Researchers at Duke University analyzed daily energy expenditure in 4,213 adults across 34 populations — from Hadza hunter-gatherers in Tanzania who walk 10+ miles per day to office workers in Norway who spend most of their day sitting. Using “doubly labeled water,” the gold standard for measuring calories burned, they tracked precisely how many calories each person burned per day. And the results shocked everyone — including the researchers. 🔥 People around the world burn