How Your Immune System Works & How to Improve It | Dr. Max Krummel

About this video

Huberman talks with UCSF immunologist Dr. Max Krummel about how the immune system works and how to improve it. Krummel uses a wartime submarine analogy for self versus non-self discrimination: crews kept sound profiles of friendly and enemy submarines and fired only on the latter, much as, he suggests, the immune system must distinguish self from non-self, a problem he says gets harder with aging as the body becomes more complex and varied. Huberman frames the episode around why sleep deprivation makes people prone to sickness, including specific cells that need to migrate during sleep, and around evidence Krummel discusses that brain states and memories can be linked to the immune status present when those memories formed, so recalling them can activate the immune system similarly. The conversation also covers vaccines and medications candidly, and the origins of cancer immunotherapy: Krummel recounts an early mouse experiment in which an antibody he made activated T cells and tumours melted, work from the lab whose advisor later won the Nobel Prize, as he describes it.

Key takeaways

• Dr. Krummel compares immune self versus non-self discrimination to submarine crews identifying friendly and enemy sound profiles.
• Krummel argues that aging makes self versus non-self discrimination harder as the body becomes more varied.
• Huberman frames sleep as supporting immune function through specific cell migration during sleep.
• Krummel discusses evidence, as Huberman presents it, that recalling memories can reactivate a linked immune status.
• Krummel recounts an early T-cell antibody experiment in mice as an origin of cancer immunotherapy.

Episode details: published August 3, 2026 · 128.5K views · 2:27:41 long. Summary written by Self Growth Videos from the episode itself. The science and protocols described are Andrew Huberman’s, presented for education — not medical advice. Consult a qualified professional before changing your own health practices.

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