contractile tissue available to produce force. For athletes, however, the location of that muscle matters. Adding muscle where it contributes to the demands of the sport can be useful, while adding mass indiscriminately may not be.
Other adaptations can also contribute. Reduced antagonist co-activation can increase net force around a joint. Lateral force transmission can improve how efficiently muscle-fiber force reaches the tendon. Increased tendon stiffness can improve force production in slow, high-force actions by changing how quickly the muscle fibers themselves have to shorten.
The important point is that the same improvement in a strength test can come from very different mechanisms.
Actionable takeaway: Do not treat “getting stronger” as one process. Identify whether the goal is movement skill, greater muscle activation, more muscle, or another force-producing adaptation, and program specifically for that need.
Strength, Speed, and Power: Understanding the Relationship
Strength, speed, and power are performance outcomes. They are things we measure, not single adaptations that the body develops directly.
An increase in strength might come from greater muscle size, improved motor-unit recruitment, better coordination, changes in tendon behavior, or other adaptations. Speed works the same way. A faster sprint, jump, or throw tells us performance improved, but the useful question is what changed underneath that performance.
Power sits one level higher because it is the product of force and velocity. That means transferable power is improved by increasing force capability, velocity capability, or both. This is important because the load that produces the highest measured power in a gym exercise is not necessarily the load that best develops either quality. Heavy loading is better suited to high-force adaptations, while very light or unloaded movements performed at genuinely high speeds are better suited to high-velocity adaptations.
Strength also does not automatically become speed. The force a muscle can produce decreases as shortening velocity increases, so an athlete can be very strong at slow speeds while still lacking the ability to produce force at high velocities. Likewise, intending to move a heavy load quickly is not the same as actually moving quickly. Speed-specific adaptations require exposure to genuinely fast movement.
Fatigue therefore matters because it can reduce the athlete’s ability to reach the velocities required for speed development. High-velocity work should be performed while the athlete is fresh enough to actually express speed.
Actionable takeaway: Decide whether you, or the athlete, primarily needs more force, more speed, or both. Train those qualities directly and protect the quality of the stimulus by limiting unnecessary fatigue.
Cardio and Lifting: How to Do Both Without Killing Your Progress
There is an old idea in strength training that cardio kills your gains. Like most absolutes in fitness, it takes something that can happen under certain conditions and turns it into a rule that supposedly applies to everyone. Cardio does not automatically prevent you from getting stronger or building muscle, and for most people there is no reason they cannot improve their cardiovascular fitness while continuing to make progress in the weight room. The problem begins when the cardio you are doing creates enough fatigue, muscular stress, or recovery demand that it starts compromising the lifting responsible for the result you actually care about.
This is why the first question should not be whether cardio is good or bad for muscle growth. The better question is why you are doing cardio in the first place. Someone walking to increase energy expenditure during a fat-loss phase, someone doing moderate aerobic work for cardiovascular health, and someone preparing for a marathon are all technically “doing cardio,” but they are solving completely different problems. The purpose of the cardio should determine the modality, frequency, intensity, and amount you use, as well as how much of your recovery you are willing to dedicate to it.
Why Are You Doing Cardio?
For someone primarily focused on body composition, cardio is usually a tool for increasing activity and energy expenditure. In that situation, there is very little reason to immediately choose the hardest form available. Daily walking, incline treadmill work, easy cycling, or other low-intensity activity can increase expenditure while creating relatively little additional fatigue. For some people, simply increasing daily steps will accomplish what they need. If more activity is necessary, adding 20–30 minutes of low-intensity cardio after lifting sessions is a reasonable place to start and can be increased only when the goal actually requires it.
Cardio for general health serves a different purpose. Here the objective is to improve cardiovascular fitness and aerobic capacity rather than simply burn additional calories. Regular moderate aerobic work that can be repeated and recovered from makes sense, and something in the range of 20–40 minutes two or three times per week can be a practical starting point. This work does not need to become another maximal training session. HIIT can have a place, but harder work is not automatically more useful when the desired adaptation can be achieved with a lower recovery cost.
Endurance performance changes the conversation again because specificity now matters. If you want to become a better runner, you eventually have to run enough to improve at running. If you are preparing for a marathon, the volume, frequency, and specificity of the endurance work have to become large enough to drive those adaptations. At that point, cardio is no longer simply supporting your lifting program; it has become one of the primary goals of the training phase. Some reduction in the rate of hypertrophy may come with that shift, but that is not necessarily a programming mistake. It is the predictable cost of prioritizing a different quality.
Where the Interference Actually Comes From
Combining resistance training and endurance work is commonly referred to as concurrent training, and the potential reduction in strength or hypertrophy adaptations is usually called the interference effect. This has often been interpreted to mean that cardio somehow burns muscle or shuts down muscle growth, but that is an overly dramatic way to describe what is usually a much simpler problem. Concurrent training generally does not appear to produce a large reduction in whole-muscle hypertrophy under normal conditions, although some forms of aerobic work seem to create more interference than others. The practical issue is usually the total amount of stress being accumulated and whether the person can continue recovering well enough to train productively.
Three variables are especially useful when thinking about that stress: frequency, intensity, and modality. The more often you perform cardio, the harder those sessions are, and the more muscular damage or impact the modality creates, the more likely it is to compete with the resistance training you are trying to prioritize. There is no universal number of sessions where cardio suddenly becomes excessive because recovery capacity differs from person to person. Someone sleeping well, eating enough, and performing relatively low-fatigue aerobic work may tolerate a considerable amount. Someone dieting aggressively, training legs hard several times per week, sleeping poorly, and adding frequent running sessions may reach their limit much sooner.
Intensity changes the cost of the work considerably. Walking, incline treadmill work, and easy cycling generally create relatively little fatigue, which is why they can usually be performed more frequently. Hard intervals and sprint work are different. They may be more time-efficient, but they also create a larger recovery demand and overlap more heavily with the high-intensity muscular work already being performed in the weight room. If the purpose of cardio is simply to increase energy expenditure during a body-composition phase, turning every session into HIIT often creates more fatigue than the goal requires.
Modality matters for the same reason. Walking and cycling generally create less impact and eccentric muscular stress than running. Running is not inherently bad for hypertrophy, but it tends to be more expensive from a recovery standpoint, particularly as volume and intensity rise. If someone is preparing for a race, that cost is necessary because running is the adaptation being pursued. If someone is simply trying to burn a few extra calories while maximizing lower-body hypertrophy, choosing a lower-cost modality is usually the more sensible option. The principle is simple: use the least costly tool that still accomplishes the job.
The Mechanism Is Probably Less Complicated Than It Sounds
A great deal of discussion around concurrent training has focused on molecular signaling. One of the better-known explanations was that endurance exercise activates AMPK and other signaling pathways associated with aerobic adaptation, which could suppress mTOR signaling and interfere with the muscle-building response to resistance training. That explanation is interesting, but the evidence has not supported such a clean relationship. Aerobic and resistance exercise can be performed in relatively close proximity without necessarily producing the kind of suppression of anabolic signaling that the original hypothesis predicted.
There are other molecular explanations that remain possible, but from a coaching standpoint there is a much simpler explanation that matters more: fatigue reduces what you are able to do in the gym. Resistance training needs to provide enough tension and effort to stimulate the muscle fibers you are trying to grow. If hard cardio leaves you fatigued before your next lifting session, you may use less weight, perform fewer reps, produce less force, or struggle to recruit the same high-threshold motor units you otherwise could. An isolated bad workout does not matter much, but if cardio repeatedly reduces the quality of the resistance-training stimulus, the accumulated result can be less hypertrophy than you would have achieved otherwise.
That is the useful way to think about the interference effect. Cardio does not have to directly destroy muscle to interfere with muscle growth. It simply has to make the training responsible for building that muscle consistently worse.
If Muscle Is the Goal, Protect the Lifting
Once the priority is clear, the order of training becomes fairly straightforward. If size and strength are the primary goals, lifting should receive the best of your energy and recovery. That generally means resistance training comes first when lifting and cardio need to happen on the same day. Low-intensity work can often be performed immediately afterward because it creates relatively little additional fatigue. If the cardio session is harder, separating the two sessions by several hours can be useful so there is time to eat, hydrate, and regain some performance capacity before training again.
The exact number of hours is not magical. Something around three to six hours is a reasonable practical guideline when the second session is more demanding, but the larger principle is simply to avoid asking the body to perform two difficult sessions back-to-back when there is no need to do so. If the goal is hypertrophy, the resistance-training session is the one you want to protect.
There is also a difference between separating training sessions and separating training days. Coaches sometimes alternate lifting and cardio throughout the week because it appears to create more recovery between each type of training. In reality, this can leave the same muscles working almost every day. A lower-body session on Monday, running on Tuesday, another leg workout Wednesday, and more conditioning Thursday technically separates the modalities while providing very little actual recovery for the legs.
In many cases, it makes more sense to consolidate the stressors. Place cardio on the same days as lifting when appropriate, perform the lifting first, and then leave complete recovery days afterward. This concentrates the workload into fewer days and gives the muscles and nervous system longer uninterrupted periods to recover. For someone whose main goal is hypertrophy, that can be a much cleaner way to organize concurrent training than spreading some form of lower-body stress across the entire week.
How Much Cardio Should You Actually Do?
There is no single cardio prescription because the amount should come from the goal rather than from the belief that more exercise is automatically better. If body composition is the priority, start with daily movement and use steps as the first lever. If additional expenditure is needed, add 20–30 minutes of low-intensity work after lifting sessions and assess what happens before doing more. If fat loss is already progressing at the desired rate, adding more cardio simply because it is available does not accomplish anything useful.
For general health, the goal is to establish a consistent aerobic base that complements resistance training. Moderate aerobic sessions a few times per week are enough to provide meaningful cardiovascular work for many people without turning the entire program into conditioning. Higher-intensity intervals can be added if there is a reason for them, but they should not automatically replace lower-intensity work simply because they feel more difficult.
For endurance performance, the required amount becomes much more specific to the event. More running, cycling, intervals, or longer sessions may be necessary, and eventually that increased workload has to be reflected elsewhere in the program. Resistance-training volume may need to come down, lower-body training may need to be reorganized, and expectations for hypertrophy may need to change during that phase. Training resources are finite, so increasing the priority of one quality inevitably changes how much can be invested in another.
You Can Improve Both, but One Has to Take Priority
This is ultimately the part of concurrent training that people tend to avoid. You can improve multiple qualities at the same time, but you cannot assume that every quality can be maximized simultaneously. If bodybuilding is the goal, lifting should drive the program and cardio should support body composition, health, or conditioning without consistently compromising resistance-training performance. If you decide to prepare for a marathon, endurance training becomes the primary focus and hypertrophy takes a secondary role for that period.
