Why We Shiver: Your Body's Built-In Heater

Ever started shaking the moment you stepped out into the cold? That’s your body’s

built-in heater kicking in! When your body temperature drops, your brain’s hypothalamus

sends a message to your muscles. Your muscles start to contract and relax rapidly that’s

what causes the shaking. All that movement generates heat and helps raise your

body temperature back to normal. Even babies shiver less they have brown fat that

burns energy to stay warm without moving! So the next time you’re shivering,

don’t fight it that’s your body working hard to keep you alive!