Sleep. Eat. Exercise.

Hype examined

Eighty-two pages on the few things that change health outcomes, and nothing else. Every claim is traced to a primary source and carries a grade for how good that source is.

If you are a reviewer, start here

The system map from page 6: seven nodes across sleep, nutrition and exercise, joined by twelve numbered pathways, five drawn solid and seven dashed.
Page 6. Twelve pathways between the pillars. Five are established and drawn solid, seven are associations and drawn dashed.
What it is

A short list, not a long book

You already know the basics. Sleep more, eat better, exercise more. What you do not have is a way to tell which parts of the noise are worth anything: the cold plunges, the peptides, the fasting windows, the shelf of supplements. This book reads the research, keeps the short list of things that change outcomes, and cuts whatever did not survive the evidence.

  • No miracle supplement
  • No glucose panic
  • No anti-aging pill
  • No 30-day fix
The method

Why you could believe any of it

Because the method is the credential. Almost every claim is traced to a study, and every study carries a grade. Where the evidence is thin, the book says so. Where a number is a working rule rather than a trial result, the book says that too.

  • 82pages
  • 132graded sources
  • 6evidence tiers
  • 12mapped pathways
Where the 132 sources sit on the evidence scale A bar chart. Strong, 12 sources. Established, 15. Moderate, 45. Emerging, 28. Guideline, 29. Background, 3 and ungraded. Strong 12 Established 15 Moderate 45 Emerging 28 Guideline 29 Background 3, ungraded
Strong 12, Established 15, Moderate 45, Emerging 28, Guideline 29, Background 3. Most of the useful lifestyle evidence sits at Moderate, and the book says so on the page rather than dressing it up. The rubric borrows the shape of GRADE and departs from it in two named places, both stated on page 9.
What earns each grade
GradeWhat earns it
StrongMeta-analysis or systematic review of randomized trials, large enough to settle the direction.
EstablishedAt least one well-conducted randomized trial, or evidence settled enough that the direction is not in dispute.
ModerateProspective cohorts, or more than one trial where the samples are small, the durations short or the outcomes stand-ins.
EmergingCross-sectional or mechanistic work, animal studies, or one small trial standing on its own. Drawn as a dashed line on the map.
GuidelineA clinical body reviewed the evidence and made a recommendation, and the book says which body.
BackgroundReading that informs the argument without being a study, so it carries no grade.
What is in it

Three pillars, one system

The book treats sleep, food and training as one loop rather than three separate lists, because that is how the evidence behaves. Twelve pathways connect them. Five are established and drawn solid, and the other seven are associations and drawn dashed.

  • Sleep. Where to start

    A fixed wake time, morning light, caffeine and alcohol timing, and what each stage of the night does. Pages 13 to 23.

  • Eat. The fuel

    Protein and plants, the six nutrients that matter, fiber, and the gut as something you feed rather than test. Pages 24 to 34.

  • Exercise. The engine

    Strength, an easy aerobic base, a little hard work, balance, and where recovery happens. Pages 35 to 44.

The shape of the book across 82 pages Eight parts drawn to scale along the length of the book. Front matter, pages 1 to 12. Sleep, 13 to 23. Eat, 24 to 34. Exercise, 35 to 44. Data and support, 45 to 49. Making it stick, 50 to 53. The situations, 54 to 67. The back matter, 68 to 82. Front matter 1 to 12 Sleep 13 to 23 Eat 24 to 34 Exercise 35 to 44 Data, support 45 to 49 Making it stick 50 to 53 The situations 54 to 67 Back matter 68 to 82 Warning signs, page 69. Sources, from page 77.
Each bar sits where that part sits in the book and is drawn to its true length. Front matter 1 to 12, Sleep 13 to 23, Eat 24 to 34, Exercise 35 to 44, Data and support 45 to 49, Making it stick 50 to 53, The situations 54 to 67, the back matter 68 to 82. The system map is on page 6, the grade rubric on page 9, the warning signs on page 69, and the source list runs from page 77.
The conflict

Where I sit, and where that might show

I am in the wellness industry, so I sell into the same space this book covers. Read all of it knowing that.

I grade supplement categories on the evidence like everything else, and I grade most of them down, including the ones I work in. Support comes last in the book, is graded hardest, and sits behind a screen designed to talk you out of most of it. Wherever a free basic does the job, the book says to do that instead.

The place my interest is most likely to show is sleep. It goes first and gets as much room as any pillar, partly because of the evidence and partly because it is what I know best.

Before you use any of it

This is information, not medical advice

Nothing in the book or on this site was written about you, because I do not know your history, your medicines or your conditions. It is not a substitute for a doctor, a pharmacist or a nurse, and reading it does not put you in anyone's care.

Do not start, stop or change a medicine because of anything here. Where the book says something needs adjusting, that is a question to put to whoever prescribes for you. If anything here contradicts what your own clinician has told you, they are right and the book is wrong.

Do not delay care because of anything you read. If something worries you, get it looked at. Thresholds, doses, what is available on prescription and what you are obliged to report all differ by country, so use the figure that applies where you live. The book is written for adults, and the disclaimer that governs every page is on page 2.

The full terms, and how this site handles your data.