Neither choice is better. They simply require different programs. The problem begins when someone says muscle growth is the priority while training like an endurance athlete, or says endurance performance is the priority while refusing to give it enough training volume because they are afraid of sacrificing any hypertrophy. The goal has to determine what receives the majority of your time, effort, and recovery.
The simplest way to know whether you have found the right balance is to watch the thing you are trying to protect. If your loads, repetitions, execution, and recovery continue improving while cardio is in the program, there is little reason to assume the cardio is meaningfully interfering. If your legs are constantly fatigued, performance begins to fall, soreness never resolves, or progression stalls after cardio volume increases, the dose has probably exceeded what you can currently recover from. At that point, reduce the frequency, lower the intensity, choose a less demanding modality, reorganize the week, or improve the recovery supporting the training.
Cardio and lifting are not natural enemies. The problem is usually trying to do more work than the goal requires or more work than the athlete can recover from. Determine why the cardio is there, choose the modality that accomplishes that goal with the lowest necessary recovery cost, give the priority training the best of your performance, and adjust the total dose according to what your body is actually showing you. You can improve both cardiovascular fitness and muscle mass. You simply have to be clear about which one leads when the demands begin to compete.
P&G Bought Thorne. Here’s Why I’d Start Looking Elsewhere
I’ve used Thorne supplements for years, and I still think they’ve been a very good company. Their reputation was earned through strong formulations, quality standards, testing, and credibility with health professionals.
But this week, Procter & Gamble agreed to acquire Thorne for $3.8 billion.
That acquisition is worth paying attention to.
In 2023, private-equity firm L Catterton purchased Thorne for approximately $680 million and took the company private. Less than three years later, it’s being sold to P&G for $3.8 billion. During that time, Thorne has continued growing, with sales reportedly expected to reach roughly $650 million this year.
In other words, P&G isn’t buying a struggling supplement company that needs to be fixed.
It’s buying a successful premium wellness brand.
And arguably, the most valuable thing it’s buying isn’t the capsules in the bottles. It’s the credibility Thorne spent decades building.
That’s becoming increasingly valuable to companies like P&G as consumers spend more money on health, prevention, supplements, and premium wellness products. Rather than building that trust from scratch, a large consumer company can simply acquire a brand that already has it. P&G already owns supplement and wellness brands including New Chapter, Align and Metamucil, and the Thorne acquisition represents a much larger push into the category.
The problem is that ownership transfers immediately. Trust doesn’t.
Nothing about this acquisition means the Thorne products sitting on the shelf suddenly became worse. And there’s currently no evidence that P&G has plans to reduce ingredient quality, changed formulations, or lower Thorne’s manufacturing standards.
My concern is what happens over time.
When a company spends $3.8 billion on an acquisition, that investment eventually has to produce a return. Growth, margins, distribution, manufacturing costs, ingredient costs and product profitability all become part of the equation.
That doesn’t guarantee Thorne’s quality will decline. But it does change the incentives surrounding the brand.
And when the reason I was willing to pay a premium for Thorne in the first place was its reputation for quality, that’s enough for me to start considering alternatives rather than waiting to find out what changes under new ownership.
So, What Should You Look For Instead?
If you decide to move away from Thorne, the goal should be to find a company that still prioritizes the same things that made Thorne worth using in the first place: quality ingredients, strong formulations, reliable manufacturing, and meaningful testing.
That’s one reason I’ve used NutriDyn alongside Thorne for years.
NutriDyn is a smaller, pharmacedical grade, practitioner-focused supplement company with a strong emphasis on formulation, manufacturing standards, ingredient quality, and third-party testing. More importantly, they already make alternatives to many of the Thorne products I’ve commonly used and recommended.
So rather than telling people to stop using Thorne without giving them somewhere to go, I put together a simple Thorne → NutriDyn replacement guide with comparable options for many of Thorne’s most popular supplements.
“N/A” means there is no direct NutriDyn replacement listed in this guide. Products marked “consider” are alternatives rather than exact matches.
The Apparent Confusion About Progressive Overload
Apparently, there is a growing disagreement online about progressive overload. Most of it comes from confusing cause and effect, while different people use the same term to mean slightly different things.
Brosef’s explanation from the bench next to you usually goes like this: you get stronger by continually adding more weight to the bar. Since strength and load rise together, it must be the added weight that produced the improvement.
This explanation makes intuitive sense and works reasonably well for beginners, who often improve fast enough to add weight almost every workout. However, it puts the plates before the muscle by mistaking the visible result of progress for the process that made it possible.
The process of building strength starts when you expose the body to a challenging training stimulus. In response, the body may improve neural coordination, become more efficient at the movement, and increase its ability to produce force. Once those adaptations occur, the same weight becomes easier relative to your new capacity. At that point, you can adjust the training demand by adding weight, reps, or changing another variable to keep the stimulus productive.
This creates a repeating cycle:
Training stimulus → Adaptation → Improved performance → Adjusted stimulus
Or, more simply:
You perform a set of five reps → You get stronger → That same set becomes easier → You add some weight to keep it challenging.
Increasing the load can help drive further adaptation, but the increase works best when supported by the capacity you have already developed. When someone forces more weight before their performance has improved, range of motion often shortens, technique breaks down, and control suffers. The number on the bar went up, but the ability being trained likely did not.
Another point of disagreement is how broadly progressive overload should be defined. Some people use it almost exclusively to mean adding weight. Others include more reps, better execution, increased range of motion, or more total work. These can all change the training demand, but they do not demonstrate the same kind of progress.
Adding a rep with the same load, range of motion, and technique provides clear evidence of improved performance. Adding another set increases total training volume, which may be useful for hypertrophy, but it represents a programming adjustment rather than direct evidence that performance on a given exercise has improved. Better execution or greater range of motion may also represent meaningful improvement, although changing the conditions of the movement makes comparison less direct.
Progression works best when it responds to meaningful improvements in capacity rather than forcing the numbers upward at all costs. You apply an appropriate stimulus, recover, monitor performance, and increase the demand when your performance supports the adjustment.
This brings us back to the original confusion between cause and effect. Because the weight on the bar usually increases as you become stronger, it's easy to assume that adding weight is what created the strength. The process works as a cycle: the existing training stimulus produces adaptation, that adaptation improves performance, and improved performance allows you to increase the demand. The heavier load then becomes part of the next stimulus and may contribute to further adaptation.
Progressive overload is therefore the ongoing adjustment of training demands as the body adapts. The controversy becomes much easier to understand once you recognize that progression can be both the result of the adaptation that came before it and part of the stimulus that produces what comes next.
Strength and Training Tolerance Are Different Capacities
The ability to lift a weight and the ability to recover from lifting it are not the same thing.
A workout is usually judged by what someone can complete. If they can move the weight, maintain decent technique, and finish the set, it's assumed the training was appropriate. But completing the work only proves that they were capable of producing enough force in that moment. It doesn’t tell us how much the workout cost them or whether their body can turn that stress into progress.
Two people can perform the same exercise with the same weight and have completely different responses. One may recover quickly and return stronger. The other may experience a large drop in performance, remain sore for several days, and struggle through their next workout. They completed the same task, but the biological cost wasn’t the same.
To understand why, we have to look beyond whether the weight moved and consider what the muscle had to do to move it.
Muscle growth begins when the fibers inside a muscle experience enough mechanical tension to signal that they need to become better prepared for similar demands in the future. Heavy weights can create this tension immediately because the muscle has to produce a lot of force to move them. Lighter weights can also create it, but usually only after fatigue builds and the final repetitions become difficult.
This is why hard sets performed close to failure can stimulate growth. As the set becomes more demanding, the repetitions slow down, the body recruits more muscle fibers, and those fibers are forced to produce more tension.
However, the same set that creates the growth signal also creates fatigue and disruption. The body must restore energy, regulate calcium inside the muscle, repair damaged tissue, and return the muscle to normal before it can fully adapt.
A workout provides the reason to grow, but recovery is where that growth is actually built. The body can increase muscle protein synthesis for two different reasons. It may be using new protein to build the muscle larger, or it may simply be repairing tissue that was damaged during training.
Those processes can happen at the same time, but they don't produce the same outcome.
Imagine you're renovating a house. Some of your budget can be used to add a new room, but if you damage the roof first, much of that money has to be spent repairing what was damaged in the process.
Training works in a similar way. When a workout creates enough tension with manageable damage, more of the recovery process can be directed toward building additional muscle. When it causes excessive damage, the body has to spend more time and resources repairing what was already there.
This is why soreness isn't proof that a workout was productive. A little soreness is normal, especially after unfamiliar exercises, but feeling destroyed doesn't mean the muscle received a better growth stimulus.
The same principle applies to exhaustion. Training close to failure can be useful because the final and most challenging repetitions often create the greatest amount of tension in the muscle fibers. But that doesn't mean every set needs to continue until the weight physically stops moving.
Once the target muscle is working hard and the repetitions have slowed down, much of the useful growth stimulus may already be present. Continuing beyond that point can add more fatigue and muscle damage without adding the same amount of benefit.
The goal is to get close enough to failure that the set becomes challenging, while stopping before the cost begins to rise faster than the reward. For most exercises, leaving 1-3 good reps in reserve is enough to create a strong stimulus while making recovery easier.
This becomes especially important because strength can improve faster than training tolerance.
Someone can become capable of lifting heavier weights before their body is ready to handle much more total training. Their technique improves. Their confidence grows. Their nervous system becomes better at recruiting muscle. These changes can increase performance quickly.
However, the structures and systems that support repeated training may take longer to adapt. Muscles, tendons, connective tissue, energy systems, and recovery capacity all need time to become more tolerant of heavier loads and greater volume.
This creates a common mistake. A lifter adds weight and sets simply because they are capable of completing them. Their strength may be improving, but the amount of stress they can recover from hasn't increased at the same rate.
Good training therefore requires more than asking, “Could I finish the workout?” A better question is, "Could I complete the workout, recover from it, and return ready to perform at a greater capacity next time?"
Signs that the training dose is appropriate include stable or improving strength, manageable soreness, consistent technique, and the ability to repeat the workload without a continued decline in performance. Over time, that same workload should become easier to tolerate, or the lifter should be able to perform slightly more without creating a disproportionate increase in fatigue.
If you can survive the session but spend the rest of the week trying to recover from it, the workout may be creating more disruption than your body can productively adapt to. Being strong enough to complete the work is only part of the equation. Strength is the ability to produce force, while training tolerance is the ability to handle that force repeatedly, recover from the stress it creates, and return better prepared for the next session.
Reimagining the Meaning of Health
When people talk about health, they often assume it's a straightforward and easily definable concept: either you're healthy or you're not. But the moment you try to explain what health actually is, the idea becomes much less clear. Is it how you feel? Is it how your body performs? Or is it something broader that includes how you live, think, and function in the world?
