Why exercise alone may not cause weight loss.

Gretchen Reynolds points to work by Lark et al. showing that mice given the opportunity to exercise on a running wheel then are more lazy the rest of the time than mice who don't exercise. Thus the effects of voluntary exercise can be countered by a reduction in nonexercise activity. This may explain why numerous studies in recent years examining exercise and weight loss in both humans and animals have concluded that exercise, by itself, is not an effective way to drop pounds.

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