CHAPTERS
- 0:00 – 3:35
Premium AMA Introduction and Purpose of the Channel
Huberman introduces this Ask Me Anything episode and explains the structure and goals of the Premium channel. He emphasizes that Premium subscriptions support the free, weekly podcast and help fund human-based research on mental and physical health and performance, amplified by a matching donation from the Tiny Foundation.
- •Huberman Lab Podcast releases a free, full-length episode every Monday on all major platforms.
- •The Premium channel exists to financially support the standard podcast and fund human research.
- •The Tiny Foundation matches every research dollar generated via the Premium channel.
- •Subscription options include monthly, annual, and lifetime access via hubermanlab.com/premium.
- 3:35 – 6:05
Why Colds and Flus Increase in Winter: Seasonality and Day Length
Responding to a question about winter illnesses, Huberman affirms that there is a real increase in colds and flus during winter. He distinguishes between living near the equator and in high-latitude regions, explaining how shorter days typically correlate with colder temperatures and set the stage for behavioral changes that increase transmission.
- •Data clearly show higher prevalence of colds and flus in winter months.
- •Winter is defined by shorter days and longer nights, especially at higher latitudes.
- •Shorter days generally correlate with colder outdoor temperatures almost everywhere on Earth.
- •These environmental changes alter how people behave and where they spend their time.
- 6:05 – 11:45
Indoor Living, Proximity, and Viral Transmission Mechanics
Huberman details how cold weather drives people indoors, increasing physical proximity and shared air, which boosts transmission risk. He describes studies on distance-dependent infection probabilities and notes that sneezing, coughing, hand-to-face contact, and physical touch all elevate the chance of spreading or catching a virus.
- •Cold, short days push people indoors, where they tend to gather closer together.
- •Laboratory studies show a strong relationship between distance from a sick person and infection risk (1 vs. 3 vs. 6 feet).
- •Transmission occurs via droplets from sneezing and coughing, but also handshakes, hugs, kissing, and contaminated surfaces.
- •Eye rubbing, nose wiping, and poor hand hygiene in sick individuals spread virus onto skin and objects.
- •Social etiquette: people who know they’re sick should avoid exposing others to infection.
- 11:45 – 15:40
Dry Air, Heating, and the Vulnerable Nasal Passages
He explains that heated indoor air in winter is typically very dry and that this dryness particularly affects the nasal passages. Since the nose is a key barrier system—with hairs, mucus, and a resident microbiome—drying it out weakens defenses and makes respiratory infections more likely to take hold.
- •Cold outdoor air is very dry; indoor heating often dries the air further.
- •The nasal mucosa is a primary defense site against viral, bacterial, and fungal pathogens.
- •Nasal hairs, mucus, and local microbiota physically trap and neutralize many incoming pathogens.
- •Keeping nasal mucosa intact and moist supports overall respiratory and immune health.
- •The anatomical proximity from nostrils to brain and deeper respiratory pathways underscores the importance of robust nasal defenses.
- 15:40 – 18:55
Nasal Versus Mouth Breathing and Illness Susceptibility
Huberman argues strongly for nasal breathing under most conditions and discusses how mouth breathing undermines health. Citing a study on children, he notes that habitual oral breathing is linked to more allergies, more frequent sickness, and higher medication use, reinforcing the protective value of nasal breathing.
- •Nasal breathing is preferred except when eating, speaking, or during very intense exercise that requires mouth breathing.
- •Nasal hairs and mucus serve as a physical and biological filter for inhaled air.
- •A cited paper on children shows oral breathing correlates with more allergies and illness.
- •The relationship is bidirectional: nasal breathers tend to be healthier; mouth breathers tend to get sick more.
- •Nasal breathing also has aesthetic and dental benefits compared with chronic mouth breathing.
- 18:55 – 24:50
Humidification and Practical Strategies to Reduce Winter Illness
He recommends practical tools for supporting nasal and respiratory health during winter, especially for those who frequently get sick. Using humidifiers—particularly at night—can keep airways moist, improve resistance, and potentially blunt the severity of infections you may already be fighting from daily exposures.
- •Humidifying bedroom air at night is a simple, effective way to keep nasal passages moist.
- •Humidifiers in offices or main living spaces can further support respiratory health.
- •Even if exposure still occurs, better airway condition may help your immune system ward off full-blown illness.
- •We constantly encounter pathogens; immune and physical defenses are working all day to keep infections subclinical.
- •Good sleep substantially influences how severe an infection feels and how well you cope with it.
- 24:50 – 31:15
Outdoor Cold, Rewarming, and the Role of Body Temperature
Huberman discusses being outdoors in cold weather and why traditional advice to rewarm after getting chilled has merit. He emphasizes that fever is an adaptive immune response designed to help destroy viruses, and that indiscriminately lowering fever may hinder viral clearance, though dangerously high fevers still require intervention.
- •Cold outdoor exercise is not discouraged but can dry out nasal and oral passages.
- •Rehydrating and rehumidifying airways after cold exposure (hot shower, steam, sauna, humidifier) is beneficial.
- •Core body temperature relates to susceptibility; fever is the body’s attempt to heat and damage viruses.
- •There is a narrow safe range for body temperature—excessive fever can damage tissues, especially the brain.
- •Medicating fever should balance safety concerns with the recognition that some fever is protective.
- 31:15 – 34:10
Cold Exposure, Wim Hof Breathing, and When They May Backfire
He previews a forthcoming discussion on cyclic hyperventilation (e.g., Wim Hof breathing) and deliberate cold exposure as tools to enhance immunity. These stressors may help prevent infections if used proactively, but if you are already getting sick or clearly infected, they can be counterproductive and potentially worsen your condition.
- •Cyclic hyperventilation breathing and deliberate cold exposure can, in some contexts, help prevent infection.
- •If you are already contracting or have contracted a virus or bacterial infection, these stressors may be harmful.
- •Timing, baseline health, and existing immune activation determine whether these tools help or hurt.
- •Future episodes will detail protocols for using these methods safely and effectively.
- 34:10
Closing, Winter Illness Summary, and Premium Channel Reminder
Huberman recaps that winter increases colds and flus and that tools like nasal breathing, humidification, and managing exposure can reduce risk and severity. He then invites listeners to join the Premium channel for full AMA episodes, transcripts, and to directly support matched funding of human research on mental and physical health and performance.
- •Winter has more circulating colds and flus; understanding why allows targeted prevention.
- •Behavioral tools: nasal breathing, humidified indoor air, exposure awareness, and social responsibility when sick.
- •He plans a full-length episode dedicated solely to colds and flus and how to avoid them.
- •Premium subscriptions fund research that will inform future, widely available protocols.
- •The Tiny Foundation matches all Premium-derived research funds dollar-for-dollar.
