How to Prevent & Treat Colds & Flu
Explore the intricate biology behind colds and flu, including how the immune system fights these viruses. Discover effective strategies like nutrition, sleep, and exercise to boost immunity. Separate fact from fiction regarding common myths about transmission and contagion. Learn which supplements, including vitamin C and zinc, may actually help. Plus, find out how sauna use can enhance your body’s defenses. This engaging discussion is packed with actionable advice to prevent and recover from respiratory infections.
Top snips
Colds vs. Flu — the basics
6:00 – 7:28
Colds are mostly rhinoviruses — >160 serotypes — so no single cure. Flu (influenza) has fewer strains (A, B, C), which is why seasonal flu shots exist and can reduce risk by ~40–60% for targeted strains.
Know the difference to choose prevention: vaccines for flu; behavior + support for colds.
How colds & flus spread (myth-busting)
7:56 – 11:04
Cold/flu spread via aerosols, droplets, and contaminated surfaces — then we touch eyes, nose, or mouth.
The cold virus is made up of particles that are probably in the range of about five microns or so.
— Andrew Huberman
Cold weather ≠ direct cause; indoor contact and hand→face transfer do most transmission.
Immune system: 3 lines of defense
30:44 – 32:57
- Physical barriers: skin, mucosa, tears.
- Innate immune system: fast, non-specific (neutrophils, NK cells, cytokines).
- Adaptive immune system: specific antibodies (IgM → IgG) + memory.
Strengthen the first two to often stop infections before antibodies are needed.
Everyday behaviors that reduce risk
1:00:41 – 1:08:16
Practical, science-backed tools:
- Sleep: enough nightly sleep to avoid immune impairment.
- Nasal breathing: preserves nasal microbiome and traps pathogens.
- Gut microbiome: 2–4 servings low-sugar fermented foods/day or probiotics.
Small habits shift infection probability substantially.
Exercise & sauna: dose matters
1:21:43 – 1:40:46
Good: ≤60 minutes moderate→high intensity (or short, intense HIIT) boosts innate immunity for hours.
Bad: prolonged extreme exercise (e.g., marathon) suppresses immune function.
Sauna (e.g., 3×15-min rounds with short cool breaks) raises leukocytes & cortisol — can enhance innate responses when used safely.
Supplements that help (and which don't)
1:46:48 – 1:54:06
Evidence-based picks:
- Vitamin D: 1,000–2,000 IU/day safe; test levels for higher needs.
- Zinc: ~90–100 mg/day (with food) can shorten colds.
- N‑acetylcysteine (NAC): 600–1,200 mg/day showed reduced flu-like illness in studies and is a mucolytic.
Vitamin C shows weak/uncertain benefit.