I Ate 1000 Sardines in 30 Days — The Big Surprise

Radical Dietary Experiment: Becoming Cold Resistant00:03

Did a radical dietary experiment and became cold resistant. Could take shirt off in icy Boston winter and feel comfortable. Blasts of frigid air felt like a cool summer's breeze. Food is not just fuel; it's raw material for hormones. Changing diet changes hormones, including those that turn stored energy into heat, revving up metabolism. Accidentally turned mitochondria into thermogenic beast mode, like flipping a switch.

High-Level Mechanism and Sardine Diet Experiment00:30

Became conspicuously cold resistant due to metabolically active brown fat, secret superpowered hormones in a loop of metabolic dysfunction. Lens to reframe obesity: activating this pathway in humans drove a metabolic shift. What we eat is information for our bodies; right nutrients unlock ancient pathways.

Self-experiment: sardine diet—ate 1,000 sardines in a month as base of diet. Girlfriend hated it: >> You smell like fish. Like, you smell like you're sweating this way. << Persisted to jack up omega-3 fats from fatty fish like sardines. Blood omega-3 levels broke the human scale; fatty acid composition became more dolphin than human.

After a couple weeks on extremely high omega-3 sardine diet, became conspicuously cold resistant. In Boston winter with naked trees and biting wind, walked outside happily shirtless. Unexpected effect: haven't been getting cold, especially outside. Felt refreshing when it should have felt frigid.