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The book is structured in three parts and ten chapters (e.g., “Nose,” “Exhale,” “Slow,” “Less,” “Chew,” “Hold It”). <ref name="MarmotTOC" />
Reviewers describe the prose as engaging, reported narrative that blends travelogue with accessible science. <ref name="Kirkus2020">{{cite web |title=BREATH: THE NEW SCIENCE OF A LOST ART |url=https://www.kirkusreviews.com/book-reviews/james-nestor/breath-new-science/ |website=Kirkus Reviews |date=20 April 2020 |access-date=19 October 2025}}</ref><ref name="BGlobe2020">{{cite news |last=Miller |first=Stuart |title=Yes, changing how you breathe will help you live longer |url=https://www.bostonglobe.com/2020/05/21/arts/living-breathing/ |work=The Boston Globe |date=21 May 2020 |access-date=19 October 2025}}</ref>
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>
 
== Chapter summary ==
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=== I – The experiment ===
 
🐒 '''1 – The Worst Breathers in the Animal Kingdom.''' In the basement of the {{Tooltip|University of Pennsylvania Museum of Archaeology and Anthropology}}, orthodontist {{Tooltip|Dr. Marianna Evans}} walks through rows of the {{Tooltip|Morton Collection}} with Nestor, reading skull labels such as “{{Tooltip|Bedouin}},” “{{Tooltip|Copt}},” “{{Tooltip|Arab of Egypt}},” and “Negro“{{Tooltip|Negro Born in Africa}}.” The specimens span centuries—some 200 years old, others thousands—and even include an Irish prisoner hanged in 1824. The older skulls’ broad dental arches and roomy nasal passages stand in sharp contrast to today’s narrowed faces. Back at {{Tooltip|Stanford}}, an X-ray gives a deli-slicer view of Nestor’s head: a V-shaped palate, a severely {{Tooltip|deviated septum}}, and {{Tooltip|concha bullosa}}. {{Tooltip|Stanford}} {{Tooltip|rhinology}} chief {{Tooltip|Jayakar Nayak}} threads an endoscope deep inside and uses a wire-bristle tool the size of a mascara brush to sample his nasal tissue—about 200,000 cells—to see how obstruction changes bacterial growth over time. The museum bones and the clinical images tell the same story: less “real estate” at the front of the skull, less space to breathe. As palates rise, nasal cavities shrink and airflow stalls. Humans have become the outlier mammal because facial growth now constricts the airway; reduced maxillary and nasal space increases resistance and congestion that cascade into snoring and {{Tooltip|sleep-disordered breathing}}. ''Overall, humans have the sad distinction of being the most plugged-up species on Earth.''
 
👄 '''2 – {{Tooltip|Mouthbreathing}}.''' At {{Tooltip|Stanford’s Department of Otolaryngology—Head & Neck Surgery}}, the team sets up a two-phase, 20-day trial to stress-test the airway. Phase I runs ten days: Nestor and fellow participant {{Tooltip|Anders Olsson}} plug their noses and breathe only through their mouths while keeping daily routines unchanged. Olsson has flown roughly 5,000 miles from {{Tooltip|Stockholm}} and paid more than $5,000 to join, raising the stakes beyond a curiosity. 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. Between phases they return to repeat the same panel, comparing mouth-only with nose-only results under the same sleep, meals, and exercise. A deep swab taken at the outset tracks how obstruction alters the {{Tooltip|nasal microbiome}} across the ten days. Within days of mouth-only breathing, tissues dry, soft structures collapse at night, and inflammation rises—changes that show up in the lab numbers. When Phase II flips to nasal breathing along 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.
 
=== II – The lost art and science of breathing ===
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💨 '''4 – Exhale.''' In 1968, choir director–turned–respiratory coach {{Tooltip|Carl Stough}} worked with {{Tooltip|U.S.}} athletes preparing for the {{Tooltip|Mexico City Olympics}}, teaching long, complete exhalations that trained the diaphragm to do the heavy lifting at 7,300 feet. In his 1970 book and later documentary, Stough described how singers, emphysema patients, and sprinters learned to empty stale air before taking in fresh air—using coordinated exhale drills instead of forceful inhales. Decades of epidemiology back the focus on the “out” breath: the {{Tooltip|Framingham Study}} linked lower vital capacity to higher cardiovascular risk (1983), and a {{Tooltip|University at Buffalo}} follow-up tied lung function to all-cause mortality (2000). Clinical work adds a twist—{{Tooltip|Johns Hopkins}} researchers found in 2013 that “bigger appears to be better” after lung transplant, with oversized lungs improving one-year survival—underscoring the payoff of usable capacity. Exhaled breath analysis identifies thousands of compounds (over 3,000), a reminder that clearing metabolized gases and pollutants isn’t automatic unless the diaphragm sweeps fully. Prioritize the exit to improve the entrance: a longer, complete exhale restores diaphragm mechanics, optimizes {{Tooltip|CO₂}}, and improves oxygen delivery, sleep, and stamina.
 
