The Rich Roll Podcast

The New Science Of Breath: James Nestor On Why Most People Are Breathing Wrong

February 2, 2026

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  • The vast majority of modern humans breathe dysfunctionally, often through the mouth, which is linked to chronic ailments and is not the body's default or healthy mode of operation. 
  • The modern structural problem of smaller mouths and crooked teeth, stemming from the industrialization of soft foods that require minimal chewing, directly impedes nasal breathing and contributes to airway issues. 
  • Over-breathing (hyperventilation) lowers CO2 levels, which impairs oxygen delivery to cells by preventing its release from hemoglobin, simultaneously triggering a sympathetic nervous system stress response. 
  • A significant percentage of children diagnosed with ADHD may suffer from underlying sleep-disordered breathing, which can sometimes resolve when airway obstructions like tonsils or adenoids are addressed. 
  • The fundamental practice for improving health is becoming an obligate nasal breather, especially at night, and mastering diaphragmatic (belly) breathing mechanics before engaging in more vigorous breathwork practices. 
  • Building CO2 tolerance through slower, lower breathing is crucial for both general well-being and athletic performance, as it improves efficiency and can mitigate symptoms of anxiety and panic attacks. 
  • Deep, focused work, like the research leading to James Nestor's book, requires periods of 'disappearance' which are becoming economically difficult to sustain in the current culture. 
  • Immediate actionable steps for better breathing include using apps like Snore Lab or Snore Clock to diagnose nighttime breathing issues and performing a CO2 tolerance test using an extended exhale through pursed lips. 
  • To build better breathing habits, set multiple daily alarms to check posture and breathing mode (nasal vs. mouth) until these corrections become unconscious, and for children, consult a pediatric dentist specializing in airway health. 

Segments

Dysfunctional Breathing Prevalence
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(00:00:01)
  • Key Takeaway: The vast majority of people breathe in a dysfunctional way, which is a chronic problem contributing to sickness.
  • Summary: Most people breathe dysfunctionally, often defaulting to mouth breathing, which is compared to eating ultra-processed food—it sustains life but prevents optimal health. This chronic issue is linked to common ailments like asthma and anxiety, affecting the majority of modern humans. The root causes are largely tied to industrialization.
Structural Cause: Small Mouths
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(00:02:29)
  • Key Takeaway: Modern industrialization has led to smaller mouths and compressed jaws, causing malocclusion and impeding proper nasal airflow.
  • Summary: A structural problem exists where modern mouths are too small compared to ancient skulls, evidenced by the near-universal presence of crooked teeth (malocclusion). Orthodontic practices that remove teeth instead of widening the jaw contribute to this compression. This small oral cavity causes the upper palate to impinge on sinuses, leading to difficulty breathing through the nose and a default to mouth breathing.
Food Softness and Jaw Development
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(00:06:02)
  • Key Takeaway: The shift to soft, industrialized food has eliminated the necessary chewing exercise required to develop wide jaws and healthy airways.
  • Summary: The introduction of industrialized food correlates precisely with the shrinking of the human mouth across cultures, as soft foods do not require the two to three hours of daily chewing that ancestors performed. Chewing develops the necessary musculature and widens the jaw structure. Early childhood weaning practices, favoring soft purees over chewable foods, are critical years where this foundational jaw development is compromised.
Physiology of Mouth Breathing
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(00:11:21)
  • Key Takeaway: Mouth breathing results in shallow, chest-focused breaths that waste energy and signal an emergency state to the brain, perpetuating chronic stress.
  • Summary: Mouth breathing leads to shallow breaths that often fail to reach the lungs effectively, wasting energy and causing the body to breathe faster and heavier. This rapid, shallow pattern sends panic signals to the brain, maintaining a constant state of sympathetic nervous system agitation. Furthermore, chronic mouth breathing creates an acidic oral environment, which dentists identify as the number one cause of cavities.
CO2’s Role in Oxygen Delivery
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(00:13:33)
  • Key Takeaway: Carbon dioxide (CO2) is essential for delivering oxygen to tissues because it facilitates the release of oxygen from hemoglobin; over-breathing depletes CO2, hindering oxygen utilization.
