In a four-year study of 2,163 older adults, researchers found that for every 10 pounds of fat weight a person lost in a weight loss program, they also lost about four to five pounds of lean (primarily muscle) tissue. When you gain the weight back, however, you gain very little lean functional tissue (muscle)—it is almost all fat tissue. People who diet frequently (lose weight and gain it back) may be losing functional tissue and getting progressively fatter. During and following weight loss, aerobic and anaerobic exercise is the solution to maintaining muscle mass.
American Journal of Clinical Nutrition 2005:82.872-878 October 2005
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