Spiral Staircase, second edition
Your body was built for a world that no longer exists.
In 1966, five healthy young men in Dallas spent three weeks in bed. When they got up, they had lost more aerobic fitness than the next three decades of aging would take from them. Nothing had been done to them. Something had been taken away.
The argument of this book fits in five words: the environment is the intervention.
A reference register, not a summary
Most health writing asks you to take its confidence on trust. This one publishes its working. Every recommendation carries a mark for the strength of the evidence behind it. Every chapter carries the case against itself. Where the first edition was wrong, the correction is printed rather than quietly dropped.
This site carries that apparatus in full: what each body system evolved to expect, what the modern environment gives it instead, what happens in the gap, and how confident anyone is entitled to be. The narrative argument, the studies in full and the 2,076 notes are in the book.
How every claim here is marked
The full register59 strong, 127 probable, 48 emerging, of 234 graded recommendations.
- StrongEvidence grade: Strong. Multiple randomized controlled trials, or consistent large cohort studies with a well-understood mechanism.59
Multiple randomized controlled trials, or consistent large cohort studies with a well-understood mechanism.
- ProbableEvidence grade: Probable. Good observational evidence with a plausible mechanism, or small or few trials.127
Good observational evidence with a plausible mechanism, or small or few trials.
- EmergingEvidence grade: Emerging. Early, small, animal-only, or actively contested.48
Early, small, animal-only, or actively contested.
The book in nine parts
Each chapter stands on its own. You can open the one that describes the problem you have without reading the forty-four around it.
- Part 1
The Ground Floor
The 200-Million-Year Warm-Up. Standing Up. The Expensive Organ. The Last Ice Age and the Birth of Agriculture.
5 chapters - Part 2
The Body that Moves
The Sitting Disease. The Foot That Forgot the Ground. The Heart That Remembers the Savanna. The Invisible River.
5 chapters - Part 3
The Body that Eats
The Hijacked Reward System. The Gut That Expects Dirt. The Thrifty Body. The Liver and the Chemical Century.
7 chapters - Part 4
The Body that Defends
The Immune System's Education. The Largest Organ. The Fever and the Old Enemies. The Pain You Were Not Supposed to Keep.
5 chapters - Part 5
The Body that Reads Signals
Sleep and the Dark You Have Lost. The Indoor Eye. The Thermoneutral Trap. The Ear in the Silent Room.
5 chapters - Part 6
The Social Animal
Stress and the Hijacked Alarm. The Social Animal in Solitary Confinement. The Attention Economy and the Boredom Deficit. The Mind That Cannot Find Its Village
4 chapters - Part 7
The Life Course
The Reproductive Paradox. Born Too Soon. The Children's Mismatch. The Hallmarks of Aging.
5 chapters - Part 8
Finding the Handrail
The Individual Variable. The Case Against This Book. The Unified Field of Mismatch. The Handrail I: Move, Eat, Drink.
7 chapters - Part 9
The Next Turn
The Luxury Trap Accelerates. Designing the Bridge. The View from Here
3 chapters
Start with the Prologue, which sets out the whole argument, or browse all 47 chapters.
Three ways to use it
Nine claims, graded
Seed oils, raw milk, grounding, the carnivore diet, mouth taping, barefoot shoes, cold plunges, skipping sunscreen, detox teas. A verdict and the study behind each.
OpenThe body map
Every system marked on a figure, with what it evolved to expect and what the modern environment supplies instead.
OpenThe signal check
Answer for an ordinary week and get back the signals your environment withholds, ordered by the strength of the evidence. No score, nothing sent anywhere.
Open
Graded claims
234 recommendations, marked
59 strong, 127 probable, 48 emerging or contested. Each one links to the chapter that argues it and the studies behind it.
- ·Train balance and strength, especially after 60
- ·Move through the day, every day
- ·Raise your ceiling
Corrections
71 claims the first edition got wrong
Published rather than quietly dropped, because a book that never corrects itself is not a reference. Several are claims still repeated widely online.
- ·Chronic back pain is not a modern disease
- ·ADHD medication is not a last resort
- ·Melatonin is not an established anti-cancer agent (Chapter 22),
Glossary
118 terms, defined as the book uses them
Each entry gives the term, the one fact most worth carrying away, and the chapter where the evidence lives.
- ·Allostatic load
- ·Constrained total energy expenditure
- ·Compression of morbidity
What the book is built on
2,076 notes resolve to 1,941 distinct sources, published between 1819 and 2026. Most of the evidence is recent, because most of it is recent: the questions this book asks were not answerable until the measurements existed.
Most cited: Nature, Science, PNAS, The Lancet, New England Journal of Medicine. The full register.
Common questions
- What is evolutionary mismatch?
- Evolutionary mismatch is the gap between the world a body evolved in and the world it lives in now. A body reads signals from its surroundings, movement, light and darkness, microbes, heat and cold, food and other people, and was built for the versions its ancestors met. Modern life supplies too much of some, too little of others, and much that is new.
- What is this site?
- It is the reference layer for the book Spiral Staircase, second edition, by Neil P. Bostick. It publishes the book's mismatch cards, its graded recommendations, its Skeptic's Corners, its glossary, its source register and its corrections. The narrative argument stays in the book.
- What do the evidence grades mean?
- Strong means multiple randomised controlled trials, or consistent large cohort studies with a well-understood mechanism. Probable means good observational evidence with a plausible mechanism, or small or few trials. Emerging means early, small, animal-only, or actively contested. Every recommendation on this site carries one of the three.
- Is any of this medical advice?
- No. It is educational material about published research. Nothing on this site replaces medical care, and nothing on it is a reason to stop, skip or adjust a prescribed treatment.
The book
Spiral Staircase: How Your Ancient Body Navigates the Modern World
Forty-five chapters through every major system of the body: the heart, the gut, the immune system, sleep, stress, the eye, the jaw, pain, cancer, aging, and the mind that cannot find its village. Every recommendation graded. Every chapter arguing against itself. One entire chapter making the case against the book.
As far as we can find, the only book that takes the whole body, system by system, from how it evolved to what it needs to thrive. How it compares
- Author
- Neil P. Bostick
- Edition
- Second Edition, 2026
- Chapters
- 45, plus prologue and epilogue
- Notes
- 2,076
- Paperback
- 645 pages
- Hardcover
- 529 pages
Also available: the first edition
The short version: 34 chapters in 268 pages, cited but ungraded. It is a quick introduction to the idea, and the second edition corrects it in 71 places, all listed free on this site.