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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.

Dr. Jack Feldman, a pioneer in respiration research, explained the mechanics and neural control of breathing. He detailed how the diaphragm and rib cage facilitate air exchange, driven by the pre-Bötzinger complex for inspiration and a separate oscillator for active expiration. Feldman emphasized the mammalian diaphragm's evolutionary advantage, enabling efficient oxygen uptake through a vast alveolar surface area, critical for supporting large brains. He also discussed physiological sighs, involuntary deep breaths occurring every few minutes to prevent alveolar collapse, a vital mechanism for lung health and mechanical ventilation. The podcast then explored breathing's profound impact on brain states and emotional regulation. Rodent studies showed that deliberate slow breathing significantly reduces fear responses, demonstrating a mechanistic effect on neural circuits. This influence operates via olfactory signals, vagus nerve activity (linked to depression relief), and carbon dioxide levels, which affect brain pH and can induce anxiety. Volitional breathing also sends descending commands that modulate emotional states. Feldman suggested breathing practices can disrupt and weaken maladaptive neural circuits, promoting healthier brain function. He personally recommends short, consistent box breathing for improved performance and well-being. Finally, the discussion covered magnesium L-threonate, a supplement discovered to enhance long-term potentiation (neuroplasticity) and cognitive function. Human studies revealed it improved cognitive age by an average of eight years in individuals with mild cognitive decline and also aids sleep. Feldman underscored the value of mechanistic studies, even in rodents, to understand the efficacy and optimal application of these practices and supplements, moving beyond anecdotal evidence.

Welcome to the Huberman Lab podcast. I'm Andrew Huberman, a professor at Stanford, and today we're discussing the vagus nerve, also known as cranial nerve 10. The vagus nerve is a vast network connecting the brain and body, resembling its own nervous system. It plays a crucial role in various functions, including mood regulation, alertness, and relaxation. Recent research has provided actionable tools to control the vagus nerve, allowing for improved mood, relaxation, and learning without pharmacological aids. The vagus nerve is unique as it carries both sensory and motor information. While it is often associated with calming effects, it can also enhance alertness depending on which pathways are activated. Understanding the vagus nerve's dual role is essential for effectively utilizing its functions. The vagus nerve's sensory pathways collect information from various organs, including the gut and lungs, and relay this information to the brain. This sensory input influences our levels of alertness and mood. For instance, the gut produces serotonin, which is crucial for mood regulation, and its levels are communicated to the brain via the vagus nerve. To enhance vagal tone and improve heart rate variability (HRV), which is linked to better health outcomes, one can engage in practices such as deliberate extended exhales throughout the day. This simple technique can help regulate the autonomic nervous system balance between sympathetic and parasympathetic activity. Exercise also plays a significant role in activating the vagus nerve. Engaging large muscle groups during physical activity releases adrenaline, which stimulates the vagus nerve and increases alertness. This connection between physical movement and brain activation highlights the importance of exercise for cognitive function and motivation. Additionally, the vagus nerve is involved in the modulation of serotonin levels in the brain. Adequate gut health, supported by a diverse microbiome and sufficient tryptophan intake, is essential for maintaining healthy serotonin levels. Consuming low-sugar fermented foods can enhance gut microbiota, which in turn supports serotonin production. For calming effects, specific practices can activate the vagus nerve pathways. Techniques such as gentle neck stretches, humming, and the physiological sigh can stimulate the vagus nerve and promote relaxation. These practices are supported by neurophysiological evidence and can be easily incorporated into daily routines. In summary, the vagus nerve is a complex and vital component of our nervous system, influencing mood, alertness, and overall health. By understanding its functions and employing practical techniques, individuals can harness the power of the vagus nerve to enhance their well-being and cognitive performance.

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.

