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== Introduction ==
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It became a {{Tooltip|New York Times bestseller}} and a {{Tooltip|Washington Post Notable Nonfiction Book of 2020}}, and—according to the publisher—has sold more than three million copies in 44 languages. <ref name="PRH2020" /><ref name="WPostNotable2020">{{cite news |title=50 notable works of nonfiction in 2020 |url=https://www.washingtonpost.com/entertainment/books/50-notable-works-of-nonfiction-in-2020/2020/11/16/37f4c4de-2069-11eb-b532-05c751cd5dc2_story.html |work=The Washington Post |date=19 November 2020 |access-date=19 October 2025}}</ref>
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== Part I – The experiment ==
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👄 At {{Tooltip|Stanford’s Department of Otolaryngology—Head & Neck Surgery}}, the team runs a two-phase, 20-day trial to stress-test the airway. Phase I lasts ten days: Nestor and fellow participant {{Tooltip|Anders Olsson}} plug their noses and breathe only through their mouths while keeping daily routines unchanged. Olsson flies roughly 5,000 miles from {{Tooltip|Stockholm}} and pays more than $5,000 to join. Before starting, Nayak maps the passages with endoscopy and imaging, then the clinic collects baseline measures: blood gases, inflammatory markers, hormones, smell tests, {{Tooltip|rhinometry}}, and pulmonary function. A deep swab taken at the outset tracks how obstruction alters the {{Tooltip|nasal microbiome}} across the ten days. Between phases, they repeat the same panel, comparing mouth-only with nose-only results under the same sleep, meals, and exercise. Within days of mouth-only breathing, tissues dry, soft structures collapse at night, and inflammation rises—changes that appear in lab measures. When Phase II switches to nasal breathing with basic drills, airflow and pressure stabilize and many changes reverse. Within days, the pathway you choose—mouth or nose—reshapes physiology. {{Tooltip|Nasal resistance}}, humidification, and filtration create pressure and chemistry a mouth cannot match, protecting blood gases, airway tone, and microbial balance.
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== Part II – The lost art and science of breathing ==
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🦷 Walk the {{Tooltip|Paris Catacombs}} and you’ll see roomy dental arches in skulls stacked along the tunnels; then compare them with the narrowed jaws common today—a visual record of how softer, industrialized food changed faces. Research from {{Tooltip|University College Dublin}} suggests crowding and {{Tooltip|malocclusion}} surged around the first farmers roughly 12,000 years ago, when diets shifted and chewing loads fell. In the 1930s, dentist-researcher {{Tooltip|Weston A. Price}} reported wide arches and straight teeth in traditional societies, then documented how processed staples correlated with shrinking jaws and airway problems; in laboratory work he examined more than a thousand ancient skulls without finding the modern pattern of crooked arches. The mechanism is mechanical: bones remodel under load; when chewing is hard and frequent in childhood, the palate widens and the nasal airway grows with it. Modern orthodontics can expand palates and improve airflow, but daily habits still matter—tougher foods and mindful chewing provide the growth signals appliances try to mimic. Form follows force: what and how we chew shapes the airway because sustained {{Tooltip|masticatory load}} stimulates bone growth in the {{Tooltip|maxilla}} and {{Tooltip|mandible}}, creating space for teeth and the nose—and space to breathe.
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== Part III – Breathing+ ==
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⏱️ On {{Tooltip|Avenida Paulista}} in {{Tooltip|São Paulo}}, Nestor meets {{Tooltip|Luíz Sérgio Álvares DeRose}}, a teacher of pre-modern {{Tooltip|pranayama}} who treats yoga as a technology of breathing and attention. Two questions frame the visit: how heavy Breathing+ protects cold-exposed practitioners, and how slow practices keep monks warm without strain. Lab reports capture both poles: {{Tooltip|Bön}} and Buddhist meditators sitting in 40°F rooms with 49°F wet sheets raise body temperature by double digits while lowering metabolic rate by as much as 64%, results documented in {{Tooltip|Nature}} and reported by {{Tooltip|Harvard}} researchers. At the other extreme, deliberate hyperventilation spikes adrenaline and leaves some practitioners able to consume more oxygen long after the session ends. Between these poles sits {{Tooltip|Sudarshan Kriya}}, a four-phase sequence—om-chanting, breath restriction, 4-4-6-2 pacing, then extended fast breathing—that can shift mood and physiology at scale. The patterns differ but the logic is the same: fast to stimulate, slow to stabilize, sometimes not at all to reset—always away from water, cars, and cliffs. A boundary line remains: breath is powerful and limited. Match the cadence to the goal—use speed to spark, slowness to soothe, and stillness to rewire—because each lever adjusts {{Tooltip|CO₂}}, pH, and autonomic set points; these complement medicine, not replace it. ''No breathing can heal stage IV cancer.''