  • Summary: Over-breathing causes lightheadedness and tingling not due to lack of oxygen, but due to excessive off-gassing of CO2, leading to vasoconstriction. CO2 acts as the necessary catalyst (the ‘divorce lawyer’) for oxygen to detach from hemoglobin and reach hungry cells. Perpetually low CO2 levels from over-breathing means oxygen remains bound to the blood, denying cells the fuel they need despite potentially high blood oxygen saturation readings.
Sedentary Lifestyle Impact
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(00:18:40)
  • Key Takeaway: A sedentary lifestyle characterized by poor posture, such as hunching over desks, physically restricts the diaphragm, making optimal deep breathing difficult.
  • Summary: Spending most time indoors and hunched over desks severely compromises breathing mechanics by preventing the diaphragm from descending optimally. While awareness allows for conscious correction, the goal is to build foundational habits so that balanced, unconscious breathing becomes the default state, overriding poor postural habits.
Indoor Air Quality and CO2 Levels
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(00:27:04)
  • Key Takeaway: Indoor environments, especially schools and modern hotels, often have dangerously high CO2 levels due to recycled air, which negatively impacts cognitive function and causes stress.
  • Summary: High indoor CO2 levels (often exceeding 1,500 parts per million) have been scientifically linked to significant cognitive impairment, including lower test scores. Modern buildings, including LEED-certified green buildings, often recycle air for energy conservation, leading to stale environments where one in every 25 breaths might be someone else’s exhalation. Addressing this is a fixable problem that industries and building managers can change by prioritizing fresh air circulation.
Origin of Breathing Inquiry
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(00:37:48)
  • Key Takeaway: James Nestor’s deep dive into breath science began after resolving chronic respiratory issues through a single breathwork class, followed by an assignment covering elite freedivers.
  • Summary: Nestor’s personal journey started when a doctor friend suggested a breathwork class, which immediately resolved years of recurring bronchitis and pneumonia. This led to curiosity, which was further fueled years later when he covered the World Freediving Championship. Witnessing freedivers hold their breath for minutes showed him the extreme potential of breath control, particularly in improving CO2 tolerance.
CO2 Tolerance and Chronic Illness
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(00:42:34)
  • Key Takeaway: Developing CO2 tolerance through breathwork is highly effective for managing chronic conditions like anxiety and asthma, as dysfunctional breathing often precedes these ailments.
  • Summary: Asthma onset frequently follows a period of chronic sickness that forces mouth breathing, bypassing the nose’s defense mechanisms (like nitric oxide production). Hundreds of asthmatics have resolved their symptoms by learning slow, nasal breathing, avoiding the long-term side effects of steroid medications. Improving CO2 tolerance allows the body to handle the slight CO2 increases that trigger panic in anxious individuals or asthmatics.
Stanford Mouth Breathing Experiment
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(00:57:37)
  • Key Takeaway: Forcing mouth breathing for ten days induced severe sleep apnea, 1,300% increased snoring, hypertension, and stress hormone spikes, all of which reversed within 48 hours of returning to nasal breathing.
  • Summary: The controlled Stanford study demonstrated the acute, dramatic damage of forced mouth breathing, even when diet was controlled. Snoring increased 1,300%, sleep apnea developed within days, and blood pressure spiked into Stage 1 hypertension. The immediate and complete reversal of these severe symptoms upon resuming nasal breathing highlights the critical role of nasal respiration for nighttime health.
ADHD and Sleep Disordered Breathing
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(01:02:51)
  • Key Takeaway: A significant majority (70-80%) of children diagnosed with ADHD suffer from sleep-disordered breathing, suggesting a potential physical cause rather than purely neurological origins.
  • Summary: Dentists and researchers suggest that the epidemic of ADHD may be rooted in underlying physical issues, specifically poor sleep caused by airway obstruction. The drugs used to treat ADHD often function by artificially waking the child up or sedating them at night. This connection implies that resolving sleep apnea in children could alleviate symptoms often labeled as neurological conditions.
