A physically active lifestyle or hard exercise taken regularly every day make losing weight and staying slim very much easier. According to Science Digest (94#4:41), these beneficial effects are due to the fact that muscular activity burns up the body’s fat stores while at the same time increasing the bulk of its muscles.

Muscle is a much more active tissue than fat and, pound for pound, has more cells and needs more calories just to maintain itself. Thus, people who have replaced fat with muscle develop a much more active metabolism that burns up more calories at rest and helps them to stay slim.

Dieting without exercise, on the other hand, results in loss of both fat and muscle tissue, and when the dieting is over, lost weight is quickly regained. Worse yet, weight regained under these circumstances is mostly due to fat. Cyclic loss and gain of weight due to dieting without exercise results in a new loss of muscle tissue that makes slimness even more difficult to attain in the future.

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