🐢 '''5 – Slow.''' In 2001, cardiologist {{Tooltip|Luciano Bernardi}} timed the {{Tooltip|Ave Maria}} and a {{Tooltip|Sanskrit}} mantra in a controlled study and found both naturally paced breathing near six breaths per minute, boosting heart-rate variability and {{Tooltip|baroreflex sensitivity}}. A decade later, Italian researchers at 17,000 feet showed that slow, deep breathing improved oxygen saturation and hemodynamics at altitude with minimal effort. Lab protocols converge on roughly five-and-a-half breaths per minute—about 5.5-second inhales and 5.5-second exhales—where respiration and circulation synchronize and the autonomic nervous system steadies. Psychophysiology studies report that this cadence increases {{Tooltip|vagal tone}} and produces coherent oscillations between breath and pulse. Count the seconds, not the breaths, and let the diaphragm set a smooth tidal rhythm you can keep during walks, desk work, or recovery rides. Slowing the breath synchronizes body systems for efficiency and calm by increasing {{Tooltip|HRV}} and baroreflex gain, stabilizing {{Tooltip|CO₂}}, and entraining {{Tooltip|cardiorespiratory coherence}} so less effort delivers more oxygen where it counts.
 
➖ '''6 – Less.''' In the 1950s and 1960s at {{Tooltip|Akademgorodok}} in Siberia, physician {{Tooltip|Konstantin Buteyko}} trained patients to breathe less—lighter, quieter, and through the nose—to raise end-tidal {{Tooltip|CO₂}} toward a healthy zone and ease symptoms tied to chronic overbreathing. Historical data sets show resting breathing rates and minute ventilation drifting upward across the twentieth century, while modern reviews describe a sizable share of “dysfunctional“{{Tooltip|dysfunctional breathing”breathing}}” even in otherwise healthy controls. Sports researchers and clinicians have since adapted reduced-breathing drills and {{Tooltip|hypoventilation intervals}}; small trials report gains in {{Tooltip|VO₂ max}} and better control of asthma triggers when patients learn to tolerate gentle “air“{{Tooltip|air hunger}}.” The rule is counterintuitive: don’t haul in more air; leak less of it out each minute by easing the volume and cadence. Efficiency beats volume: mild {{Tooltip|hypercapnic training—breathingtraining}}—breathing lighter and quieter through the nose—resets {{Tooltip|chemoreceptors}}, keeps {{Tooltip|CO₂}} in range, and leverages the {{Tooltip|Bohr effect}} so tissues receive more oxygen without breathing harder.
 
🦷 '''7 – Chew.''' 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 to stresses; 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.
 
=== III – Breathing+ ===
 
➕ '''8 – More, on Occasion.''' In 1871, physician {{Tooltip|J. M. Da Costa}} described “irritable heart” in {{Tooltip|Civil War}} veterans—racing pulses, chest pains, breathlessness that could strike “30 or more times” a day—an early map of stress syndromes tied to disordered breathing. Over the next century the labels changed—soldier’schanged—{{Tooltip|soldier’s heart}}, {{Tooltip|shell shock}}, {{Tooltip|PTSD}}—but the physiology looked familiar. This chapter introduces Breathing+, short bursts of deliberate over-breathing and strong holds intended to push chemistry out of its rut and back again. In 2014 at {{Tooltip|Radboud University Medical Center}}, twelve volunteers trained in a {{Tooltip|Wim Hof}}–style protocol and then received an {{Tooltip|E. coli endotoxin}}; during three hours of coached breathing the trained group showed surges in {{Tooltip|epinephrine}}, higher anti-inflammatory {{Tooltip|IL-10}}, lower pro-inflammatory cytokines, and fewer flu-like symptoms. On the same spectrum, {{Tooltip|Sudarshan Kriya}} cycles through om-chanting, 4-4-6-2 paced holds, and an extended period of vigorous breathing; {{Tooltip|Tummo}} pairs waves of forceful inhalations with retentions to generate heat. Field notes include Monday-night online sessions with instructor {{Tooltip|Chuck McGee}}—“become the eye of the storm”—and safety rules that ban water, driving, and other hazards during practice. The thread running through all of it: these methods are occasional tools, not an all-day way of life. Used briefly and on purpose, controlled over-breathing and holds spike adrenaline and alter blood gases to dampen inflammation and nudge the {{Tooltip|vagus nerve}} toward balance. ''Willing yourself to breathe heavily for a short, intense time, however, can be profoundly therapeutic.''
 
