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Disclosure

I am the founder and Chief Executive Officer of NutriScience Corporation, which owns EnergyFirst and Greens Plus. Both companies sell nutritional supplements, a number of them in categories this book discusses, and I have a direct financial interest in all of it.

I am telling you this on page one because it should change how you read what follows.

Every recommendation in the body of this book is made in terms of nutrients, foods and practices, not brands. Where the evidence for a supplement category is weak, I say so, including for categories my companies sell. Where I have changed my position since the fourth edition, I say what I got wrong and why. I recommend no product of mine anywhere in this book. Where a category my companies sell comes up, I say so on the page, every time.

You should be skeptical of health advice from people who sell health products. Read this book that way. I have tried to write something that survives it.

How to use this book

You do not have to read this in order, and most people will not. The five essentials are Parts Three through Seven, in the order I would prioritize them. If you came for one thing, go to that part and start there.

Three things repeat.

The Bottom Line. Every one of the forty chapters ends with one. If you read nothing else in a chapter, read that box. It is the argument compressed into what you would actually do.

What Changed. Twenty-three chapters carry at least one. It is where I mark what this edition reverses from the fourth edition, the 2013 one, and why. If you own that edition, these are the pages that matter most to you.

Doctor Question If. Chapter 33, where you go when something is not working, flags eight situations as belonging with a physician rather than with a book. Take those literally.

References are numbered by Part rather than continuously, and each Part’s list sits at its end. A superscript twelve in Part Four points to Part Four’s twelfth reference, and the numbering restarts in Part Five.

The back matter is meant to be used rather than read. Appendix A holds the worksheets and trackers, Appendix B a shopping list, Appendix C the questions I am asked most, and Appendix D a page to hand your physician.

Chapter 2. The problem with feeling fine

Most people who need this book do not feel sick.

They feel a little tired in the afternoons. They sleep adequately rather than well. They have gained somewhere between eight and thirty pounds since their thirties without ever having gained it in any particular year. Their annual physical comes back with a few numbers flagged in yellow and a doctor who says, not unkindly, that they should probably watch the carbs and try to get to the gym. They are, by the only standard most of us apply, fine.

Forty percent of American adults have obesity.¹¹ More than half of adults over sixty-five have prediabetes.¹² Forty million Americans have diabetes, and roughly eleven million of them do not know it.¹² And only about one in eight American adults is metabolically healthy by a strict definition: normal blood glucose, normal triglycerides, normal HDL, normal blood pressure, normal waist circumference, none of it maintained by medication.¹³

That last number is easy to misread. It does not mean that seven in eight Americans are ill. It means that seven in eight have at least one thing already drifting. It is a measure of how many adults have nothing yet going wrong, and the answer is: not many.

One more number. Between 2013, when the last edition of this book was published, and 2023, overall adult obesity prevalence in the United States did not change significantly. Severe obesity rose from 7.7 percent to 9.7 percent.¹¹ The middle of the distribution held roughly still while the far end got worse. Whatever the last decade of health advice, technology, apps and content accomplished, it did not reach the people furthest from health.

I have spent that decade selling nutrition products and writing about health. I am implicated in that number, and so is everyone else in this industry.

The gap this book is about

There is a wide territory between sick and well, and almost nobody is measuring it.

The medical system is built, sensibly, around disease. It is very good at identifying the moment a value crosses a threshold and a diagnosis attaches. It is much less good at the fifteen years before that moment, during which the value was drifting in a direction anyone could have seen. Your fasting glucose can climb from 82 to 99 over a decade and never once be flagged, because 99 is normal. It is normal in the way that the last dollar in your account is solvent.

This book is about that territory. Much of how well you function in your sixties is decided in your forties and fifties, and the things deciding it are largely within your control.

Those things are not exotic. They are what you eat, how you move, how you sleep, how you recover from stress, and who you spend your life with. That is the whole list. Paying attention is how you find out whether the list is working; it is not an item on it. You need a book not because the list is complicated but because the environment is working against you, most of the advice available is unreliable, and the details matter enormously: how much protein, what kind of training, which numbers to track.

What you can actually expect

This is where health books start lying.

If you follow what is in this book with reasonable consistency, this is what the evidence and twenty-two years of watching people do it suggest you can expect.

Within the first week or two, you will likely notice more stable energy across the day and fewer cravings. Part of this is real: stabilizing your food intake stabilizes how you feel. Part is the ordinary effect of paying attention to something, which is worth having but does not last on its own.

After that, the timeline is slower than any advertisement. Energy improves in weeks, body composition in months, bloodwork in a season. Chapter 9 gives the timelines the physiology permits, and the reason people quit is usually the gap between those and the ones they were sold.

I am not going to tell you that you will look twenty years younger or become a different person. Some people do experience changes of that magnitude. Most experience something more modest and more durable: they feel substantially better, they get meaningfully stronger, their numbers improve, and the trajectory they were on quietly changes direction.

