What Happens to Your Body When You Yo-Yo Diet

 3.Your Hunger on Overdrive
Your fat cells make a hormone called leptin. It tells your brain when you have enough fat stored up. As you lose weight, less fat means less leptin. That makes you hungry. Plus, your body slows things down to save energy. So once you quit the diet, you have an oversized appetite but you burn fewer calories. That’s partly why after several cycles of yo-yo diets, you might weigh more than when you started.

4.More Fat, Less Muscle
When you drop pounds from your body, you lose both fat and muscle. When you gain it back, fat gets the fast lane and builds up first. But your appetite stays in high gear until your muscle returns, which means you keep adding fat, too. Oddly, this seems more of a problem for lean people than those who are overweight. Repeat the cycle over and over, and you get the triple whammy of more weight and fat and less muscle.