ADHD Link to Sleep Breathing
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(01:03:26)
  • Key Takeaway: Sleep-disordered breathing is found in 70-80% of children with ADHD, and airway surgeries often resolve symptoms.
  • Summary: Dentists are increasingly focusing on the airway due to an epidemic of ADHD, noting that 70 to 80% of affected children suffer from sleep-disordered breathing. When tonsils or adenoids are removed to clear the airway, ADHD symptoms disappear in over 50% of those children. This suggests that chronic sleep apnea causes downstream effects on brain development, focus, and irritability.
Parental Action and Anecdotal Results
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(01:08:48)
  • Key Takeaway: Parents recording children’s sleep often find horrifying evidence of breathing issues, leading to rapid resolution of symptoms upon nasal breathing training.
  • Summary: Parents are advised to record their children’s sleep to identify breathing issues, as general clinicians may not address this link. Thousands of parents report that training children to breathe through the nose resolves the vast majority of their issues, sometimes within two weeks. This intervention is suggested as a worthy first check for children exhibiting symptoms resembling ADHD.
Nasal Breathing Acclimation Protocol
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(01:15:11)
  • Key Takeaway: Becoming an obligate nasal breather, especially at night, is the primary formal practice for initiating proper breathing habits.
  • Summary: The minimum requirement is breathing in and out through the nose during relaxed daytime activities, potentially using sleep tape for training. The tape protocol should be introduced slowly (’low and slow’) over several weeks to acclimate, as rushing can be disastrous. Proper relaxed breathing involves minimal chest movement, with slight expansion only in the abdominal area, similar to a meditating monk.
Nasal Strips and Structural Issues
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(01:18:09)
  • Key Takeaway: Nasal strips act as effective ’training wheels’ for those with compromised nasal passageways, potentially increasing airflow by 30%.
  • Summary: Nasal strips are helpful for individuals experiencing nasal valve collapse or small nostrils, as they can significantly ease nasal breathing. If pinching the nostrils shut makes breathing much harder, these strips can provide necessary support during the acclimation phase to nasal breathing. Structural issues like a severely deviated septum may warrant surgery, but inflammation caused by mouth breathing can also impede nasal airflow.
Breathwork vs. Foundational Breathing
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(01:21:36)
  • Key Takeaway: Advanced breathwork practices like Wim Hof should only be attempted after establishing normal, functional nasal breathing mechanics.
  • Summary: New practitioners should focus on becoming normal breathers first, as jumping into intense practices like Wim Hof or pranayama without proper basics can be counterproductive. These intense practices are meant to elevate human potential after the foundation is set, similar to how yoga was historically taught only to the healthy. Functional breathing involves training the diaphragm to move the belly, not just the chest, which 90% of people struggle to do correctly.
Hormetic Stress and Vigorous Breathing
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(01:27:23)
  • Key Takeaway: Vigorous breathwork like the Wim Hof method intentionally induces hormetic stress by manipulating CO2 and oxygen levels, causing temporary blood flow restriction to the brain.
  • Summary: These practices blow off significant CO2, making the body extremely alkaline and cutting off up to 40% of blood flow to the brain, which can induce hallucinations and profound reflection. The goal of this stress is to empty the ‘stress vessel’ so one can start anew, flipping the switch between sympathetic and parasympathetic states. This is a powerful tool for altering consciousness but is not intended as a daily habit like slow, restorative breathing.
Lung Capacity and Longevity Data
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(01:40:10)
  • Key Takeaway: Lung function and size are the most accurate markers of lifespan, according to the 70-year Framingham study, highlighting the importance of maintaining lung capacity.
  • Summary: While VO2 max and grip strength are important, maintaining lung capacity is critical for longevity because declining lung function correlates with earlier mortality. Yogic practices focus heavily on stretching and breathing to maintain and expand this ‘fuel tank,’ allowing for more energy per breath, which is vital as we age. Simple conscious effort to switch from shallow mouth breathing to deep nasal breathing offers a significant path toward healthier living.
