BecomeMe

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Pontzer's research suggests that exercising more doesn't necessarily help you burn more calories, as the body finds sneaky ways to adapt by cutting energy use elsewhere.

But what makes exercise ineffective for weight loss might explain why it's so good for our health — working out could divert excess energy from potentially harmful bodily processes like inflammation and stress, according to Pontzer.

That theory falls apart in the face of new data Pontzer obtained from working with the Hadza, a group of indigenous inhabitants of Tanzania, who walk miles each day as part of a traditional hunter gatherer lifestyle.

Pontzer and his team were stunned to find that they burn only slightly more calories each day than the average sedentary American adult, far fewer than expected given their very high activity levels.

According to Pontzer's data from the Hadza and other groups, your body wants to stick to the same calorie budget whether you're training for a marathon or chilling on the couch — what he calls "the constrained energy framework."

Your immune system, for instance, is important for keeping you alive, but can cause damage if it's overactive, leading to issues from allergies to autoimmune disorders.

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