That is worth doing.

The Bottom Line

Do not wait for a diagnosis to start. Only about one in eight American adults has nothing yet drifting, and the drift is silent for years. So this week, pull up your last bloodwork and look at the direction each number is moving, not at whether it was flagged. Then put your attention, on purpose rather than by accident, on the five things that decide the trajectory: what you eat, how you move, how you sleep, how you come down from stress, and who you spend your life with.

Chapter 4. The five essentials

This chapter hands you a test, so that you never have to take a health author’s list on faith, including mine. Four questions: is the effect large, can something else substitute for it, can you actually change it, and does it apply to almost everyone. Apply them yourself and you can watch two items that sat on this list for twenty-two years fail.

Every health book has a list, and most are assembled the same way: the author writes down what he believes in, in roughly the order of his own confidence, and the number lands wherever it lands. Mine was assembled that way in 2004. It had six items and one of them was water. I have got it wrong twice since, water in the first four editions and antioxidant supplements in the third and fourth, which is reason enough to hand you the test rather than a third assertion of my judgment. Water does not need the test: it is a component of nutrition rather than a peer of it, and it now lives in Chapter 16.

The test

Magnitude. The difference between having this right and having it wrong has to be large, measured against outcomes that matter: how long you live, how well you function, how you feel at four in the afternoon. Not detectable. Not statistically significant. Large enough that you would notice its absence. Several items here rest on observational evidence rather than trials, and for those the association has to be big enough and consistent enough that no plausible amount of confounding makes it disappear.

Non-substitutability. Nothing else on the list can cover for it. If a shortfall in one thing can be made up by doing more of another, the first is a component of the second and not an entry in its own right.

Modifiability. You have to be able to change it yourself, this year, without a prescription. Your genome influences your health more than anything on this list. It is not on the list. Neither is the neighborhood you grew up in, which the epidemiology says matters a great deal.

Universality. It has to apply to essentially every adult rather than to a subgroup. Iron status matters enormously to menstruating women, and to very few other people. That earns it a chapter, and it gets one. It does not earn it a place here.

A thing has to pass all four.

The five

1. Nutrition. Enough protein, mostly whole food, adequate fiber, and a carbohydrate-to-fat balance you can sustain, all of which the earlier editions called energizing nutrition. Magnitude: the largest single lever most people have. Non-substitutable: no quantity of training compensates for eating badly, which is most of what the next chapter is about. Modifiable and universal by definition: you eat several times a day whether or not you think about it, so the only question is whether any thinking happens. It is where most of this book is spent.

2. Movement. Both kinds, cardiorespiratory work and strength work, because they do different things. Magnitude: the effect sizes in Chapter 19 are among the largest in this book. Non-substitutable: nothing else on the list replaces training, and cardiorespiratory work and resistance work do not replace each other. Modifiable, universal: yes, at every age that has been studied.

3. Sleep. Magnitude: six nights of restricted sleep can reduce glucose tolerance by roughly 40 percent in healthy young men.¹⁶ Restrict sleep during a diet and you lose substantially more of your weight as lean tissue and less as fat.¹⁷ Non-substitutable: completely. You cannot out-train it, out-eat it or supplement past it, and the attempt is the most common failure I see among the accomplished, busy people I spend my life around. Modifiable: mostly, and Chapter 25 is about the part that is. Universal: yes.

4. Recovery. By which I mean the daily work of coming back down from stress, not recovery from training, which is a subset and belongs to Chapter 23. Sleep is the largest part of this work, and it is on the list on its own because it passed the test on its own. Magnitude: living under sustained stress for years is a large exposure with well-documented physiological consequences. The things you can do about it are individually modest. Chapter 27 gives the effect sizes, and they are smaller than the industry selling them implies. The test asks about the difference between having this right and having it wrong across years, not about the size of any single technique, and on that reading it passes. It is still the weakest pass of the five and you should know that. Non-substitutable: yes, and it works in the other direction too. Sustained stress degrades every other item on this list. Modifiable, universal: yes, and yes.

5. Connection. New to the list. Magnitude: across 148 prospective studies covering 308,849 people, those with stronger social relationships had 50 percent higher odds of surviving follow-up, and where the measurement was good the association was larger still.¹⁸ Nothing in the supplement chapters is close. Non-substitutable: no amount of protein, training or sleep does this job. Modifiable: not by deciding to have more friends, since nobody does that, but by structure, which is what Chapter 28 is about. The structure that has worked for me for twenty-plus years is a peer group with a fixed date and expected attendance: first the Entrepreneurs’ Organization and YPO, and now TIGER 21, where I chair two groups. The people in those rooms are the friends I did not have at forty. Universal: yes. Chapter 28 has the age pattern, which is not what most people assume.

In 2013 this was a clause inside “rest and relaxation.” That was a filing error. Connection is not a stress-management technique; it is a separate input, and it is the most under-reported finding in this field.