Breathing for Athletic Performance
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(01:43:01)
  • Key Takeaway: For athletes, training CO2 tolerance and lung capacity is a primary advantage, leading to fewer breaths taken during exertion and decreased recovery times.
  • Summary: Trainers are increasingly prioritizing CO2 tolerance, as expending less energy on breathing allows athletes to stay in the race longer and go faster. Sprinters often show higher rates of asthma due to dysfunctional breathing patterns, prompting retraining efforts to maintain nasal breathing even during intense sprints. Increasing CO2 tolerance via training masks or controlled breathing reduces the total number of breaths needed, significantly impacting performance efficiency.
Breathing for Anxiety and Panic
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(01:48:05)
  • Key Takeaway: Anxiety and panic attacks are hypothesized to be caused by a low CO2 tolerance leading to a negative feedback loop of over-breathing and constriction.
  • Summary: To reverse acute panic, one can practice slow inhales through the nose, holding briefly between breaths to gradually build CO2 and relax the system. Techniques like inhaling into cupped hands (to re-inhale CO2) or performing three slow inhales followed by an exhale can signal safety to the brain. Long-term prevention involves training CO2 tolerance through slower, lower breathing patterns, often utilizing Buteyko techniques.
Cultural Impact and Deep Work
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(02:07:07)
  • Key Takeaway: Mainstream awareness of breathing science is rising from ground-up cultural impact, validating deep, time-intensive investigative work.
  • Summary: The rise of physical and mental health issues is linked to underlying causes, and change often originates from the ground up rather than solely from academic institutions. James Nestor’s success validates the model where creators disappear for years to produce quality work, though this process is becoming economically difficult to sustain. Quality work requires time, and the success of the book proves there is both an appetite and an economic model supporting this deep dive approach.
Balancing Immersion and Responsibility
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(02:08:30)
  • Key Takeaway: Achieving necessary creative immersion requires both a love for the solitary process and a supportive economic structure to afford the time away.
  • Summary: The act of disappearing for deep work brings peace but is increasingly challenging due to growing responsibilities and the current economy. Rich Roll manages this by fiercely protecting time and dropping out of social media for periods to maintain control over his creative environment (the ‘alpha world’). Rushing creative output results in noticeable deficiencies, necessitating a fight to secure slow, thoughtful time for new projects.
Actionable Daily Breathing Tools
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(02:11:16)
  • Key Takeaway: Immediate breathing improvement starts with diagnosing sleep breathing via smartphone apps and practicing nasal, slow, low, deep daytime breathing.
  • Summary: Listeners can immediately download free apps like Snore Lab or Snore Clock to record and diagnose nighttime breathing issues, which can indicate mouth breathing or sleep apnea. Once a general diagnosis is established, techniques can be used to improve nighttime breathing, though structural issues like extreme overweight may require further intervention. Daytime practice should focus on nasal breathing that is slow, low, and deep.
CO2 Tolerance and Body Awareness
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(02:12:57)
  • Key Takeaway: CO2 tolerance can be tested using a modified breath-hold technique involving a maximal inhale followed by a slow, timed exhale through pursed lips.
  • Summary: The BOLT test, or a variation using Brian McKenzie’s method, assesses CO2 tolerance by timing how long one can exhale slowly through pursed lips after a maximal inhalation. Athletes often max out around 30-40 seconds, but training can increase this duration significantly toward 60-90 seconds or more. Additionally, setting multiple daily phone alarms helps correct daytime habits by prompting checks on mouth breathing, posture, and breathing depth, making these corrections unconscious over several weeks.
Chewing and Airway Development
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(02:16:11)
  • Key Takeaway: Increased chewing, especially of harder or raw foods, benefits the back of the throat and tongue, and early intervention by a pediatric dentist is crucial for children’s skeletal development.
  • Summary: For young children (ages two to five), seeing a dentist specializing in airway health is highly recommended to build a proper foundation, potentially negating the need for braces later. While chewing benefits adults by affecting the flesh in the back of the throat and the tongue, it does not significantly alter adult skeletal structure. Harder, raw foods are generally better for promoting beneficial chewing.