Dr. Martin Picard on Huberman Lab: Why stress grays hair

Picard argues we are fundamentally the flow and transformation of energy through a biological structure; when energy stops flowing (as in a cadaver) the physical parts remain, but life and experience disappear. This shift in perspective helps explain why mindset, behavior, and context so strongly affect health, mood, and aging.

Whether lifting weights, learning a skill, or facing life transitions, progress requires pushing against resistance (energetic demand) and then releasing it so tissues and circuits can rebuild. Chronic, unrelenting resistance (stress) without adequate rest or sleep raises energetic resistance in mitochondria and leads to breakdown, not adaptation.

Picard’s lab showed individual hairs can go from pigmented to gray and back again, and that gray segments often line up in time with intense stress periods that later resolve. This challenges the view of aging as a one-way decline and suggests some hallmarks of aging are dynamic responses to energetic and psychological load.

Large-scale studies suggest only ~7–10% of lifespan is explained by inherited genes; ~90% comes from environment, behavior, and lived experience. How you sleep, eat, move, manage stress, and find purpose likely shapes mitochondrial function and the pace of aging far more than your DNA.

Excess calories push too many electrons through mitochondrial pathways, raising energetic resistance and reactive byproducts, while chronic inflammation and senescent cells constantly consume energy and send distress signals. This leaves less energy for growth, maintenance, and repair (GMR), making people feel tired, inflamed, and old despite abundant caloric intake.