While losing weight is difficult for many people, it is even more challenging to keep the weight off. Most people who lose a large amount of weight have regained it 2 to 3 years later. One theory about regaining lost weight is that people who decrease the amount of calories they consume to lose weight experience a drop in the rate their bodies burn calories. This makes it increasingly difficult to lose weight over a period of months. A lower rate of burning calories may also make it easier to regain weight after a more normal diet is resumed. For these reasons, extremely low calorie diets and rapid weight loss are discouraged.
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