Talk to Breath: The New Science of a Lost Art like its author wrote you back.
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What it argues
Breath is James Nestor's investigation into one of the most basic and overlooked aspects of human health: how we inhale and exhale. Nestor spent a decade reporting on pulmonology labs, free-diving records, ancient yogic texts, and Stanford clinical trials to reach a conclusion that sounds almost absurd: most people in the modern world are breathing wrong, and the consequences run from bad sleep to crooked teeth to anxiety disorders.
The book moves between Nestor's own experiments — including a Stanford study where researchers blocked his nose with silicone plugs for ten days to document the effects of mouth-breathing — and a wide cast of researchers, athletes, and practitioners who have spent careers studying breath. He traces how mouth-breathing became normalized through industrialization and processed food, how it reshaped the human skull and airway over generations, and why nasal breathing, slower exhalation, and breath retention have measurable effects on blood pressure, heart rate variability, and CO2 tolerance. The core physiological claim: most of us over-breathe, taking too many shallow breaths per minute, chronically expelling CO2 before tissues can absorb oxygen efficiently.
What it gets right
- 1.
Most people breathe too fast, through their mouths, taking shallow chest breaths. This pattern chronically lowers CO2 levels and makes oxygen delivery to tissues less efficient.
- 2.
Nasal breathing filters air, humidifies it, and produces nitric oxide, which dilates blood vessels and has antimicrobial properties. Mouth-breathing provides none of these benefits.
- 3.
The Bohr effect explains why CO2 matters: hemoglobin releases oxygen to tissues only in the presence of sufficient carbon dioxide. Breathing less, paradoxically, can deliver more oxygen.
What it covers
Who wrote it
James Nestor is an American science journalist and author based in San Francisco. He has written for Outside Magazine, The New York Times, The Atlantic, Scientific American, and Dwell, and is a regular guest lecturer at the Esalen Institute. His earlier book, Deep: Freediving, Renegade Science, and What the Ocean Tells Us About Ourselves (2014), explored human physiology and the science of free-diving. Breath, published in 2020, became a New York Times bestseller and brought years of reporting on respiratory research to a wide audience. Nestor continues to write and speak about human physiology and the science of breathwork.
