In prehistoric times, you would have emerged from a cave to survey the landscape for food. For survival, your brain would have urged devouring anything you could kill or uproot.
Yet, when you weren't out hunting sloths, you would have become one for similar reasons. "When we didn't need to get food, we saved energy," says Paul M. Thompson, M.D., director of the preventive-cardiology program and of cardiovascular research at Hartford Hospital, in Connecticut. "That was how you survived—you didn't waste energy."
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