The more muscle tissue you have, the more calories you will burn. This is why world class weight lifters must eat thousands of calories a day to maintain their weight. Muscle is active tissue, fat is not. Thus, muscle "burns" a significant number of calories each day for its own maintenance. In her book Strong Women Stay Slim, Miriam Nelson, a Tufts University researcher, showed that a group of women who followed a weight loss diet and did weight training exercises lost 44% more fat than those who only followed the diet. While aerobic activity can help burn calories, muscle's where it's at when it comes to giving your metabolism a significant daily boost even at rest.
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