Dr. Andrew Huberman: How Breathing Activates Immunity

Skin and mucus-lined openings (eyes, nose, mouth, gut) are the first defense layer. A healthy mucus lining, maintained by a robust microbiome, filters and kills many pathogens before they penetrate deeper. Practical steps include avoiding unnecessary mouth breathing, minimizing eye touching after contact with surfaces/people, and preserving nasal health as a superior filtration route.

The microbiome spans eyes, mouth, nasal passages, gut, and rectum and differs by region. Consuming 2–4 daily servings of low-sugar fermented foods (e.g., sauerkraut, kimchi, natto, pickles) improves mucus quality, reduces pro-inflammatory cytokine activity, and lowers the burden of infection on body cells—meaning fewer 'help me' cytokine signals from stressed tissues.

Lethargy, reduced grooming, appetite loss, irritability, photophobia, and daytime sleepiness are coordinated via fast neural signals (notably the vagus nerve to the hypothalamus) and slower blood-borne cytokine actions in the brain. This suite of responses conserves energy, elevates body temperature (fever), and shifts behavior toward rest to help the immune system clear the infection.

During early infection, the brain’s glymphatic system becomes especially important for clearing inflammatory debris. Elevating the feet about 12° (e.g., a rolled pillow under your heels) during sleep or naps can increase glymphatic clearance. When you feel ill, hot showers, extended sleep, and sleeping with feet slightly elevated can collectively speed recovery.

A protocol of 3 rounds of 20–30 deep, rapid breaths followed by an exhale hold (lungs empty for 15–60 seconds) significantly boosted epinephrine and IL-10 (anti-inflammatory), while reducing pro-inflammatory cytokines (TNF-α, IL-6, IL-8) and flu-like symptoms in E. coli–injected subjects. This Wim Hof–style “cyclic hyperventilation with retention” is a zero-cost behavioral tool Huberman personally uses at illness onset to bolster immune response and blunt symptoms.