How does indoor heating contribute to getting sick in winter?

Indoor heating systems often dry out the air, which in turn dries the nasal and oral passages. These passages are crucial physical barriers against viruses and bacteria, and their dryness makes them more susceptible to infection.

What is the role of nasal breathing in preventing colds and flu?

Nasal breathing helps humidify inhaled air and traps viruses and bacteria with nasal hairs and mucus. This process maintains the health of the nasal passages and respiratory tract, enhancing resistance to infections. Mouth breathing, conversely, is linked to higher susceptibility.

Is it true that if someone is sneezing or coughing, they are contagious?

Yes, according to research, anytime someone is actively sneezing or coughing due to a cold or flu, they are still contagious. Claims about not being contagious at certain stages of illness are often not substantiated by data.

Can cold exposure or Wim Hof breathing prevent illness?

Deliberate cold exposure and specific breathing techniques like Wim Hof breathing can be used to offset or prevent bacterial or viral infections by bolstering the immune system. However, these may be detrimental if you are already contracting or have contracted an illness.

Should I take cold showers or cold plunges in winter if I'm concerned about getting sick?

While cold exposure can have immune benefits, it's advised to be cautious if you are already coming down with a cold or virus. The video suggests that if you are already sick, extreme cold exposure might be the worst thing to do.

What is the purpose of a fever?

Fever is an adaptation by the immune system designed to heat up and destroy viruses. While dangerously high fevers can be harmful, blunting a slight fever may allow a virus to proliferate more readily.

Key Moments

AMA #13: Winter Months & Sickness, Wim Hof Breathing & Stressors

Andrew Huberman

Science & Technology4 min read25 min video

Nov 30, 2023|182,720 views|4,753|290

andrew huberman huberman lab podcast huberman podcast dr. andrew huberman neuroscience huberman lab andrew huberman podcast the huberman lab podcast science podcast

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Key Moments

TL;DR

Winter increases colds/flu due to indoor proximity and dry air affecting nasal passages.

Key Insights

Winter months see higher cold and flu prevalence due to shorter days and colder temperatures leading to more indoor time.

Increased indoor proximity to others is a primary driver of cold and flu transmission.

Dry indoor air, often from heating, compromises nasal passages, a key defense against infection.

Nasal breathing is crucial for maintaining healthy nasal passages and resisting viral infections.

Maintaining humidified air, especially at night, supports respiratory health and defenses against illness.

Cold exposure and specific breathing techniques may offer benefits but could be detrimental if already ill.

THE WINTER INCREASE IN COLDS AND FLU

Research consistently shows a higher incidence of colds and flu during winter months. This phenomenon is linked to several factors, including shorter days and colder temperatures. These conditions naturally lead to people spending more time indoors, increasing their proximity to others who may be infected. The reduced daylight also plays a role, though its direct link to increased illness is less about the light itself and more about the associated environmental changes like temperature and indoor behavior.

THE ROLE OF PROXIMITY AND INDOOR LIVING

A significant factor contributing to winter sickness is the increased physical proximity of individuals when they gather indoors. Studies demonstrate a direct correlation between how close one is to an infected person and the likelihood of contracting a cold or flu. This proximity extends beyond airborne particles from sneezing and coughing to include touching contaminated surfaces and skin-to-skin contact, highlighting the importance of physical distancing when ill.

IMPACT OF DRY AIR ON RESPIRATORY HEALTH

Heating indoor environments during winter often results in drier air. This dryness can be detrimental to the nasal passages, which act as a primary defense against viral and bacterial infections. The mucosal lining and nasal hairs are crucial for trapping pathogens. When these passages become dry, their ability to trap and neutralize incoming infections is compromised, making individuals more susceptible to illness.

THE IMPORTANCE OF NASAL BREATHING

Nasal breathing is strongly advocated for maintaining the health and resistance of the respiratory pathways. The nasal passages are equipped with physical barriers like hairs and a mucus lining that traps pathogens. Furthermore, the nasal passages help humidify and filter the air before it reaches the lungs. Mouth breathing, especially when prolonged or in dry conditions, bypasses these protective mechanisms, increasing the risk of infection.

