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Breath can be a switch you flip on your biology, a power you can align with the body’s natural rhythms. In a line of Italian studies, prayers that exhale for five to six seconds and then slowly inhale produced a state of coherence across multiple systems, a pattern called coherent breathing. James Nestor traces this thread to predecessors of Wim Hof and to the Bon Buddhist tumo, a technique said to generate heat through controlled breath and metabolic modulation. He explains two versions: the traditional tumo, a slow, heat-generating process, and the commercialized “tumo light” with short breaths and muscular compression during breath holds that can trigger sweat even in cold. Nestor has practiced the latter, noting it can warm you instantly, while the slower form remains more guarded and esoteric. The conversation then dives into personal practice: Sudarshan Kriya opened Nestor’s eyes to the power of breath work, after years of respiratory infections and nights spent hearing himself breathe. He numerically cites the link between sleep-disordered breathing in kids and ADHD, arguing that many cases are breathing problems misdiagnosed as neurological, and urging parents to assess nasal breathing, mouth breathing, and snoring rather than defaulting to pills. Techniques center on becoming an obligate nasal breather and gradually extending the nasal approach into sleep, using aids like mouth tapes and Myotape to train lips shut at night. He relays his own dramatic breakthrough with sleep tape, and notes that many athletes and doctors are studying these patterns with growing interest. A central thread follows Nestor’s obsession with indoor air quality. He showcases a carbon dioxide monitor and outlines decades of studies showing cognitive performance dipping as indoor CO2 rises, with marked effects around 1,500 to 5,000 parts per million. He travels with monitors, records hotel air, and finds many green-certified buildings fail to deliver fresh air, often recirculating backwash. His practical advice: ensure windows open where possible, request rooms with ventilation, and, when unavoidable, use a monitor database to guide choices. He also shares metrics like the bolt score for CO2 tolerance, a quick nasal-breathing test that climbs with regular training, and praises diaphragmatic breathing and resistance devices for athletes. The conversation closes on writing, discipline, and the craft of turning years of notes into a cohesive narrative.

Welcome to the Huberman Lab podcast, where Andrew Huberman discusses the significance of breathing for mental and physical health. Breathing is essential for life, but its quality profoundly affects our well-being and performance. Huberman emphasizes that breathing is unique because it can be controlled consciously, bridging the conscious and subconscious mind. This control allows us to manage stress, alertness, and even hiccups through specific techniques. Breathing involves the intake of oxygen and the removal of carbon dioxide, both of which are crucial for bodily functions. Huberman clarifies that carbon dioxide is not merely a waste product; it plays a vital role in oxygen delivery to cells. He explains the mechanical aspects of breathing, including the roles of the nose, mouth, diaphragm, and intercostal muscles, as well as the importance of alveoli in gas exchange. Huberman introduces the concept of "physiological sighs," a breathing technique involving two deep inhales followed by a long exhale, which effectively reduces stress and autonomic arousal. He notes that many people overbreathe, leading to insufficient carbon dioxide levels, which can impair cognitive function and increase anxiety. He encourages listeners to practice diaphragmatic breathing and emphasizes the benefits of nasal breathing over mouth breathing for overall health. The podcast also covers the relationship between breathing patterns and cognitive functions, revealing that inhalation enhances learning and memory while exhalation supports physical performance. Huberman discusses the carbon dioxide tolerance test as a measure of breathing efficiency and introduces box breathing as a method to improve breathing patterns. Huberman highlights a recent study showing that structured breathwork practices, particularly cyclic sighing, can significantly reduce stress and improve mood compared to meditation. He explains that one physiological sigh can quickly restore calm and balance the autonomic nervous system. The episode concludes with practical advice on managing breathing during exercise, addressing hiccups, and the importance of maintaining a healthy breathing pattern. Huberman encourages listeners to explore these breathing techniques to enhance their mental and physical health, emphasizing that these practices are accessible and cost-free.

Controlling stress in real time is possible through breathing. Inhaling speeds up heart rate, while exhaling slows it down. Longer exhales promote calmness, utilizing respiratory sinus arrhythmia and heart rate variability to manage stress effectively.

Take a breath in through the nose, plug your nose, and exhale all the way to the bottom of the exhale. Hold it there until you feel the first desire to breathe, and then inhale when you want to breathe. The perfect breath is five and a half seconds in and five and a half seconds out. We're told we breathe too much and we're never taught how to breathe. James Nestor conducted a 10-day mouth-breathing experiment followed by 10 days of nasal breathing, with nasal breathing reducing stress-related issues. Olympic runner Zatopek popularized breath holding to train to do more with less. Hyperventilation—breathing in excess of the body’s needs for oxygen—can cause lightheadedness, anxiety, and high blood pressure. Breathing is about meeting metabolic needs, and CO2 levels, not oxygen, drive the process; Bohr effect explains improved oxygen delivery with CO2.

The episode centers on breathing as a daily, foundational physiology that can influence a broad range of health outcomes. James Nestor argues that while breathing happens automatically, habitual patterns—like mouth breathing and shallow chest breaths—undermine sleep, oral health, cognitive function, and athletic performance. He recounts how ancient cultures treated breathing as medicine and explains that modern life conditions, including indoor environments and processed diets, have driven a shift toward dysfunctional breathing. The conversation covers how mouth breathing at night can alter facial development, reduce nasal airflow, and contribute to sleep-disordered breathing, with implications for growth, jaw structure, and long-term health. The guests discuss practical pathways to revert to nasal, diaphragmatic breathing as a default, noting studies that link improved breathing mechanics to lower blood pressure, better oxygen utilization, and heightened mental clarity. They describe a simple nasal-breathing exercise—placing a hand on the abdomen and tracing five-second inhalations and five-second exhalations—to retrain the nervous system toward a state of relaxation and coherence. The dialogue also delves into more intense breath-work practices, sharing experiences of heightened emotion and transient physiological changes, while cautioning that the most reliable benefits come from building a normal, nasal-breathing foundation first. The discussion broadens to everyday environmental factors, such as carbon-dioxide levels in schools, offices, and aircraft, underscoring how indoor air quality can affect cognitive performance and energy. Throughout, Nestor emphasizes that solutions are inexpensive, accessible, and largely about habit change—breathing in a slower, deeper, nasal pattern and tuning into one’s body signals to reduce chronic stress and inflammation. The talk weaves personal anecdotes, historical context, and clinical observations to present a picture of breathing as a key determinant of health, cognition, and daily vitality, while debunking myths that breathing improvements require expensive gear or exotic rituals. The episode concludes with a reminder that progress comes from consistency and foundational practice, setting the stage for further exploration of breath-focused approaches that are grounded in science and everyday life.