There is a recognized field called the philosophy of medicine, or the philosophy of health and disease, but there isn't one dominant, universally accepted philosophy of health in the same way there are recognizable schools like Stoicism, utilitarianism, existentialism, or pragmatism. The closest thing we have to an official global definition comes from the World Health Organization, which defines health as “a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.”
The WHO definition falls short as a complete philosophy of health and instead acts more like an ideal. It says health is more than “not being sick,” which is important, but it doesn't fully explain how a person should live, what tradeoffs matter, what the body is for, how much responsibility belongs to the individual versus society, or how to judge health when someone has pain, disability, disease, aging, trauma, or chronic stress.
A better way to frame it is this: there are many different ways to think about health, but no single definition or perspective fully captures what it means in practice.
The main reason is that health sits between biology, morality, culture, medicine, politics, economics, and personal meaning. It isn't purely objective, nor is it purely subjective. A blood marker can be objectively abnormal, but whether someone is healthy cannot always be reduced to that marker. A person can have perfect labs and still be miserable, addicted, socially isolated, weak, anxious, and unable to function. Another person can have a chronic condition but live with strength, purpose, connection, resilience, and high function.
This is why philosophers and physicians distinguish between disease, illness, and sickness. Disease can refer to biological dysfunction, illness to the lived experience of being unwell, and sickness to the social role or recognition of being unwell. Those categories overlap, but they are not identical. Someone can have disease without feeling ill. Someone can feel ill before a diagnosis appears. Someone can be treated socially as sick even when their deeper problem is environmental, psychological, relational, or behavioral.
The major split is usually between two views.
One view is the biological view. In this view, health means normal biological functioning. This is associated with thinkers like Christopher Boorse, who treated health as a theoretical biological concept. The strength of this view is that it keeps health grounded in physiology instead of preference, ideology, or vague wellness language. The weakness is that normal function doesn't fully capture pain, meaning, adaptation, environment, social conditions, or human flourishing. You could describe this view as functional, in the sense that it focuses on whether the system is operating as it is supposed to.
This view becomes more complicated when applied to aging, disability, or chronic conditions. If health is defined only by normal biological functioning, then many predictable features of aging or disability can be treated as straightforward defects. But that misses something important: a person may have limitations, adaptations, or medical realities and still possess a high degree of health in the lived sense if they can function, adapt, participate, and pursue a meaningful life.
The other view is the holistic view. In this view, health is about the person’s ability to live well, pursue meaningful goals, participate in life, and adapt to challenges. This includes thinkers like Georges Canguilhem and Lennart Nordenfelt, and it fits better with real life because health isn't only about whether the organism is working, it's also about whether the person can function in the world they inhabit. A useful parallel term here is integrative or adaptive, since this view looks at how different factors come together and balance to make health possible, rather than focusing only on isolated biological function.
That is why more recent definitions have moved toward health as adaptability. A widely cited proposal in the British Medical Journal defines health as “the ability to adapt and to self-manage” in the face of physical, social, and emotional challenges. That gets closer because health isn't a perfect static state — it's dynamic, requiring the capacity to respond.
So if we had to build a generally recognized philosophy of health from the broad consensus, it would probably be something like this:
Health is the cultivated capacity to function, adapt, and pursue a meaningful life through the integration of body, mind, behavior, environment, and community.
Or put more simply: Health is the capacity to live well in reality.
It's not endless optimization, perfect biomarkers, visible leanness, or total control. It also isn't static or universally experienced in the same way across all people, stages of life, or environments. A real philosophy of health would probably rest on a few core principles that account for both its biological realities and its lived complexity.
First, health is functional. The body should support life, not become the entire purpose of life. Strength, mobility, energy, sleep, digestion, cognition, and emotional regulation matter because they increase someone’s ability to act.
Second, health is adaptive. A healthy person is not someone who never experiences stress, illness, pain, or disorder. A healthy system can respond, recover, reorganize, and continue functioning. This is why the ability to adapt and self-manage is such a useful model.
Third, health is multidimensional. Physical, mental, social, and environmental health cannot be fully separated. The WHO definition gets this part right by refusing to define health as merely the absence of disease.
Fourth, health is both personal and collective. Individuals have responsibility for their habits, but people do not choose all of their conditions. Food access, income, stress exposure, education, neighborhood safety, healthcare access, and culture shape health. One criticism of the self-management model is that it can accidentally blame people who have fewer resources or lower capacity to adapt.
Fifth, health isn't the same as morality. Being healthy doesn't make someone virtuous, and being sick doesn’t make someone a failure. This matters because modern wellness culture often turns health into a moral hierarchy.
Sixth, health exists to support a good and meaningful life. The purpose of health is to expand what life allows: to love, work, think, create, endure, contribute, enjoy, and participate.
Part of what makes a philosophy of health so difficult is that health is too broad to belong to one discipline. Medicine wants diagnosis. Biology wants function. Public health wants population outcomes. Psychology wants resilience and behavior. Philosophy wants meaning and value. Fitness wants performance and body composition. Spiritual traditions often want wholeness, discipline, or harmony.
But the closest modern synthesis would be this:
Health centers on capacity rather than perfection. It reflects a person’s ability to meet life with enough physical function, mental clarity, emotional resilience, social connection, and environmental support to pursue a meaningful existence.
That is the most defensible starting point for a philosophy of health, but it still feels incomplete on its own. A philosophy of health cannot stop at defining what health is in theory; it also has to extend into practice. It needs to account for how health is actually built over time, how it's maintained, how it breaks down, and how it can be restored when it is lost.
Health, to me, isn't just the absence of disease, and it isn't something that can be fully understood through lab numbers, body fat percentage, or appearance alone. It is a state of bodily function, movement quality, emotional steadiness, and physiological resilience that gives a person the freedom, confidence, and capacity to live the life they want.
Someone can look fit and still be unwell. Someone can have impressive numbers and still lack energy, stability, strength, clarity, or peace. Real health is when the body works well, adapts well, and supports a high quality of life without constant limitation, discomfort, or dependency.
This is where my view becomes more specific. I believe health is built by living in alignment with what human beings fundamentally need. That includes movement, sunlight, connection, quality food, sleep, stress management, purpose, time in nature, and daily habits that work with our biology rather than against it.
I don't see the body as a machine that simply needs to be medicated whenever symptoms appear. I see it as a living system that needs to be understood, supported, and respected. Symptoms are not random inconveniences to suppress. They are often signals that something deeper may be out of order. That does not mean medicine has no place. It means medicine should not be the only lens. Real health, in my view, comes from addressing causes rather than only managing consequences.
This also means that health cannot be separated from behavior. The body is shaped by what it repeatedly experiences. The food someone eats, the way they move, the sleep they get, the stress they carry, the relationships they maintain, the light they see, the environments they inhabit, and the standards they live by all become information to the body. Over time, those repeated inputs either support function or erode it.
That is why I do not view health as a temporary intervention or a short-term fix. I see it as a way of living. It is built through sustainable habits, standards, and identity, not through quick fixes or temporary bursts of motivation. A diet only matters if it can actually be lived. A training plan only matters if it can be recovered from and repeated over time. A strategy only matters if it helps someone become the kind of person who can carry it forward.
Therefore, health is not just about what a person does once in a while. It is about what they repeatedly choose, what they value, and who they're becoming.
But health should also lead somewhere. It is not the final goal in itself. It is the foundation that gives a person the ability to act, choose, lead, and live with greater purpose. Good health allows someone to be more present, more capable, and more fully themselves. That is part of why confidence in one’s body matters. It reflects freedom, self-respect, and the ability to move through life with strength and agency.
In this sense, health is both biological and philosophical. It is biological because the body has real needs, real limits, and real consequences when those needs are ignored. But it is philosophical because the point of health is not merely to survive, optimize, or avoid disease. The point is to create the capacity for a fuller life.
Health is not perfection. It isn't a number, a look, a supplement stack, or a temporary state of discipline. Health is the cultivated capacity to live well in reality. It is the condition of the body and mind that allows a person to meet life with strength, adaptability, clarity, and purpose.
And if there is a philosophy of health worth building around, I think it's this:
The body is not the destination. It is the foundation. Health is the practice of building that foundation well enough that life can be lived with more freedom, presence, and meaning.
When people talk about health, they often assume it's a straightforward and easily definable concept: either you're healthy or you're not. But the moment you try to explain what health actually is, the idea becomes much less clear. Is it how you feel? Is it how your body performs? Or is it something broader that includes how you live, think, and function in the world?
There is a recognized field called the philosophy of medicine, or the philosophy of health and disease, but there isn't one dominant, universally accepted philosophy of health in the same way there are recognizable schools like Stoicism, utilitarianism, existentialism, or pragmatism. The closest thing we have to an official global definition comes from the World Health Organization, which defines health as “a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity.”
The WHO definition falls short as a complete philosophy of health and instead acts more like an ideal. It says health is more than “not being sick,” which is important, but it doesn't fully explain how a person should live, what tradeoffs matter, what the body is for, how much responsibility belongs to the individual versus society, or how to judge health when someone has pain, disability, disease, aging, trauma, or chronic stress.
A better way to frame it is this: there are many different ways to think about health, but no single definition or perspective fully captures what it means in practice.
The main reason is that health sits between biology, morality, culture, medicine, politics, economics, and personal meaning. It isn't purely objective, nor is it purely subjective. A blood marker can be objectively abnormal, but whether someone is healthy cannot always be reduced to that marker. A person can have perfect labs and still be miserable, addicted, socially isolated, weak, anxious, and unable to function. Another person can have a chronic condition but live with strength, purpose, connection, resilience, and high function.
This is why philosophers and physicians distinguish between disease, illness, and sickness. Disease can refer to biological dysfunction, illness to the lived experience of being unwell, and sickness to the social role or recognition of being unwell. Those categories overlap, but they are not identical. Someone can have disease without feeling ill. Someone can feel ill before a diagnosis appears. Someone can be treated socially as sick even when their deeper problem is environmental, psychological, relational, or behavioral.
The major split is usually between two views.
One view is the biological view. In this view, health means normal biological functioning. This is associated with thinkers like Christopher Boorse, who treated health as a theoretical biological concept. The strength of this view is that it keeps health grounded in physiology instead of preference, ideology, or vague wellness language. The weakness is that normal function doesn't fully capture pain, meaning, adaptation, environment, social conditions, or human flourishing. You could describe this view as functional, in the sense that it focuses on whether the system is operating as it is supposed to.
This view becomes more complicated when applied to aging, disability, or chronic conditions. If health is defined only by normal biological functioning, then many predictable features of aging or disability can be treated as straightforward defects. But that misses something important: a person may have limitations, adaptations, or medical realities and still possess a high degree of health in the lived sense if they can function, adapt, participate, and pursue a meaningful life.
