> It says the Hadza's bodies have adapted to perform a more exhausting task with less energy expenditure than US-Americans need. You're not wrong, but I'd see

> It says the Hadza's bodies have adapted to perform a more exhausting task with less energy expenditure than US-Americans need. You're not wrong, but I'd see it as the Americans who've adapted to more recent situations. Not walking ten miles a day is a relatively new phenomenon.