To achieve weight loss you need to consume less calories than you expend. Eating less can certainly help. However, when people restrict calories too much they often lose lean body mass. A loss of lean body mass is not desired because it weakens the organs and muscles, and also slows down metabolism. Research has also shown that the combination of both diet and exercise leads to much greater weight loss. Exercise also appears to be the best predictor of long-term weight management.
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