The other view is the holistic view. In this view, health is about the person’s ability to live well, pursue meaningful goals, participate in life, and adapt to challenges. This includes thinkers like Georges Canguilhem and Lennart Nordenfelt, and it fits better with real life because health isn't only about whether the organism is working, it's also about whether the person can function in the world they inhabit. A useful parallel term here is integrative or adaptive, since this view looks at how different factors come together and balance to make health possible, rather than focusing only on isolated biological function.
That is why more recent definitions have moved toward health as adaptability. A widely cited proposal in the British Medical Journal defines health as “the ability to adapt and to self-manage” in the face of physical, social, and emotional challenges. That gets closer because health isn't a perfect static state — it's dynamic, requiring the capacity to respond.
So if we had to build a generally recognized philosophy of health from the broad consensus, it would probably be something like this:
Health is the cultivated capacity to function, adapt, and pursue a meaningful life through the integration of body, mind, behavior, environment, and community.
Or put more simply: Health is the capacity to live well in reality.
It's not endless optimization, perfect biomarkers, visible leanness, or total control. It also isn't static or universally experienced in the same way across all people, stages of life, or environments. A real philosophy of health would probably rest on a few core principles that account for both its biological realities and its lived complexity.
First, health is functional. The body should support life, not become the entire purpose of life. Strength, mobility, energy, sleep, digestion, cognition, and emotional regulation matter because they increase someone’s ability to act.
Second, health is adaptive. A healthy person is not someone who never experiences stress, illness, pain, or disorder. A healthy system can respond, recover, reorganize, and continue functioning. This is why the ability to adapt and self-manage is such a useful model.
Third, health is multidimensional. Physical, mental, social, and environmental health cannot be fully separated. The WHO definition gets this part right by refusing to define health as merely the absence of disease.
Fourth, health is both personal and collective. Individuals have responsibility for their habits, but people do not choose all of their conditions. Food access, income, stress exposure, education, neighborhood safety, healthcare access, and culture shape health. One criticism of the self-management model is that it can accidentally blame people who have fewer resources or lower capacity to adapt.
Fifth, health isn't the same as morality. Being healthy doesn't make someone virtuous, and being sick doesn’t make someone a failure. This matters because modern wellness culture often turns health into a moral hierarchy.
Sixth, health exists to support a good and meaningful life. The purpose of health is to expand what life allows: to love, work, think, create, endure, contribute, enjoy, and participate.
Part of what makes a philosophy of health so difficult is that health is too broad to belong to one discipline. Medicine wants diagnosis. Biology wants function. Public health wants population outcomes. Psychology wants resilience and behavior. Philosophy wants meaning and value. Fitness wants performance and body composition. Spiritual traditions often want wholeness, discipline, or harmony.
But the closest modern synthesis would be this:
Health centers on capacity rather than perfection. It reflects a person’s ability to meet life with enough physical function, mental clarity, emotional resilience, social connection, and environmental support to pursue a meaningful existence.
That is the most defensible starting point for a philosophy of health, but it still feels incomplete on its own. A philosophy of health cannot stop at defining what health is in theory; it also has to extend into practice. It needs to account for how health is actually built over time, how it's maintained, how it breaks down, and how it can be restored when it is lost.
Health, to me, isn't just the absence of disease, and it isn't something that can be fully understood through lab numbers, body fat percentage, or appearance alone. It is a state of bodily function, movement quality, emotional steadiness, and physiological resilience that gives a person the freedom, confidence, and capacity to live the life they want.
Someone can look fit and still be unwell. Someone can have impressive numbers and still lack energy, stability, strength, clarity, or peace. Real health is when the body works well, adapts well, and supports a high quality of life without constant limitation, discomfort, or dependency.
This is where my view becomes more specific. I believe health is built by living in alignment with what human beings fundamentally need. That includes movement, sunlight, connection, quality food, sleep, stress management, purpose, time in nature, and daily habits that work with our biology rather than against it.
I don't see the body as a machine that simply needs to be medicated whenever symptoms appear. I see it as a living system that needs to be understood, supported, and respected. Symptoms are not random inconveniences to suppress. They are often signals that something deeper may be out of order. That does not mean medicine has no place. It means medicine should not be the only lens. Real health, in my view, comes from addressing causes rather than only managing consequences.
This also means that health cannot be separated from behavior. The body is shaped by what it repeatedly experiences. The food someone eats, the way they move, the sleep they get, the stress they carry, the relationships they maintain, the light they see, the environments they inhabit, and the standards they live by all become information to the body. Over time, those repeated inputs either support function or erode it.
That is why I do not view health as a temporary intervention or a short-term fix. I see it as a way of living. It is built through sustainable habits, standards, and identity, not through quick fixes or temporary bursts of motivation. A diet only matters if it can actually be lived. A training plan only matters if it can be recovered from and repeated over time. A strategy only matters if it helps someone become the kind of person who can carry it forward.
Therefore, health is not just about what a person does once in a while. It is about what they repeatedly choose, what they value, and who they're becoming.
But health should also lead somewhere. It is not the final goal in itself. It is the foundation that gives a person the ability to act, choose, lead, and live with greater purpose. Good health allows someone to be more present, more capable, and more fully themselves. That is part of why confidence in one’s body matters. It reflects freedom, self-respect, and the ability to move through life with strength and agency.
In this sense, health is both biological and philosophical. It is biological because the body has real needs, real limits, and real consequences when those needs are ignored. But it is philosophical because the point of health is not merely to survive, optimize, or avoid disease. The point is to create the capacity for a fuller life.
Health is not perfection. It isn't a number, a look, a supplement stack, or a temporary state of discipline. Health is the cultivated capacity to live well in reality. It is the condition of the body and mind that allows a person to meet life with strength, adaptability, clarity, and purpose.
And if there is a philosophy of health worth building around, I think it's this:
The body is not the destination. It is the foundation. Health is the practice of building that foundation well enough that life can be lived with more freedom, presence, and meaning.
Why the New Resistance Training Guidelines Feel Both Important and Underwhelming
The American College of Sports Medicine (ACSM) recently released an updated position stand on resistance training for healthy adults. A position stand is essentially an official summary of the current evidence that organizations use to guide recommendations for practitioners, coaches, and the general public. This update revisits and expands on ACSM's 2009 guidance by synthesizing a large body of research on how different training variables affect outcomes like strength, muscle growth, power, and physical function.
When I first saw people discussing the update, I expected the conclusions to feel more surprising. Instead, a lot of them sounded like things many evidence-informed coaches already accept. You do not need to train to failure every set. Muscle can grow across a wide range of loads. Frequency is mostly a way to distribute weekly volume. Machines and free weights can both be useful. Periodization is not automatically superior for every lifter in every situation.
My first reaction was not disagreement as much as confusion. Why was this being treated like big news?
The answer, I think, is that the update is less revolutionary as an advanced coaching document and more important as an institutional correction. It moves resistance-training guidance away from rigid prescriptions and toward a more flexible understanding of what actually drives adaptation.
In other words, the big shift is not that the old methods stopped working. It is that many of the old rules should no longer be treated as universal requirements.
What the Paper Actually Did
The American College of Sports Medicine released an updated position stand on resistance-training prescription for healthy adults. This paper updates their 2009 position by summarizing a large body of research on how different resistance-training variables affect strength, hypertrophy, power, muscular endurance, and physical function.
This was not one new training study. It was an overview of reviews, meaning the authors looked at existing systematic reviews and meta-analyses to determine what the broader literature says about resistance training.
That distinction matters because the paper is not trying to answer the same question a coach might ask when writing a program for an advanced lifter or athlete.
The paper is asking a broad question:
What resistance-training variables consistently improve outcomes across healthy adults?
A coach is often asking a more specific question:
What does this individual need, at this stage of development, with this goal, this recovery capacity, this training history, and this timeline?
Both questions are useful, but they are not the same question. That is part of why the conclusions can feel both important and underwhelming at the same time.
The Big Shift: From Rules to Ranges
Resistance training has traditionally been taught through very specific rules.
Train each muscle two or three times per week. Use a certain repetition range. Rest a certain amount of time. Progressively overload the movement. Periodize the program. Use enough volume. Train through a full range of motion. Choose the right exercises. Follow the right structure.
None of those recommendations are inherently bad. In many cases, they are useful. The problem is that useful recommendations often become universal laws.
The new position stand seems to challenge that way of thinking.
It does not say that programming variables are meaningless. It says that many resistance-training approaches can improve muscle, strength, and function when compared with doing nothing. Once training is hard enough, consistent enough, and organized around the goal, fewer variables appear to have one universally superior setting.
That is the difference between saying:
“This is a useful way to train.”
And saying:
“This is the only correct way to train.”
The first statement may be true. The second is much harder to defend.
Effective Is Not the Same as Optimal
One of the most important distinctions in the paper is the difference between training that is effective and training that is optimal for a specific outcome.
For general health and function, many forms of resistance training work. Free weights, machines, elastic bands, bodyweight exercises, circuit training, home-based training, and other approaches can all produce meaningful improvements if they are performed consistently and with enough effort.
That does not mean every program is equally good for every goal.
If the goal is maximal strength, heavier loading becomes more important because strength is highly specific to producing force against heavy loads. If the goal is hypertrophy, weekly volume and sufficient effort appear more important than forcing one exact repetition range or training frequency. If the goal is power, the program needs to include faster, more explosive intent rather than only slow, grinding repetitions.
This is where the paper can be misread.
It is not saying the details do not matter. It is saying the details matter most when they are attached to a specific outcome.
A beginner trying to become healthier and stronger does not need the same level of programming precision as an advanced lifter trying to peak a competition lift, bring up a weak muscle group, or manage fatigue across a long training cycle.
The Traditional Rules That Became Tools
The most useful way to understand the update is this:
A lot of traditional resistance-training rules should now be viewed as tools.
Frequency is not magic. It is a tool for distributing weekly volume and managing session quality.
Failure is not mandatory. It is a tool for measuring and applying effort.
Tempo is not a secret hypertrophy mechanism. It is a tool for controlling execution, reducing momentum, and keeping tension where you want it.
Exercise selection is not about choosing universally superior movements. It is a tool for directing stress toward the tissues and skills you are trying to improve.
Rest periods are not inherently anabolic or non-anabolic. They are a tool for controlling performance, fatigue, density, and training quality.
Machines and free weights are not moral categories. They are tools that load the body differently and should be chosen based on the goal, the person, and the context.
Periodization is not a magic ingredient. It is a tool for organizing training stress over time.
This does not make the variables unimportant. It makes them conditional.
The question is not, “What is the rule?”
The better question is, “What problem is this variable solving?”
