At a glance
WHAT IT’S REALLY ABOUT
Science-Backed Strategies To Prevent, Fight, And Shorten Colds, Flus
- Andrew Huberman explains what cold and flu viruses are, how they infect the body, and how the immune system’s three lines of defense—barriers, innate immunity, and adaptive immunity—work to fight them.
- He details how colds and flus spread (especially via the eyes, nose, and mouth), debunks myths about contagion and weather, and emphasizes behaviors that significantly reduce infection risk.
- The episode outlines evidence-based protocols involving sleep, exercise, nasal breathing, gut health, sauna use, and selected supplements (notably zinc and possibly N‑acetylcysteine) to bolster immunity and shorten illness duration.
- Huberman also clarifies where common interventions like vitamin C and echinacea fail to live up to the hype, and stresses not over‑training or using heat stress when already sick.
IDEAS WORTH REMEMBERING
5 ideasAvoid touching your eyes, nose, and mouth—especially after handshakes and shared surfaces.
Cold viruses can live on surfaces for up to 24 hours (flu ~2 hours). Skin is an excellent barrier, but infection occurs when virus is transferred to mucosal entry points, particularly the eyes and then the mouth. Behavioral studies show people almost always touch their eyes/face shortly after shaking hands. Increasing awareness, washing/sanitizing hands before face-touching, and considering hand sanitizer after social contact can materially reduce infection risk.
Prioritize high-quality sleep and moderate, well‑dosed exercise to keep innate immunity strong.
Sleep deprivation and overtraining both suppress the innate immune system, increasing susceptibility to colds and flus. Regular exercise of ≤60 minutes at moderate to high intensity boosts natural killer cells, T cells, and beneficial cytokines, enhancing baseline immune readiness. By contrast, very long or extreme sessions (e.g., marathons, double sessions, >75–90 minutes hard work) temporarily depress immune function and raise stress/inflammatory markers to levels that increase infection risk.
Become a default nasal breather to leverage the nasal microbiome and temperature effects.
The nasal passages have a specialized mucosal lining and microbiota that are particularly effective at neutralizing inhaled viruses. Nasal breathing warms and conditions air in ways that reduce viral embedding in mucosa. Mouth breathing—especially habitual mouth breathing during sleep—is associated with more upper respiratory infections in both children and adults. Consciously favor nasal breathing when not talking, exercising intensely, or eating, and address chronic mouth breathing if present.
Use targeted exercise and sauna when well—but avoid both when you’re already sick.
When you feel healthy, daily or near‑daily exercise (20–60 minutes; one shorter HIIT session ~12 minutes weekly) and regular sauna use (e.g., 2–3 rounds of 15 minutes at ~176–210°F with brief cool‑offs) can upregulate leukocytes, natural killer cells, and heat shock proteins, priming innate immunity. However, if you already feel malaise, heavy limbs, throat tickle, or early cold/flu symptoms, pushing workouts or intense heat exposure increases stress load, impairs immune response, and tends to prolong or worsen illness. In that state, hot showers and extra rest are preferred.
Support your microbiome through low‑sugar fermented foods and simple oral–gut practices.
A diverse gut—and nasal/oral—microbiome is tightly linked to robust immune function. Consuming 2–4 daily servings of low‑sugar fermented foods (e.g., refrigerated sauerkraut/kimchi, live‑culture yogurt, kefir, low‑sugar kombucha, brined pickles) improves microbiota diversity and immune support. A simple, no‑cost protocol: on waking, before brushing teeth, swish and swallow a small amount of water to move oral microbiota into the gut, potentially seeding beneficial strains (logic‑based, but not yet supported by randomized trials).
WORDS WORTH SAVING
5 quotesIf you are still exhibiting symptoms of the cold or flu, you are contagious.
— Andrew Huberman
The primary entry sites for viruses to get into the body tend to be the eyes or the mouth.
— Andrew Huberman
We are literally bringing the virus to ourselves.
— Andrew Huberman
Exercise is a very potent tool… but it is a form of stress that induces adaptations.
— Andrew Huberman
If you’re already sick and you have the symptoms of a cold or flu, you want to limit the amount of stress to your body. You do not want to exercise.
— Andrew Huberman
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