The two that failed

The test removed two things I have been publishing for twenty-two years.

Supplementation fails on magnitude, and then it fails on universality.

Every edition of this book has said that optimal health is roughly 75 percent nutrition, 20 percent exercise and 5 percent supplementation. I still think that ratio is a useful guide to dividing your attention between what you eat and how you train; the next chapter says what it leaves out. But a thing you yourself price at five percent is not an essential. Calling it one was category inflation that happened to run in the direction of my own commercial interest, which is precisely the error a reader should expect from an author in my position.

It fails universality as well. Every supplement worth taking is conditional: vitamin D if you are deficient, creatine if you lift, omega-3 if you do not eat fish, iron if a blood test says so, B12 if you eat no animal products, protein powder if your schedule beats your protein target. There is no supplement that every adult should take, and none that any adult must. Several of those are stand-ins for food, which means they struggle on the non-substitutability test too, since a supplement is by definition a way of covering a shortfall in something else.

Supplements have not been removed from the book. Three chapters still cover them, and the part they sit in is now titled for what they are: the last five percent. What has been removed is the claim that they belong in the same sentence as sleep.

Listening to your body fails differently. It is not an input at all.

Self-monitoring is how you run the program. It is the fuel gauge, and a fuel gauge is not fuel. Every other item on this list acts on your body. This one is something you do to find out whether the others are working. Keeping it on the list confuses the method with the material, and that confusion has a cost. It is part of how people end up owning four measuring devices and no training program.

The instruments are in Part Two: continuous glucose monitors, sleep tracking, heart rate variability, at-home biomarker panels, and a candid account of what each cannot tell you. They come first because you need a starting point before you need a program. Part Nine returns to them as the way to check whether the program is working.

What the test does not settle

Three limitations worth knowing before you lean on this list.

The first is that “large” and “non-substitutable” are judgments rather than measurements. I have applied them consistently and shown the working, but a reasonable person could read the same evidence and argue that recovery sits one level down, or that connection and recovery are one essential rather than two. I would not fight hard about either.

The second is grouping. The strict test would split movement into two entries, since aerobic and resistance work do not substitute for each other. A list of six that reads nutrition, cardio, lifting, sleep, recovery, connection is defensible on the evidence and worse as an instruction, because nobody experiences going to the gym as two separate essentials. Where the test and the reader’s day disagree, I have gone with the reader’s day, and I would rather tell you that than have you notice it.

The third is that the items interact. Nutrition and movement are not independent; sleep affects every other item; connection affects sleep and stress and almost certainly what you eat. A clean list implies a separability the body does not have. This is a way of allocating attention, not a diagram of physiology.

The order matters

These are listed in order of impact, not order of implementation. For most people most of the time, nutrition produces the largest share of the result, movement the next largest, and everything else fills in from there; that is the reasoning behind the 75/20/5 heuristic the next chapter examines.

But Chapter 38’s ninety-day sequence does not start with the largest lever. It starts with the easiest one, because the goal in week one is not maximum effect. It is building the evidence, for yourself, that you are a person who does what he said he would do. That evidence is worth more in month six than a perfect week in month one.

You do not have to do all of this

Health books tend to present themselves as all-or-nothing, and readers tend to respond accordingly, usually by doing nothing.

If you did only one thing from this book, and that thing was eating enough protein, you would get a meaningful fraction of the available benefit. If you did two, add resistance training twice a week. If you did three, sleep seven hours. Those three, done consistently and nothing else, would put you ahead of the large majority of people trying much harder in less useful directions. The rest is refinement.

The Bottom Line

Start with three: enough protein, resistance training twice a week, seven hours of sleep. Done consistently, those put you ahead of most people trying harder in less useful directions. Then add recovery from stress and one structure that puts you in a room with other people, because both passed the same four tests: large effect, nothing else substitutes, you can change it yourself, it applies to nearly everyone. Supplements failed two of those tests and self-monitoring is the gauge rather than the fuel; give neither the attention you owe the five.

What Changed

The fourth edition’s six essentials were Pure Water, Energizing Nutrition, Effective Exercise, Essential Supplementation, Rest & Relaxation, and Listening to Your Body. Six changes. Water is no longer a standalone essential; it matters, but not at anything like the weight of the others, and it now sits inside the nutrition section. Sleep has been promoted out of “Rest & Relaxation” into an essential of its own. Supplementation has been demoted: by the book’s own 75/20/5 heuristic it is worth about five percent, and every supplement worth taking is conditional on some fact about you. Listening to Your Body has been demoted for a different reason: it is the method you run the program with rather than an input to health. Connection is added, on an association larger than anything in the supplement chapters. “Effective Exercise” has been renamed “Movement,” because the evidence in Part Four is as much about what you do in the other twenty-three hours as about training.

Superscript numbers refer to the references at the end of each part of the book. All of them are listed at energyguidebook.com/references.