For weight loss, less exercise might be more: Study

Multiple studies have found that without major changes to diet, exercise typically results in only modest weight loss at best. Quite a few exercisers lose no weight. Some gain.But there is encouraging news about physical activity and weight loss in a new study by researchers at the University of Copenhagen. It found that exercise does seem to contribute to waist-tightening, provided that the amount of exercise is neither too little nor, more strikingly, too much.

GM DietTo reach that conclusion, the Danish scientists rounded up a group of pudgy and sedentary young men, a segment of the population increasingly common in Denmark, as elsewhere in the world.

Negative CalorieThe volunteers, most in their 20s or early 30s, visited the scientists' lab to undergo baseline measurements of their aerobic fitness, body fat, metabolic rates and general health. None had diabetes, high blood pressure or heart disease and, while heavy, they were not obese.The men were then randomly assigned to exercise or not. The non-exercisers, who served as controls, returned to their former routines, with no change to their diets or sedentary ways.A second group began 13 weeks of almost daily moderate workouts, consisting of jogging, cycling or otherwise sweating for about 30 minutes, or until each man had burnt 300 calories, based on his individual metabolic rate.

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