Why the Periodization Finding Feels Strange
The periodization conclusion is probably one of the easiest parts of the paper to misunderstand.
At first glance, it can sound like the authors are saying periodization does not matter. That can feel wrong to anyone who has trained or coached beyond the beginner stage.
But the better interpretation is more specific.
The paper does not show that planning training over time is useless. It shows that formal periodized programs have not consistently outperformed nonperiodized programs for broad strength and hypertrophy outcomes across the available reviews.
That makes more sense when you consider who is often included in resistance-training research.
Many studies involve untrained or minimally trained participants. For those people, almost any sensible resistance-training program can work. A novice can gain strength from improved coordination, better movement skill, increased confidence, and simply being exposed to loading for the first time. Their threshold for adaptation is low.
In that context, a basic program can produce similar short-term progress to a more formally periodized program.
But that does not mean periodization has no value for people with a higher training age or athletic aspirations.
As someone becomes more advanced, the training problem changes. The issue is no longer just getting exposed to resistance training. The issue becomes continuing to create a stimulus while managing fatigue, joint stress, performance demands, skill practice, recovery, and long-term progression.
That is where periodization still matters.
It can help organize volume, intensity, exercise selection, specificity, variation, and recovery across time. It can help an athlete shift from general preparation to more specific performance. It can help someone emphasize hypertrophy in one phase, strength in another, and peaking in another. It can help manage competing qualities that cannot all be maximally trained at once.
So the takeaway should not be:
“You do not need periodization.”
The better takeaway is:
“Not everyone needs formal periodization to make progress, especially beginners. But advanced lifters and athletes often need some form of organized training structure because their problems are more complex.”
Periodization may not be a direct driver of adaptation by itself. It is a way of organizing the variables that drive adaptation.
Why This Feels Underwhelming
If you already follow modern hypertrophy and strength research, a lot of the paper may feel familiar.
It is already fairly well accepted that hypertrophy can occur across a wide range of loads if sets are taken close enough to failure. It is already common to say that failure is not required on every set. It is already known that frequency is often a way to distribute volume rather than an independent growth trigger. It is already accepted by many coaches that machines can be excellent tools, especially for hypertrophy. It is already reasonable to say that beginners do not need complex periodized programs.
So why does the update matter?
It matters because official guidelines tend to lag behind what experienced coaches and researchers are already discussing. The position stand is not necessarily introducing a brand-new way to train. It is updating the official language around training.
That is still important.
Many people still believe resistance training must follow a narrow template to count. They think they need the perfect split, the perfect rep range, the perfect exercise selection, the perfect progression model, or the perfect periodized plan before they can start.
This paper pushes back against that.
For the general population, the most important message is that resistance training is more flexible than many people think. You do not need to train like a bodybuilder, powerlifter, or athlete to receive meaningful benefits. You need a sustainable way to challenge your muscles consistently.
That is not underwhelming for the person who has been intimidated by the weight room for years.
What This Means for Beginners
For beginners, the message is simple.
Start.
Do not wait until you understand every training variable. Do not wait until you know the perfect split. Do not obsess over whether you should use machines or free weights. Do not worry about whether your program is formally periodized.
Train the major muscle groups. Use exercises you can perform safely and consistently. Work hard enough that the sets are challenging. Add weight, repetitions, sets, or control over time when appropriate. Recover well enough to repeat the process.
For a beginner, consistency matters more than complexity.
A simple program done consistently will outperform a sophisticated program that someone cannot understand, recover from, or maintain.
What This Means for More Advanced Lifters
For advanced lifters, the message is different.
This paper should not be used as an excuse to abandon structure. The fact that many variables do not show universal superiority across broad research does not mean they are irrelevant in advanced training.
As training age increases, the margin for progress becomes smaller. The workload required to create adaptation often becomes higher, while the cost of that workload also increases. Fatigue becomes more meaningful. Exercise selection becomes more specific. Recovery becomes more limiting. Weak points become harder to address. Performance goals become more precise.
At that point, programming variables matter because they solve specific problems.
Frequency may be adjusted to distribute volume more effectively.
Exercise selection may be used to bias a lagging muscle or reduce joint stress.
Failure may be used sparingly to increase stimulus without overwhelming recovery.
Volume may be cycled to manage fatigue.
Intensity may be emphasized when strength expression becomes the priority.
Periodization may be used to organize all of those variables across time.
For advanced trainees, the lesson is not that programming matters less. It is that programming should be justified by the goal rather than inherited as dogma.
What This Means for Coaches
For coaches, the update is a reminder to be more precise with language.
There is a difference between saying:
“I like this approach.”
“This approach works well for this person.”
“This is useful for this goal.”
And:
“Everyone needs to train this way.”
A lot of coaching errors come from turning useful tools into universal rules.
A coach should be able to explain why a variable is being used. Why this frequency? Why this exercise? Why this rep range? Why this rest period? Why this phase? Why this progression model?
If the only answer is, “Because that is what a good program is supposed to include,” the reasoning probably needs to be sharpened.
The value of coaching is not just knowing the variables. It is knowing when each variable matters, when it does not, and how to apply it to the person in front of you.
The Real Takeaway
The new ACSM position stand does not mean programming no longer matters.
It means the field is becoming more careful about which programming rules are truly universal and which are context-dependent.
For the general population, the most important message is that resistance training works across a wide range of approaches. You do not need a perfect program to begin. You need a repeatable one.
For beginners, that should be freeing.
For coaches, it should be humbling.
For advanced lifters and athletes, it should not be misread as a dismissal of structure. The more specific the goal and the more trained the person, the more important it becomes to organize training intelligently.
The real update is not that resistance training has changed.
The update is that the rules have become less rigid.
Many of the things we once treated as requirements are better understood as tools. Their value depends on who is training, what they are training for, and what problem the program is trying to solve.
The Toxic Burden We Pass Down
Toxic exposure is usually discussed as an individual issue. A person is exposed to a chemical, heavy metal, pollutant, or environmental stressor, and the concern is how that exposure affects their health.
But the deeper concern is that toxic exposure may not stop with the individual.
The amount of a toxin a person is exposed to at any point in their lifetime may influence future generations through epigenetic changes. This does not necessarily refer only to a person’s present toxic load, or total body burden. The concern is that exposure itself may leave biological information that can be passed forward through the epigenetic code.
Epigenetics refers to changes in how genes are expressed. It does not change the underlying DNA sequence, but it can influence which genes are turned on or off, and how strongly those genes behave. In this way, the environment can affect biology in ways that may extend beyond one lifetime.
That means a toxin may not only affect the person directly exposed to it. It may also affect their children, grandchildren, and future descendants.
The concerning part is that future generations may not simply inherit the same level of vulnerability. They may become more sensitive to the same exposure.
For example, scientists have found that when the first generation of frogs is exposed to a given amount of mercury, they display a certain level of injury or mutation. But the damage caused by that same amount of heavy metal doubles in the second generation and doubles again in the third generation, until none of them survive.
Instead of gaining tolerance, which can happen in some biological processes, they developed a dramatically greater intolerance with each generation.
That matters because it challenges the way we usually think about adaptation. We often assume that repeated exposure might make an organism stronger or more capable of handling the stressor. But with certain toxins, the opposite may happen. The exposure may alter gene expression in a way that increases vulnerability rather than resilience.
This is the idea of generational body burden.
A toxic exposure may affect the parent, but it may also change how future generations respond to environmental threats. The same amount of toxin may cause more harm later because the inherited epigenetic pattern has made the organism less capable of tolerating it.
That increased sensitivity can make future generations weaker in several ways. They may have a harder time fighting off environmental threats. They may struggle more to recover from health challenges. They may also have a reduced ability to normalize or compensate for genetic defects.
This does not mean every exposure automatically creates permanent damage in every descendant. It does mean that toxic exposure should be taken more seriously than a single-lifetime model allows.
The body is not isolated from ancestry. Health is shaped by the environments we live in, but also by the biological history passed down to us. The exposures of previous generations may influence how resilient or vulnerable the next generation becomes.
This also means that reducing toxic exposure matters beyond personal health. The choices we make around food, water, chemicals, heavy metals, air quality, personal care products, and environmental burden may influence more than our own biology.
They may shape the biological starting point of the people who come after us.
That is why detoxification and toxic load should not be treated as trendy wellness language. The body carries information from its environment. Some of that information may be passed forward. If toxic exposure can influence gene expression across generations, then lowering exposure becomes part of a larger responsibility.
We are not only managing our own body burden.
We may also be influencing the burden inherited by future generations.
What You Put on Your Skin Still Enters Your Body
Most people pay attention to what they eat, drink, and breathe, but they often forget that the skin is also an entry point into the body.
When you put chemicals, makeup, skincare products, oils, soaps, hair products, or other substances on your skin, some of those compounds can be absorbed through the skin and enter circulation. This is one reason personal care products deserve more attention than they usually get.
A simple example often used to explain this is a garlic poultice. A poultice is a soft, moist mass of some substance applied to the body for a medicinal purpose and kept in place with a wrap of cloth or plastic. If garlic is applied to a baby’s feet as a poultice, it has been said that the smell can appear on the breath shortly after. Whether or not that example is precise in every case, the larger point is that substances placed on the skin can influence the body beyond the surface.
Medical science already understands this principle. Transdermal medications have been used for decades. Medicinal patches are applied to the skin when oral delivery is not ideal, when absorption through the digestive tract is poor, or when a steady delivery of medication is preferred.
That alone should change the way we think about skincare and personal care products.
The skin is not an impenetrable wall. It is a living, responsive barrier. It protects the body, but it can also absorb certain substances. The degree of absorption depends on the compound, the condition of the skin, the area of application, the amount used, and how often it is applied.
What makes skin absorption especially important is that substances absorbed through the skin do not go through the liver first in the same way swallowed substances do. When you eat or drink something, it generally passes through the digestive system and then through the liver before reaching the wider bloodstream. This is part of what is called first-pass metabolism.
When something is absorbed through the skin, it can enter circulation more directly, do what it is going to do, and then be filtered by the liver later.
That matters because personal care products are not occasional exposures for most people. They are daily exposures. Makeup, lotions, sunscreen, deodorant, shampoo, conditioner, soap, fragrance, shaving products, and skincare formulas can create repeated contact with chemical compounds over time.
The concern is not that every product is automatically dangerous. The concern is that most people use these products casually without thinking of them as part of their total toxic load.
If something is applied to the skin once, the exposure may be small. But if multiple products are used every day for years, the cumulative exposure becomes more relevant. The body has to process what it absorbs.
This is why personal care products should be treated with the same level of awareness as food. The skin may be external, but what you place on it does not necessarily stay external.
