They don't just walk. Their whole lives are physically demanding as they do everything by hand. The men hunt, the women forage. Everyone crafts their tools. Al

They don't just walk. Their whole lives are physically demanding as they do everything by hand. The men hunt, the women forage. Everyone crafts their tools. Also it's not just this study. Research on this actually started in the 1980s when the double labelled water method became practical - unfortunately it's still massively expensive. All in all there's a much larger body of research indicating that exercise is not effective at controlling weight. The Hadza study at least gives some clues and indicates that there's something we're missing and this mechanistic approach to metabolism where you can just coax it into burning more is a model that doesn't reflect reality.