A: No. Q: Our metabolisms slow down in middle age. A: No. Q: Exercising more means we’ll burn more calories. A: Your metabolism is all the work that all 37 trillion of your cells do every day.
When Herman Pontzer began studying the metabolisms of the Hadza, a tribe of modern hunter-gatherers in Tanzania, for a 2012 study, he assumed they’d be incinerating calories like a furnace. They were ...