A better approach is to simplify where possible. Use fewer products. Choose cleaner formulas when you can. Avoid unnecessary fragrance. Pay attention to ingredients. Remember that the body is exposed not only through food and air, but also through the products used on the skin every day.
Your skin protects you, but it also connects you to the environment.
That means what you put on your body still matters to what happens inside your body.
Why High-Glycemic Post-Workout Meals May Work Against Muscle Growth
Glycemic load is a term used to describe the effect a food has on blood sugar. The higher the glycemic load, the more that food raises blood sugar and insulin.
Over the years, there has been growing public awareness around glycemic load and how it affects health. More people understand that certain foods spike blood sugar more aggressively than others, and that repeated blood sugar and insulin spikes can affect metabolism over time.
However, this topic is still widely misunderstood, especially in sports nutrition.
One of the most common assumptions is that high-glycemic protein meals promote muscle gain. Many commercial protein products are packed with sugar and marketed around the idea that deliberately spiking insulin after training will help drive more nutrients into muscle and produce better growth.
The logic sounds simple. Insulin is an anabolic hormone, so if you spike insulin after training, it should increase protein deposition in the muscle and improve muscle gain.
That is the idea.
But that is not necessarily what happens in real life.
In real life, high-glycemic protein meals may be counterproductive for muscle. There are two main reasons why.
First, exercise causes a temporary disruption in glucose utilization in the muscle. This is related to muscle microtrauma, or the wear and tear that occurs in muscle tissue during training. Immediately after exercise, the muscle may not tolerate a high-glycemic meal as well as people assume.
The post-workout window is often described as a time when the body can handle anything because the muscles are “primed” for nutrients. But that idea may be too simplistic. Training creates demand, but it also creates stress. The body still needs to manage inflammation, tissue damage, glucose handling, and recovery.
Second, high-glycemic meals can impair insulin function, disrupt muscle mTOR signaling, and interfere with muscle protein synthesis. mTOR is one of the key biological mechanisms involved in building muscle. If insulin sensitivity is impaired, mTOR cannot be fully activated in the way people want.
This is where the insulin-spike theory starts to fall apart.
Insulin matters, but more insulin is not always better. The goal should not be to constantly force the largest possible insulin response. The goal should be to maintain insulin sensitivity so the body can respond properly to the insulin it produces.
There is a major difference between using insulin effectively and chronically overspiking it.
Chronic intake of high-glycemic meals has been shown to cause hyperinsulinemia, a condition where insulin is repeatedly or chronically elevated. Hyperinsulinemia has been linked to uncontrollable fat gain, damage to insulin receptors, and harm to the muscular system.
That matters because muscle growth does not happen in isolation. It depends on the health of the entire metabolic system. If the diet repeatedly drives excessive insulin responses and worsens insulin sensitivity, the body may become less efficient at using nutrients properly.
In that environment, the same meal that was supposed to help build muscle may contribute to fat gain and metabolic dysfunction instead.
This does not mean carbohydrates are bad. It does not mean insulin is bad. It does not mean post-workout nutrition does not matter. The issue is the assumption that a high-sugar, high-glycemic protein meal is automatically the best way to support muscle growth.
Muscle growth requires training stimulus, adequate protein, enough total calories, recovery, and proper nutrient timing. But none of that requires turning every post-workout meal into a blood sugar spike.
A better approach is to support recovery without overwhelming the body. That means prioritizing high-quality protein, choosing carbohydrates based on the person’s training, goals, and insulin sensitivity, and avoiding the belief that more sugar automatically means more muscle.
The body builds muscle through coordinated signaling, not through brute-force insulin spikes.
High-glycemic post-workout meals may sound effective because they appear to match a simple anabolic story: spike insulin, drive nutrients, build muscle. But the body is more complex than that. If insulin sensitivity is impaired, glucose handling is disrupted, and mTOR signaling is compromised, the strategy can work against the very outcome it is supposed to support.
The goal after training is not simply to raise insulin as high as possible.
The goal is to create the internal conditions that allow the body to recover, repair, and build muscle efficiently.
Glyphosate and the Hidden Cost of Chemical Exposure
Glyphosate is one of the most widely used herbicides in the world, best known as the active ingredient in Roundup. It is often discussed as an agricultural chemical, but the deeper concern is what repeated exposure may be doing inside the human body.
In May 2015, the World Health Organization classified glyphosate as “probably carcinogenic to humans.” This classification was based in part on animal studies showing that glyphosate exposure was associated with tumor growth and higher incidents of cancer.
The WHO investigation also found that glyphosate is probably genotoxic, meaning it may contribute to mutations in DNA. It was also associated with increased oxidative stress, which can trigger inflammation and accelerate biological aging.
That matters because oxidative stress is not a small issue. When the body is exposed to more oxidative stress than it can manage, cells, mitochondria, proteins, and DNA can become damaged. Over time, that kind of stress can contribute to inflammation, tissue dysfunction, and premature decline.
Glyphosate may also interfere with hormone signaling. Research has shown that glyphosate can mimic estrogen, which may help explain why it has been shown to cause human breast cancer cells to grow in vitro.¹
The concern does not stop with glyphosate alone. Roundup itself may be more harmful than glyphosate by itself. Research has found that Roundup is directly toxic to mitochondria, and some research suggests it may be even more toxic to human placental cells than glyphosate alone.² ³
This distinction matters because people are rarely exposed to glyphosate in isolation. They are often exposed to commercial formulations that include glyphosate along with other chemical ingredients. The full formulation may affect the body differently than the active ingredient by itself.
The mitochondrial concern is especially important. Mitochondria are responsible for producing cellular energy. When mitochondria are damaged, the effects can reach far beyond one isolated system. Energy production, inflammation control, detoxification, hormone function, and overall cellular resilience can all be affected.
There is also a more unusual concern involving glycine.
The “gly” in glyphosate refers to glycine, an amino acid that is highly prevalent in collagen, the main structural protein in skin and connective tissue. Chemically, glyphosate is a glycine molecule attached to a methylphosphonyl group.
One proposed concern is that when glyphosate is consumed, it may be incorporated into the collagen matrix in place of glycine. If this occurs, it could interfere with the structure and function of proteins that depend on glycine.
In 2018, researchers Stephanie Seneff and Laura Orlando published a paper proposing that glyphosate substitution for glycine during protein synthesis may disrupt proteins necessary for kidney health and may contribute to kidney disease.⁴
This theory is controversial, but it raises an important question: what happens when a synthetic chemical resembles a biological building block closely enough to interfere with normal function?
That is the larger issue with glyphosate. The concern is not only whether it is acutely toxic. The concern is whether chronic exposure may create subtle biological disruptions over time through oxidative stress, mitochondrial dysfunction, hormone mimicry, DNA damage, protein disruption, and microbiome effects.
Glyphosate is not just a farming issue. It is a human biology issue.
If a chemical can influence mitochondria, oxidative stress, DNA integrity, estrogen signaling, placental cells, collagen structure, and kidney-related proteins, then it deserves more attention than it usually receives.
This does not mean every health problem can be blamed on glyphosate. It does not mean one exposure automatically causes disease. But it does mean glyphosate should not be treated as harmless simply because it is common.
Common exposure is not the same thing as safe exposure.
The body is constantly interacting with the environment. Food, water, air, light, chemicals, stress, and nutrients all become part of the biological context in which health or dysfunction develops. Glyphosate belongs in that conversation because it may interfere with several systems that are essential for long-term health.
The more we understand about chemical exposure, the clearer it becomes that health is not only about what we intentionally put into the body. It is also about what we are exposed to without thinking.
Reducing glyphosate exposure may be one practical step toward lowering the chemical burden placed on the body. That can mean choosing organic foods when possible, washing produce, being mindful of foods most likely to contain herbicide residues, and understanding that the quality of the food supply matters.
Glyphosate may be invisible in the meal, but that does not mean it is irrelevant.
References
Thongprakaisang, Siriporn, et al. “Glyphosate Induces Human Breast Cancer Cells Growth via Estrogen Receptors.” Food and Chemical Toxicology 59, September 2013, 129-136. https://doi.org/10.1016/j.fct.2013.05.057
Peixoto, Francisco. “Comparative Effects of the Roundup and Glyphosate on Mitochondrial Oxidative Phosphorylation.” Chemosphere 61, no. 8, December 2005, 1115-1122. https://doi.org/10.1016/j.chemosphere.2005.03.044
Samsel, Anthony, and Stephanie Seneff. “Glyphosate, Pathways to Modern Diseases IV: Cancer and Related Pathologies.” Journal of Biological Physics and Chemistry 15, 2015, 121-159. https://doi.org/10.4024/11SA15R.jbpc.15.03
Seneff, Stephanie, and Laura F. Orlando. “Glyphosate Substitution for Glycine During Protein Synthesis as a Causal Factor in Mesoamerican Nephropathy.” Journal of Environmental & Analytical Toxicology 8, no. 1, 2018, 541. https://doi.org/10.4172/2161-0525.1000541
Exercise Helps Keep Your Cells Young
Exercise is another important way to help prevent early telomere shortening.
Telomeres are the protective caps on the ends of chromosomes. They are often discussed in relation to aging because, as cells divide over time, telomeres tend to shorten. Shorter telomeres are associated with cellular aging, while longer telomeres are generally considered a marker of better cellular resilience.
Researchers in Germany looked at telomere length in four groups of people: young sedentary individuals, young active individuals, middle-aged sedentary individuals, and middle-aged active individuals.
There was not much of a difference between the two younger groups. Whether the young participants were sedentary or active, their telomere lengths were relatively similar.
But the difference became much more striking in middle age.
The sedentary middle-aged participants had telomeres that were 40 percent shorter than the young participants. The active middle-aged participants had telomeres that were only 10 percent shorter than the young participants.
In other words, the active group reduced their telomere shortening by 75 percent.¹
That is a powerful finding because it suggests that exercise may help slow one of the biological markers associated with aging. The body still ages, but activity appears to change how quickly certain cellular changes occur.
Exercise may influence telomeres through several mechanisms. One of the most important is stress reduction. Exercise has been shown to significantly reduce perceived stress levels, and stress is one of the factors associated with faster biological aging.²
Exercise also helps reduce inflammation, which may help explain its relationship with telomere preservation. Chronic inflammation places ongoing stress on the body. Over time, that stress can contribute to tissue damage, metabolic dysfunction, and accelerated aging.
This gives us a more meaningful way to think about exercise.
Exercise is not just about burning calories, losing weight, or looking better. It is a signal to the body that maintenance still matters. It supports cardiovascular health, muscle function, insulin sensitivity, stress regulation, inflammation control, and cellular resilience.
The German research makes this point clearly. In youth, the difference between active and sedentary people may not always show up dramatically in telomere length. But by middle age, the gap becomes much harder to ignore.