⏸️ '''9 – Hold It.''' On a muggy morning in {{Tooltip|Tulsa, Oklahoma}}, the {{Tooltip|Laureate Institute for Brain Research}} wires the subject with a {{Tooltip|galvanic skin conductance sensor}} and a {{Tooltip|pulse oximeter}}, then delivers a lab mix from a yellow cylinder holding 75 pounds of {{Tooltip|CO₂}}—an {{Tooltip|NIH}}-funded experiment run by neuropsychologist {{Tooltip|Justin Feinstein}}. The first 35% hit brings tunnel vision and a pounding skull; two more doses follow, each an attempt to widen chemoreceptor tolerance. Feinstein’s line of work builds on {{Tooltip|Alicia Meuret}}’s randomized trial at {{Tooltip|Southern Methodist University}}: twenty panic patients wore {{Tooltip|capnometers}} and learned to slow breathing to raise {{Tooltip|CO₂}} before attacks, reversing dizziness, {{Tooltip|air hunger}}, and the sense of suffocation. The chapter separates unconscious breathholding ({{Tooltip|email apnea}} at the desk) from conscious breathholding ({{Tooltip|pranayama}} and therapeutic retentions) and ties both to outcomes. It also links breath to fear: stimulate the {{Tooltip|amygdalae}} and breathing can cease; break communication between {{Tooltip|amygdalae}} and {{Tooltip|chemoreceptors}} and people brace for panic all day. Practice is simple in shape—hold just to {{Tooltip|air hunger}}, recover softly through the nose, repeat—but difficult in sensation. Over time the suffocation alarm arrives later and softer. Intentional retentions raise {{Tooltip|CO₂}} tolerance so fear feels manageable instead of overwhelming by training central {{Tooltip|chemoreceptors}} and down-weighting amygdala reactivity, reducing panic without forceful inhaling.
 
⏱️ '''10 – Fast, Slow, and Not at All.''' The tour ends on {{Tooltip|Avenida Paulista}} in {{Tooltip|São Paulo}}, where 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. After a decade of fieldwork and self-tests, the chapter closes with a boundary line: 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.''
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👍 '''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">{{cite web |title=Breath: The New Science of a Lost Art |url=https://www.libraryjournal.com/review/breath-the-new-science-of-a-lost-art |website=Library Journal |date=1 May 2020 |access-date=19 October 2025}}</ref>
 
👎 '''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. <ref name="SleepReview20201204" /> Beyond reviews, a 2023 meta-analysis of randomized trials found small-to-moderate benefits of breathwork for stress, anxiety, and depressive symptoms, while urging caution due to moderate risk of bias and heterogeneity in studies. <ref name="SciRep2023">{{cite journal |last=Fincham |first=Guy William |author2=Clara Strauss |author3=Jesus Montero-Marin |author4=Kate Cavanagh |date=9 January 2023 |title=Effect of breathwork on stress and mental health: A meta-analysis of randomised-controlled trials |journal=Scientific Reports |volume=13 |pages=432 |doi=10.1038/s41598-022-27247-y |url=https://pmc.ncbi.nlm.nih.gov/articles/PMC9828383/ |access-date=19 October 2025}}</ref>
 
🌍 '''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/guests/james-nestor |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}}. <ref name="RSShortlist2021">{{cite web |title=Shortlist for 2021 Royal Society Science Book Prize revealed |url=https://royalsociety.org/news/2021/09/book-prize-shortlist-2021/ |website=Royal Society |date=29 September 2021 |access-date=19 October 2025}}</ref> Nestor later created a long-form course, “The“{{Tooltip|The Power of Your Breath}},” for {{Tooltip|BBC Maestro}}, reflecting mainstream uptake of breathwork education. <ref name="BBCMaestro2025">{{cite web |title=James Nestor — The Power of Your Breath |url=https://www.bbcmaestro.com/courses/james-nestor/the-power-of-your-breath |website=BBC Maestro |access-date=19 October 2025}}</ref> Educational outreach also included contributions to {{Tooltip|The Global Classroom}}’s breathing programming for schoolchildren in 2021. <ref name="GlobalClassroom2021">{{cite web |title=The Global Classroom’s Top Five Breathing Techniques for Children |url=https://www.theglobalclassroom.com/the-global-classrooms-top-five-breathing-techniques-for-children/ |website=The Global Classroom |date=25 March 2021 |access-date=19 October 2025}}</ref>
 
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