The key ideas

Breath: The New Science of a Lost Art

James Nestor, 2020

Why don't eight hours in bed save you from a groggy morning, and why do deep “energizing” breaths sometimes just make your head spin? Journalist James Nestor experiments on himself and on volunteers and shows that it isn't about how much air you take in. It's about how you breathe: through your mouth, or slowly through your nose. Simple habits that bring back sleep, clarity, and energy within weeks.

Who it is for

Anyone who sleeps poorly, feels tired or anxious a lot, and wants to understand a simple but underrated habit — their own breathing

Breathing is the only vital function of the body we can consciously control, and almost no one takes advantage of it.

What the book is about

We tend to assume breathing is already fine — after all, it happens on its own twenty-five thousand times a day. This book overturns that confidence: it turns out most people breathe incorrectly — too fast, too deep, too much through the mouth — and this quietly undermines sleep, the nervous system, posture, and even the shape of the face. The author shows that breathing is a rare health lever entirely within our control, and that a few simple habits can restore it in weeks, not years.

This book matters because it wasn't written by an armchair theorist but by a man who stuffed tubes up his own nose and deliberately wrecked his breathing for days to see what happens to the body. The idea grew out of a personal health crisis and a hunger to understand why ancient and traditional cultures barely knew chronic snoring, crooked bites, and anxiety — while modern people know them all too well.

Idea 1. The mouth is a backup exit, not the main entrance

The nose is a full-fledged air-processing system: it warms the air, moistens it, filters out dust, and adds nitric oxide, which helps the lungs absorb oxygen. The mouth does none of this — it simply lets air pass straight through, unprocessed. So constant mouth breathing isn't a minor habit; it's a way of depriving the body of part of its natural defense and efficiency. It's worth consciously reclaiming the habit of breathing through the nose, both during the day and especially at night.

For months, Igor wondered why his throat felt scratchy and he had a nagging cough after his morning run. His coach suggested running the first half of the distance with his mouth deliberately closed, breathing only through the nose, at a slower pace. Three weeks later the scratchiness was gone, and so was his morning sluggishness.

Check yourself throughout the day: if your mouth is closed by default, you're on the right track.

Read in Livria

About the author

James Nestor is an American journalist who has spent years writing about the human body and its hidden reserves; for this book he spent years gathering scientific data and running experiments on himself.

All books by this author: James Nestor

Terms from the book

  • Apnea
  • hyperventilation: a state where a person breathes faster and deeper than the body needs, causing carbon dioxide levels in the blood to drop
  • diaphragm: a dome-shaped muscle beneath the lungs that does the main work of breathing when you breathe correctly, instead of the shoulders and chest
  • CO2 tolerance: the body's ability to calmly handle a higher level of carbon dioxide without falling into panic or breathlessness

All terms

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