That is how many health habits work. Their benefits may not always be obvious immediately, but over time, the body keeps score.
The active middle-aged group did not avoid aging entirely. Their telomeres were still shorter than those of the younger participants. But the shortening was far less severe than in the sedentary middle-aged group.
That distinction matters.
The goal is not to stop aging. The goal is to slow unnecessary decline. Exercise appears to be one of the clearest tools we have for doing that.
If you want to age well, movement cannot be treated as optional. The body was designed to be used. When it is not used, systems begin to degrade faster than they should. When it is used consistently, the body receives a reason to preserve function.
Exercise helps protect your body from early decline, not only at the level of muscles and lungs, but at the level of the cell.
That may be one of the strongest arguments for making movement a regular part of life.
References
Reynolds, Gretchen. “Phys Ed: How Exercising Keeps Your Cells Young.” New York Times Well, January 27, 2010. https://well.blogs.nytimes.com/2010/01/27/phys-ed-how-exercising-keeps-your-cells-young/?scp=1&sq=how%20exercising%20keeps%20your%20cells%20young&st=cse
Starkweather, Angela R. “The Effects of Exercise on Perceived Stress and IL-6 Levels Among Older Adults.” Biological Research for Nursing 8, no. 3, January 2007, 186-194. https://www.ncbi.nlm.nih.gov/pubmed/17172317
Why Blue Light at Night Is Wrecking Your Sleep
Other than a cup of coffee right before bed, few things are more disruptive to sleep than bright blue or white light in the evening. It can affect your body in several ways, and over time, that disruption may contribute to the aging process.
Blue light is everywhere. We get normal amounts from the sun during the day, but we also get large, unbalanced doses from light-emitting diodes, or LEDs, used in energy-efficient bulbs and the screens on TVs, computers, tablets, and smartphones.
Blue light has a short wavelength, which means it produces more energy than longer-wavelength light frequencies, such as red light. Most people have heard at least some version of this by now, but many still underestimate how much of a problem it can become when the goal is better sleep, better metabolism, and better long-term health.
The data is convincing, and reducing the impact of blue light is easier than most people think.
Blue light is not all bad. Exposure to blue light during the day helps wake you up, makes you more alert, and can even improve mood. White-light and blue-light emitting goggles and panels are used to help treat issues such as seasonal affective disorder, jet lag, and premenstrual syndrome.¹
The problem is timing and dose.
Newer artificial lights, such as LEDs and compact fluorescent light bulbs, do not contain most of the infrared, violet, and red light found in sunlight. Instead, they increase the intensity of blue light to a level that our eyes, brains, and bodies have not evolved to handle, especially after dark.
This is sometimes called “junk light” because, in this view, it can be unhealthy and aging in a way that resembles the effect of junk food. You are exposed to junk light throughout the day and often late into the night, especially when you are on your phone, working at your computer, or watching TV. All of that blue light exposure can interfere with sleep.²
Blue light shifts your circadian rhythm in part by suppressing melatonin, the hormone that helps tell your brain when it is time to sleep. When blue light is present at night, it can trick the body into acting as if it is still daytime.
Normally, the pineal gland, a pea-sized gland in the brain, begins releasing melatonin a couple of hours before bed. But blue light can interfere with this process by stimulating a type of light sensor in the retina called intrinsically photosensitive retinal ganglion cells, or ipRGCs.
These sensors send light information to the circadian clock, helping the body determine when it is time to sleep and wake. This system uses more than melatonin alone, but melatonin is one of the major signals affected by evening light exposure.³
When those light sensors are stimulated by blue light at night, falling asleep becomes harder.
A 2014 study found that people who read from a light-emitting device before bed took longer to fall asleep, slept less deeply, and were more alert than people who read a printed book.⁴ This is one of the clearest practical examples of why screen use before bed can become a problem.
The issue is not only sleep timing. The amount of blue light you are exposed to at night has also been connected to faster aging processes.
The mitochondria in your eyes have to produce more energy than normal to process blue light. When the mitochondria in the eyes are overtaxed, the rest of the body’s mitochondria may be affected as well. This can contribute to metabolic stress and inflammation throughout the body, increasing the risk of premature decline in health.
Blue light at night can also affect glucose regulation.
One study found that adults exposed to blue light while eating in the evening had higher glucose levels, slower metabolisms, and more insulin resistance compared with adults who ate in dim light.⁵ In simple terms, the wrong light at the wrong time may make it harder for the body to regulate blood sugar properly.
That is why evening lighting matters. Using old-school low-watt incandescent bulbs or a dimmer switch to keep light intensity down is a simple way to reduce nighttime light stress. It is also much cheaper than dealing with metabolic disease later.
Artificial light at night may also be connected to cancer risk. People exposed to higher levels of outdoor blue light at night have been found to have a higher risk of breast cancer and prostate cancer compared with people who had less exposure.⁶ Other studies have found that a disrupted circadian clock can increase cancer risk by affecting the body’s response to DNA damage.⁷
Blue light exposure has also been linked to obesity and metabolic disorders, both of which are major risk factors for cardiovascular disease.
The eyes may be especially vulnerable. Blue light can contribute to macular degeneration, which involves damage to the retina and can lead to vision loss.⁸ More than 11 million people over the age of sixty have some form of macular degeneration, making this a significant issue.⁹
The practical takeaway is not that blue light is evil. The sun contains blue light, and blue light during the day can be helpful. The problem is excess blue light at night, especially from screens and artificial lighting that does not match the natural light-dark cycle the body expects.
The body was designed to experience bright natural light during the day and darkness at night. Modern life has reversed much of that pattern. We spend too much of the day indoors under artificial light and too much of the evening staring into bright screens.
Reducing blue light at night does not require a complicated protocol. Start by dimming the lights in the evening. Use warmer, lower-intensity bulbs when possible. Avoid bright overhead lighting late at night. Reduce screen time before bed, or at least use blue-light blocking settings or glasses. Keep your bedroom dark. Treat darkness as part of the sleep environment, not an afterthought.
If sleep matters, light matters.
And if your goal is better energy, better metabolism, better recovery, and better long-term health, then reducing excess blue light at night is one of the simplest places to start.
References
Strong, Robert E., et al. “Narrow-Band Blue-Light Treatment of Seasonal Affective Disorder in Adults and the Influence of Additional Nonseasonal Symptoms.” Depression and Anxiety 26, no. 3, 2009, 273-278. https://doi.org/10.1002/da.20538
Tosini, Gianluca, Ian Ferguson, and Kazuo Tsubota. “Effects of Blue Light on the Circadian System and Eye Physiology.” Molecular Vision 22, January 24, 2016, 61-72. https://www.ncbi.nlm.nih.gov/pubmed/26900325
Chang, Anne-Marie, et al. “Evening Use of Light-Emitting eReaders Negatively Affects Sleep, Circadian Timing, and Next-Morning Alertness.” Proceedings of the National Academy of Sciences of the USA 112, no. 4, January 27, 2015, 1232-1237. https://doi.org/10.1073/pnas.1418490112
Tosini, Ferguson, and Tsubota. “Effects of Blue Light on the Circadian System and Eye Physiology.”
Chang, Anne-Marie, et al. “Evening Use of Light-Emitting eReaders Negatively Affects Sleep, Circadian Timing, and Next-Morning Alertness.”
Spiegel, Karine, et al. “Effects of Poor and Short Sleep on Glucose Metabolism and Obesity Risk.” Nature Reviews Endocrinology 5, no. 5, 2009, 253-261. https://doi.org/10.1038/nrendo.2009.23
Garcia-Saenz, Ariadna, et al. “Evaluating the Association Between Artificial Light-at-Night Exposure and Breast and Prostate Cancer Risk in Spain: MCC-Spain Study.” Environmental Health Perspectives 126, no. 4, April 23, 2018, 047011. https://doi.org/10.1289/EHP1837
Sancar, Aziz, et al. “Circadian Clock Control of the Cellular Response to DNA Damage.” FEBS Letters 584, no. 12, June 18, 2010, 2618-2625. https://doi.org/10.1016/j.febslet.2010.03.017
Tosini, Ferguson, and Tsubota. “Effects of Blue Light on the Circadian System and Eye Physiology.”
BrightFocus Foundation. “Age-Related Macular Degeneration: Facts and Figures.” Last modified January 5, 2016. https://www.brightfocus.org/macular/article/age-related-macular-facts-figures
How Blue Light at Night Affects Blood Sugar
Excess blue light does more than affect sleep. It may also contribute to inflammation and mitochondrial dysfunction, largely because of its impact on glucose control.
This matters because light is not just something we use to see. Light is biological information. The body uses light to help regulate circadian rhythm, hormone timing, metabolism, sleep, and energy production. When the wrong light comes at the wrong time, the body can receive the wrong signal.
Blue light during the day, especially from the sun, can be useful because it helps reinforce wakefulness and circadian timing. But blue light in the evening can create a different effect. Evening exposure to blue light has been shown to influence glucose levels, leading to higher blood sugar and increased insulin resistance.¹
That means your blood sugar may stay higher than it should, while your body becomes less effective at moving that sugar out of the bloodstream.
Insulin resistance is the condition where the body does not respond to insulin as well as it should. Insulin’s job is to help move glucose from the blood into the cells, where it can be used or stored. When insulin sensitivity decreases, blood sugar remains elevated more easily, and the body has to work harder to maintain normal glucose control.
Over time, this can become a problem for metabolic health.
The result is that excessive artificial light at night may increase the risk of weight gain and contribute to the development of type 2 diabetes. Research has also raised the question of whether artificial light at night contributes to the worldwide obesity pandemic.²
This is important because most people think about blue light only through the lens of sleep. They know screens at night may make it harder to fall asleep, but they may not realize that nighttime light exposure can also affect metabolism.
The body expects a rhythm: brighter light during the day and darkness at night. That rhythm helps coordinate the systems that regulate energy, blood sugar, hormones, and cellular function. When artificial light extends the “day” into the evening, the body may continue operating as if it should remain alert and metabolically active.
That mismatch can affect glucose regulation.
If evening blue light causes blood sugar to rise and contributes to insulin resistance, then nighttime screen use, bright indoor lighting, and artificial light exposure may be more significant than people realize. This is especially relevant for people already struggling with weight gain, poor sleep, blood sugar instability, or metabolic dysfunction.
The solution does not need to be complicated. The goal is to respect the body’s natural light-dark cycle.
During the day, get bright natural light. In the evening, dim the lights. Reduce screen exposure close to bed. Use warmer lighting when possible. Avoid bright overhead lights late at night. Give the body a clearer signal that the day is ending.
This is not only about sleeping better. It is about helping the body regulate glucose, insulin, inflammation, and mitochondrial function more appropriately.
