AMA #13: Winter Months & Sickness, Wim Hof Breathing & Stressors
Dr. Andrew Huberman discusses why colds and flus are more prevalent in winter, focusing on factors like proximity, indoor heating, and dry air. He provides actionable insights on nasal breathing, humidification, and hygiene to prevent illness.
Deep Dive Analysis
8 Topic Outline
Reasons for increased colds and flus in winter
Impact of physical proximity on cold and flu transmission
Contagiousness of symptomatic individuals with colds or flus
Role of indoor heating and dry air in respiratory health
Nasal passages as the body's primary defense against infection
Benefits of nasal breathing for preventing respiratory illnesses
Strategies for maintaining respiratory health and resisting infection
Understanding fever as an immune system adaptation
2 Key Concepts
Nasal Passages as Defense
The nasal passages are a primary site of defense against viral, bacterial, and fungal infections. They contain hairs, a mucosal lining that physically traps pathogens, and a thriving microbiome, all of which work to prevent infections from entering deeper into the body.
Fever as Immune Response
Fever is an adaptive response by the immune system to combat infections. It involves heating up the body to destroy viruses, and blunting this natural response with medication might allow a virus to proliferate more readily, though highly elevated fevers can be dangerous.
5 Questions Answered
The increased prevalence of colds and flus in winter is due to shorter days (meaning less sunlight), colder temperatures, and people spending more time indoors, which increases physical proximity and exposure to drier, heated air that can compromise nasal passage defenses.
Yes, anytime someone is sneezing or coughing due to a cold or flu, they are in fact contagious, regardless of their personal theories about their stage of illness, as this is substantiated by actual data.
Indoor heating tends to dry out the air, which in turn dries out the nasal passages. Since nasal passages are a primary defense site against infections, their dryness can compromise this barrier and make one more susceptible to illness.
Nasal breathing is extremely important because the nasal passages contain physical barriers like hairs, a mucosal lining that traps pathogens, and a protective microbiome, all of which defend against infections. Mouth breathing bypasses these crucial defenses, increasing susceptibility to respiratory illnesses.
While highly elevated body temperatures can be dangerous and require treatment, fever is an adaptation designed by your immune system to destroy viruses. Blunting a fever might actually allow the virus to proliferate more readily than if a slight fever were allowed to combat it.
10 Actionable Insights
1. Prioritize Nasal Breathing
Prioritize nasal breathing whenever possible (unless eating, speaking, or exercising hard) because nasal passages are a primary defense site against viral, fungal, and bacterial infections, with hairs, mucus, and microbiome trapping pathogens and protecting deeper physiology.
2. Humidify Indoor Air
Use an air humidifier in indoor environments, especially at night, to keep nasal passages and respiratory pathways sufficiently humidified and healthy, as dry air (common with indoor heating) compromises their defense against colds and flus.
3. Maintain Distance from Sick
Maintain physical distance from individuals who are sneezing or coughing, as physical proximity directly increases the probability of contracting a cold or flu.
4. Assume Contagiousness When Coughing/Sneezing
Assume anyone who is sneezing or coughing due to a cold or flu is contagious, regardless of their claims about being early or late in their illness, as data suggests they are contagious whenever these symptoms are present.
5. Thorough Hand Washing
Wash your hands thoroughly after wiping your face or nose, or using tissues, especially if you are sick, to prevent transmitting cold or flu viruses through contact like handshakes.
6. Prevent Spreading Illness
If you are sick with a cold or flu, avoid attending events or being in close proximity to others to prevent transmitting your illness, as it is considered polite and responsible to try and not get others sick.
7. Cover Coughs and Sneezes
Cover your mouth and nose when sneezing or coughing, ideally into your elbow if a tissue is unavailable, to prevent the spread of germs to others.
8. Rehydrate After Cold Exposure
After exercising outdoors in cold, dry weather, rehydrate your nasal and oral passages (e.g., with a hot shower, steam room, or humidifier) before going indoors and being around others, as dried passages increase susceptibility to illness.
9. Warm Up After Chill
If you experience a chill from being outside in cold weather, warm up by taking a hot shower, bath, or using a sauna upon returning indoors, as there’s a relationship between core body temperature and susceptibility to cold and flu.
10. Understand Fever’s Role
Recognize that fever is an adaptive immune response designed to heat up and destroy viruses; consider this when deciding whether to take medication to lower a fever, while also being aware of the dangers of highly elevated body temperatures.
3 Key Quotes
Anytime someone is sneezing or coughing, they are in fact contagious.
Andrew Huberman
There's actually not many things ruder than someone who knows that they're sick showing up to something because they didn't want to miss that particular event and getting everybody else sick, frankly.
Andrew Huberman
Fever is an adaptation designed to destroy viruses.
Andrew Huberman
1 Protocols
Protocol for Maintaining Respiratory Health and Reducing Cold/Flu Susceptibility
Andrew Huberman- Practice nasal breathing whenever possible, except when eating, speaking, or exercising hard.
- Use an air humidifier, especially at night, to ensure the air you breathe is sufficiently humidified and to prevent nasal passages from drying out.
- Maintain physical distance from people who are actively coughing or sneezing due to a cold or flu.
- If exercising outdoors in cold, dry weather, be aware that air passages may dry out, and rehydrate them afterwards (e.g., by taking a hot shower or using a steam room).