CHICAGO, Illinois (AP) -- Overweight adults who are not on a diet need only a small amount of exercise -- the equivalent of a half-hour of brisk walking per day -- to prevent further weight gain, a study found.

The most noticeable weight loss occurred in those who did the most vigorous exercise -- jogging about 17 miles weekly. They lost an average of nearly eight pounds over eight months, and also shed more than 10 pounds of body fat and gained about 3 pounds of lean body mass on average.

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