More than 95 percent of crash dieters regain all the weight they have shed within a few years, if not months or weeks, only to go on another crash diet. This cycle of rapid weight loss followed by weight gain is called yo-yo dieting.
In some cases, yo-yo dieters put on more weight between diets than they had previously lost. One reason for this is that dieters tend to binge on fatty foods when they stop dieting, leading to accelerated weight gain. The answer is to avoid crash diets, develop sustainable diet habits, and choose starchy foods instead of high-fat products.