James Nestor discusses how the human habit of dysfunctional breathing underpins a wide range of health issues, emphasizing that breathing is a continuous, energy-driving process rather than just a response to food and drink. He argues that most people breathe suboptimally due to anatomical and lifestyle changes that have emerged with industrialization, particularly noting smaller mouths and narrower airways that push people toward mouth breathing. The conversation explores how soft, processed foods and reduced chewing in early childhood contribute to facial and dental development that limits airway space, linking these structural changes to snoring, sleep apnea, and impaired nasal breathing. The discussion then shifts to the physiology of breathing, explaining that mouth breathing tends to shallowly pull air into the chest, reduces CO2 tolerance, and disrupts the balance of oxygen delivery to tissues. Nestor explains CO2’s essential role in releasing oxygen from hemoglobin and maintaining blood pH, warning that chronic over-breathing can place the body under sustained low-grade stress and blur the line between rest and stress. The host and guest examine the nose as the preferred conduit for air, noting benefits such as nitric oxide production, improved filtration, and better sleep quality when nasal breathing is habitual. They cover practical strategies to retrain breathing, including daytime nasal breathing, diaphragmatic technique, and gradual use of sleep tape, while acknowledging that structural obstructions may require medical or dental interventions such as deviated septum corrections or orthodontic considerations. Throughout, the pair reflect on the variability of individual circumstances, offering a spectrum of approaches rather than universal prescriptions. The episode also delves into broader implications for chronic disease, sleep, and mental health, highlighting the potential of breathing retraining to improve conditions like asthma, hypertension, and anxiety by stabilizing the autonomic nervous system and reducing nocturnal arousal. Personal stories from the guests, expert references, and a focus on accessible, low-cost practices underscore the theme that empowering everyday breathwork can meaningfully extend healthspan, provided foundational, consistent habits are established.

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.

James Nestor discusses the significance of nasal breathing and its health benefits, sharing insights from his experiment at Stanford. He highlights the dangers of chronic mouth breathing, which affects air purification and can lead to various health issues, including hypertension and sleep apnea. Nestor emphasizes that nasal breathing not only conditions the air but also enhances oxygen uptake and releases nitric oxide, a molecule that helps combat viruses and supports overall health. The conversation touches on the importance of breathing techniques, such as humming, which can increase nitric oxide production significantly. Nestor shares his personal experiences during a 21-day study where he alternated between mouth and nasal breathing, revealing drastic changes in his health metrics, including increased blood pressure and sleep disturbances during mouth breathing. He explains that many people have become chronic mouth breathers due to environmental factors, anatomical changes, and lifestyle habits. Nestor discusses the potential need for surgical interventions for those with severe structural issues but advocates for exploring natural breathing techniques first. He mentions the use of mouth taping at night to encourage nasal breathing and the benefits of nasal strips to enhance airflow. The discussion also delves into the broader implications of breathing on mental and physical health, including its role in stress management and overall well-being. Nestor argues that breathing is often overlooked in medical assessments, despite its foundational role in health. Nestor shares surprising insights from his research, including the idea that evolution does not necessarily lead to improved health outcomes and that breathing can be used to regulate body temperature, as demonstrated by certain breathing techniques used by monks. He references Wim Hof's breathing method, which has shown potential in reducing symptoms of infections. The conversation concludes with Nestor emphasizing the importance of integrating healthy breathing practices into daily life, encouraging listeners to prioritize nasal breathing and explore various techniques to improve their health. He advocates for a holistic approach to well-being that includes mindfulness about breathing, diet, and lifestyle choices.

In this episode of the Huberman Lab Podcast, Andrew Huberman speaks with Dr. Jack Feldman, a leading neurobiologist known for his groundbreaking research on the neuroscience of breathing. They discuss the critical role of breathing in overall health, mental focus, sleep, and emotional regulation. Dr. Feldman explains the mechanics of breathing, emphasizing the diaphragm's role and the brain centers responsible for regulating breath patterns, particularly the pre-Botzinger complex, which generates the rhythm of breathing. Dr. Feldman highlights the importance of breathing patterns, noting that how we breathe can influence our mental and physical states. He shares his own breathing protocols that can help enhance focus, reduce stress, and improve sleep. The conversation also touches on the physiological sigh, a natural mechanism that helps maintain lung health by preventing alveolar collapse, and how sighing occurs more frequently than most people realize. The discussion extends to the impact of breathing on emotional states and cognitive function. Dr. Feldman notes that breathing can be both a response to emotional states and a tool for influencing them. He describes how different breathing practices can modulate brain activity and emotional responses, suggesting that breathwork can be a powerful tool for mental health. Dr. Feldman also discusses the potential benefits of magnesium threonate, a supplement that may enhance cognitive function and support brain health. He explains how magnesium levels can influence neuronal activity and learning processes, emphasizing the importance of maintaining optimal magnesium levels for cognitive performance. Throughout the episode, Dr. Feldman encourages listeners to explore breathwork practices, suggesting that even short sessions can yield significant benefits. He advocates for a personalized approach to breathing techniques, encouraging experimentation with different methods to find what works best for individual needs. The conversation concludes with a call for more research into the mechanisms of breathing and its effects on health and cognition, highlighting the need for further exploration in this burgeoning field. Dr. Feldman's insights provide a comprehensive understanding of the intricate relationship between breathing, brain function, and overall well-being.