Puffing through a park or panting along a highway, joggers are unquestionably helping their hearts. But are they shedding poundage as well? No, say three U.S. Air Force researchers in the A.M.A. Journal: exercise alone can't do it. A runner of medium weight who wishes to shed a pound of fat on a one-shot basis must expend 3,500 calories, which means that he must run for well over an hour.
Still, say the doctors, exercise is an important element of any weight-control program. The trio figured the actual caloric consumption for men of various...
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