''—Note: The above summary follows the Riverhead hardcover edition (26 May 2020; ISBN 978-0-7352-1361-6).''<ref name="PRH2020">{{cite web |title=Breath by James Nestor: 9780735213616 |url=https://www.penguinrandomhouse.com/books/547761/breath-by-james-nestor/ |website=Penguin Random House |publisher=Penguin Random House |date=26 May 2020 |access-date=19 October 2025}}</ref><ref name="OCLC1138996691">{{cite web |title=Breath : the new science of a lost art |url=https://search.worldcat.org/title/Breath-%3A-the-new-science-of-a-lost-art/oclc/1138996691 |website=WorldCat |publisher=OCLC |access-date=19 October 2025}}</ref><ref name="MarmotTOC">{{cite web |title=Breath : the new science of a lost art |url=https://cmc.marmot.org/Record/.b61211722 |website=Marmot Catalog |publisher=Marmot Library Network |access-date=19 October 2025}}</ref>
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== Background & reception ==
🖋️ '''Author & writing'''. Nestor is a science journalist and author of ''{{Tooltip|Deep}}'' (2014); the publisher notes that ''Breath'' follows his reporting across labs, ancient burial sites, Soviet facilities, choir schools, and city streets to examine how breathing works and why it went awry. <ref name="PRH2020" /> He frames the book as a “scientific adventure,” linking breathing patterns to health and recounting how recurrent respiratory issues led him to
📈 '''Commercial reception'''. Nestor’s site records that ''Breath'' spent 20 weeks on the {{Tooltip|''New York Times'' bestseller list}}
👍 '''Praise'''. ''{{Tooltip|Kirkus Reviews}}'' called the book “a welcome, invigorating user’s manual for the respiratory system.” <ref name="Kirkus2020" /> ''{{Tooltip|Publishers Weekly}}'' praised it as a “fascinating ‘scientific adventure’” that convincingly argues everyday breathing is “vital to get right.” <ref name="PWReview2020" /> {{Tooltip|The ''Boston Globe''}} highlighted its “entertaining, eerily well-timed” explanations of proper breathing and its potential to change daily habits. <ref name="BGlobe2020" /> ''{{Tooltip|Library Journal}}'' deemed it “highly recommended,” noting the clear synthesis of research, interviews, and techniques. <ref name="LJ2020"
👎 '''Criticism'''. In the ''{{Tooltip|Wall Street Journal}}'', {{Tooltip|Sam Kean}} faulted the book for not applying enough skepticism to “dicey” evidence and for underplaying placebo effects. <ref name="WSJReview2020">{{cite news |last=Kean |first=Sam |title='Breath' Review: Eager Breather |url=https://www.wsj.com/articles/breath-review-eager-breather-11590953832 |work=The Wall Street Journal |date=31 May 2020 |access-date=19 October 2025}}</ref> Psychiatrist {{Tooltip|Kate Womersley}}, writing in ''{{Tooltip|The Spectator}}'', argued that Nestor leans heavily on anecdotes and makes overbroad claims about {{Tooltip|nitric oxide}} and {{Tooltip|CO₂}}, cautioning against turning “enhanced breathing” into a commercial self-optimization trend. <ref name="Spectator20200801">{{cite news |last=Womersley |first=Kate |title=We all breathe – 25,000 times a day – so why aren’t we better at it? |url=https://www.spectator.co.uk/article/we-all-breathe-25-000-times-a-day-so-why-aren-t-we-better-at-it/ |work=The Spectator |date=1 August 2020 |access-date=19 October 2025}}</ref> A trade article in ''{{Tooltip|Sleep Review}}'' welcomed the book’s accessibility but warned that popular practices like mouth-taping should not displace clinical diagnosis and care
🌍 '''Impact & adoption'''. ''{{Tooltip|Fresh Air}}'' devoted a full episode to Nestor on 27 May 2020, amplifying the book’s core ideas to a national audience. <ref name="FreshAir20200527">{{cite web |title=How The 'Lost Art' Of Breathing Can Impact Sleep And Resilience |url=https://freshairarchive.org/segments/how-lost-art-breathing-can-impact-sleep-and-resilience |website=Fresh Air Archive (WHYY/NPR) |date=27 May 2020 |access-date=19 October 2025}}</ref> The book was shortlisted for the 2021 {{Tooltip|Royal Society Science Book Prize}}
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== See also ==
{{Youtube thumbnail | Gr2XFEDPGf0 | Core messages of ''Breath''}}
{{Youtube thumbnail | f6yAY1oZUOA | 5 Ways to Improve Your Breathing}}
{{Why We Sleep/thumbnail}}
{{Outlive/thumbnail}}
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{{How to Stop Worrying and Start Living/thumbnail}}
{{Emotional Intelligence/thumbnail}}
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== References ==
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