HUMIDIFICATION AND AIR QUALITY

To counteract the drying effects of indoor heating, humidifying the air is recommended, particularly during sleep. While humidifiers won't entirely prevent transmission from an infected individual, they help maintain optimal moisture levels in the nasal and oral passages. This supports the body's natural defenses, ensuring that the respiratory system is better equipped to ward off any viruses or bacteria encountered, thereby potentially reducing the severity or duration of illness.

CORE BODY TEMPERATURE AND IMMUNE RESPONSE

There appears to be a relationship between core body temperature and susceptibility to illness. While fevers are a natural immune response designed to combat viruses by increasing body temperature, a significant drop in core body temperature due to cold exposure might impair the immune system's effectiveness. The practice of warming up after cold exposure, such as through hot showers or saunas, is thus beneficial for restoring optimal immune function.

SPECIFIC BREATHING TECHNIQUES AND COLD EXPOSURE

Deliberate cold exposure and specific breathing techniques, like those associated with the Wim Hof method, are being explored for their potential health benefits, including immune system modulation. However, it's crucial to differentiate between preventative use and application when already experiencing symptoms. If an individual is already contracting or has contracted a bacterial or viral infection, these intense methods might actually be counterproductive or even harmful.

PREVENTION VERSUS TREATMENT CONSIDERATIONS

While strategies like nasal breathing and humidifying air are beneficial for prevention and supporting the immune system, their role during an active infection needs careful consideration. The body's fever response, for instance, is a mechanism to fight pathogens. Blunting such responses too readily might inadvertently favor the proliferation of viruses. Therefore, a nuanced approach is necessary, balancing symptom relief with supporting the body's innate healing processes.

THE 'HUBERMAN LAB' PREMIUM CHANNEL

The AMA format is part of the Huberman Lab Premium channel, launched to support the free weekly podcast and fund scientific research, particularly human-based studies. A matching program with the Tiny Foundation doubles research contributions. Premium subscribers gain access to full AMAs, transcripts, and exclusive content, all while supporting vital scientific advancements in mental, physical, and performance health.

Mentioned in This Episode

●Software & Apps

●Organizations

●Studies Cited

●Concepts

●People Referenced

Winter Cold & Flu Prevention Guide

Practical takeaways from this episode

Do This

Prioritize nasal breathing whenever possible.

Humidify indoor air, especially at night.

Maintain a healthy core body temperature; consider warming up after getting cold.

Consider distancing from individuals who are actively sneezing or coughing.

Wash hands regularly, especially after touching surfaces or wiping your nose.

Avoid This

Do not breathe primarily through your mouth unless exercising intensely, speaking, or eating.

Do not assume you are not contagious if you are sneezing or coughing.

Do not excessively reduce your core body temperature with extreme cold exposure if already sick.

Be cautious about taking medication to lower a fever, as fever is an immune response.

Common Questions

During winter, shorter days lead to less sunlight, and colder temperatures cause people to spend more time indoors in closer proximity. Additionally, indoor heating dries out nasal passages, which are a primary defense against infection.

Topics

Cold Exposure Health & Longevity Neuroscience & the Brain Science & Mathematics Immune System Nasal Breathing Viral Transmission Medicine & Clinical Winter Health Respiratory Health Fever Management

Mentioned in this video

Studies & Research

Association of oral breathing with dental malocclusions and General Health in children

A paper discussed in relation to the health impacts of nasal versus mouth breathing, noting increased susceptibility to illness with oral breathing.

People

Andrew Huberman

Professor of neurobiology and ophthalmology at Stanford School of Medicine and host of the Huberman Lab podcast.

Concepts

Wim Hof breathing

A type of deliberate breathing technique mentioned in the context of cold exposure and its potential effects on immunity.

Organizations

Huberman Lab Podcast

A podcast that discusses science and science-based tools for everyday life, with Andrew Huberman as the host.

Stanford School of Medicine

Andrew Huberman's affiliated institution where he conducts research and teaches.

Tiny Foundation

A foundation that matches funding for research studies conducted via the Huberman Lab premium channel.

Software & Apps

HubermanLab.com

The website where users can subscribe to the Huberman Lab premium channel and find more information.

Locations

Tromsø, Norway

Mentioned as an example of a location with extreme variations in daylight hours between winter and summer.

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