Excess blue light at night is a modern problem because the body was not designed for constant artificial brightness. The more we understand light as a biological signal, the more obvious it becomes that darkness matters too.
If we want better sleep, better blood sugar, and better metabolic health, we need to be more careful about the light we expose ourselves to after sunset.
References
Sarode, Bhagyesh R., et al. “Light Control of Insulin Release and Blood Glucose Using an Injectable Photoactivated Depot.” Molecular Pharmacology 13, no. 11, November 7, 2016, 3835-3841. https://doi.org/10.1021/acs.molpharmaceut.6b00633
Paul, Marla. “Exposure to Bright Light May Alter Blood Sugar.” Futurity, May 19, 2016. https://www.futurity.org/bright-light-metabolism-1166262-2/
Rybnikova, Nataliya A., A. Haim, and Boris A. Portnov. “Does Artificial Light-at-Night Exposure Contribute to the Worldwide Obesity Pandemic?” International Journal of Obesity 40, no. 5, May 2016, 815-823. https://doi.org/10.1038/ijo.2015.255
Modified Citrus Pectin and Heavy Metal Detoxification
Modified citrus pectin, often called MCP, is a form of pectin that has been altered so it can be more easily absorbed by the body. It is often discussed for its potential role in detoxification, especially when it comes to helping the body remove certain heavy metals.
One of the reasons MCP is interesting is that it appears to support the urinary excretion of toxic elements. In simple terms, it may help bind or mobilize certain metals so the body can remove more of them through urine.
Modified citrus pectin has been studied for its ability to support the removal of metals such as lead, cadmium, arsenic, and thallium. These metals are concerning because they can accumulate in the body and interfere with normal biological function.
In one study, subjects took about 15 grams of modified citrus pectin powder per day for five days. After using MCP, the subjects passed significantly higher levels of toxic metals through their urine.
Specifically, urinary arsenic excretion increased by 130 percent. Cadmium excretion increased by 150 percent. Lead excretion increased by 560 percent.¹
Those numbers are significant because they suggest MCP may help the body eliminate certain toxic elements without requiring more aggressive interventions.
This does not mean MCP is a cure-all, and it does not mean detoxification should be treated casually. Heavy metal exposure can be serious, and anyone with known or suspected heavy metal toxicity should work with a qualified healthcare professional. But the research does suggest that modified citrus pectin may be a useful tool for supporting the body’s natural elimination pathways.
The larger point is that detoxification is not just a vague wellness idea. The body has real systems for processing and eliminating unwanted compounds. The liver, kidneys, gut, lymphatic system, and urinary system all play important roles. When a compound like MCP appears to increase urinary excretion of toxic metals, it gives us a more concrete way to think about detoxification support.
MCP may be especially relevant because heavy metals are difficult for the body to deal with once they accumulate. Lead, cadmium, arsenic, and thallium are not nutrients the body uses. They are toxic elements that can place stress on biological systems.
Supporting their removal may reduce toxic burden and help the body function better.
Again, the goal is not to turn MCP into a magic supplement. The goal is to understand what the research suggests. In this case, modified citrus pectin appears to increase the urinary excretion of several toxic metals, including arsenic, cadmium, and lead.
That makes it a potentially useful option in the larger conversation around heavy metal detoxification, toxic exposure, and supporting the body’s elimination systems.
Reference
Eliaz, Isaac, et al. “The Effect of Modified Citrus Pectin on Urinary Excretion of Toxic Elements.” Phytotherapy Research 20, no. 10, October 2006, 849-864. https://doi.org/10.1002/ptr.1953
Exercise Keeps You Younger at the Cellular Level
Most people think about exercise in terms of how it changes the body on the outside. They think about weight loss, muscle, strength, endurance, or how they look in the mirror.
But exercise also changes the body on the inside.
Research shows that adults who regularly engage in intense exercise have significantly longer telomeres. Telomeres are the protective caps on the ends of chromosomes. They help protect genetic material as cells divide, and they are often discussed as one marker connected to biological aging.
That matters because telomere length gives us a way to think about aging beyond the number of birthdays someone has had. Two people can be the same chronological age, but their bodies may not be aging at the same rate internally.
In a 2017 study using NHANES data, researcher Larry A. Tucker found that adults who engaged in high levels of physical activity had significantly longer telomeres than those who were less active. According to the research, people who exercised regularly appeared to be a full decade younger than their peers at the cellular level.
That is a powerful idea.
Exercise is not just about burning calories. It is not just about looking better, building muscle, or improving performance. It is one of the most important signals we can send the body if we want to preserve function, resilience, and biological youth.
The body adapts to what we ask of it. When we regularly engage in intense exercise, we are giving the body a reason to maintain itself. We are asking it to preserve muscle, improve cardiovascular function, regulate blood sugar, support mitochondrial health, and keep tissues responsive.
Telomeres are one way to see that the benefits of exercise may reach deep into the biology of aging.
This does not mean exercise makes someone immortal. It does not mean training can stop every part of the aging process. But it does suggest that regular intense physical activity is associated with measurable differences in cellular aging.
That should change how we think about exercise.
Exercise is often treated like an optional lifestyle habit, something people try to fit in when they have time. But if regular intense exercise is connected to longer telomeres and a younger cellular profile, then movement belongs in the same conversation as longevity, prevention, and long-term health.
The goal is not simply to live longer. The goal is to live longer with a body that still works.
Strength, endurance, mobility, and metabolic health all matter because they determine what kind of life a person can physically participate in as they age. Longer life has less value if the body loses the capacity to move, lift, walk, recover, and engage with the world.
Exercise helps protect that capacity.
The larger point is simple: movement is not only something we do for fitness. It is something we do to preserve the body’s ability to keep functioning well over time.
If you want to age better, exercise cannot be an afterthought. It has to become part of the way you live.
Reference
Tucker, Larry A. “Physical Activity and Telomere Length in U.S. Men and Women: An NHANES Investigation.” Preventive Medicine 100, July 2017, 145-151. https://doi.org/10.1016/j.ypmed.2017.04.027
Testosterone Starts with Cholesterol
Here is the basic pathway your body uses to make testosterone:
Cholesterol → Pregnenolone → Androstenedione → Testosterone
That matters because testosterone begins with cholesterol. In fact, every single sex hormone is synthesized from cholesterol. Cholesterol is not just something to fear on a blood test. It is a raw material the body uses to build essential hormones.
This is one reason the conversation around “heart healthy” low-fat, low-cholesterol diets needs more nuance. If the body requires cholesterol to synthesize sex hormones, then aggressively avoiding dietary fat and cholesterol may create problems for hormone production, vitality, and healthy aging.
Testosterone is not produced out of nothing. The body needs the right ingredients. Cholesterol is one of those ingredients.
Research supports this connection. A 1997 study published in the Journal of Applied Physiology looked at testosterone and cortisol in relation to dietary nutrients and resistance exercise. The researchers found that men who consumed more saturated fat, monounsaturated fat, and cholesterol had higher testosterone levels than men who followed a lower-fat diet.¹
This does not mean someone should eat unlimited saturated fat or ignore cardiovascular health. It means that dietary fat and cholesterol should not automatically be treated as enemies. The body uses them for important biological functions, including the production of testosterone and other sex hormones.
The larger point is that hormones are built from nutrients. If the diet is missing key raw materials, the body may struggle to produce hormones at optimal levels. A low-fat, low-cholesterol diet may sound healthy on the surface, but if it compromises the body’s ability to make sex hormones, then it may not support vitality as well as people assume.
Cholesterol has been overly simplified in modern health conversations. It is often discussed only in relation to heart disease risk, while its role in hormone production, cell membranes, brain function, and vitamin D synthesis gets less attention.
That narrow view can lead people to avoid foods their body may actually need.
A better approach is to think about quality, context, and balance. The body needs enough dietary fat to support hormone production, cellular health, and metabolic function. This includes saturated fat, monounsaturated fat, and cholesterol from nutrient-dense foods.
Testosterone starts with cholesterol. That does not make cholesterol good in every context, but it does make it necessary.
And necessary nutrients should not be feared. They should be understood.
Reference
Volek, Jeff S., et al. “Testosterone and Cortisol in Relationship to Dietary Nutrients and Resistance Exercise.” Journal of Applied Physiology 82, no. 1, 1997, 49-54. https://doi.org/10.1152/jappl.1997.82.1.49
Vitamin D and Testosterone: Why Sunlight Still Matters
One of the many problems with the Western diet is that it often lacks key micronutrients the body needs to create hormones. One of the most important is vitamin D.
Vitamin D is essential for testosterone production, and this matters because many people are now deficient in vitamin D. A major reason for this is our overavoidance of UV light. Sunlight is one of the primary ways the body produces vitamin D, but many people have been taught to avoid the sun as much as possible.
That avoidance may come with a cost.
Low vitamin D status is likely one factor involved in declining testosterone levels. Testosterone is not only important for male reproductive health. It also plays a role in muscle mass, strength, energy, mood, libido, motivation, and overall vitality.
A study published in 2010 looked at the vitamin D and testosterone levels of more than two thousand men over the course of a full year. The results showed that men with healthy vitamin D levels had more testosterone and lower levels of sex hormone binding globulin, commonly known as SHBG, than men who were vitamin D deficient.¹
SHBG matters because it binds to hormones, including testosterone, making them less available for the body’s cells to use. If SHBG is elevated, free or bioavailable testosterone may be lower, even when total testosterone does not tell the full story.
In simple terms, vitamin D status may influence both how much testosterone the body produces and how much of that testosterone remains available for use.
This is important because hormone health is often discussed as if it only depends on age, genetics, or medication. But hormones are built from and regulated by the body’s environment. Nutrient status matters. Sunlight matters. Lifestyle matters.
The body cannot produce hormones properly when it is missing the raw materials and signals those systems depend on.
Vitamin D is one of those signals.
The point is not to worship the sun or ignore the risks of burning. Too much UV exposure, especially repeated sunburn, can damage the skin. But avoiding sunlight entirely creates its own problems. The body evolved with regular exposure to natural light, and vitamin D production is one of the clearest examples of why that exposure matters.
A healthier approach is not total avoidance. It is intelligent exposure.
Get sunlight in a way that respects your skin type, season, location, and tolerance. Avoid burning. Use shade, clothing, and protection when needed. But do not forget that sunlight is part of human biology, and vitamin D is part of hormonal health.
If testosterone, energy, strength, and vitality matter, then vitamin D status should not be ignored.
Sometimes supporting hormones begins with the basics: better food, better sleep, strength training, and enough sunlight for the body to make what it needs.
Reference
Wehr, E., et al. “Association of Vitamin D Status with Serum Androgen Levels in Men.” Clinical Endocrinology 73, no. 2, August 2010, 243-248. https://doi.org/10.1111/j.1365-2265.2009.03777.x