When you gain weight for no obvious reason, it may be linked to hormone fluctuations. These changes can occur with age, menopause, or a medical issue. Changes in hormone levels can affect major body ...

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Young Hispanic female intensely pedals a stationary bike in a gym. She wears a blue sports bra and white pants, surrounded by gym equipment, under warm gym lighting. When Herman Pontzer began ...

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.