Unfortunately, severe and prolonged dieting shuts down the metabolism, sending the body into starvation mode. The fat cells begin sending out even more fat-storing enzymes and a significantly smaller amount of fat-releasing enzymes. Because the fat cells are afraid of being starved to death and depleted of their stores, they will hold on to the fat they have to the best of their ability, causing the body to start burning lean muscle mass to get the amount of fuel it needs.
Lean muscle mass, located in the skeletal muscles and the organ systems, is the metabolically active part of the body. This means that after the diet is over and your body is out of starvation mode, your metabolism will still not function as well as before the diet, because you have lost some of your muscle mass, which was the engine driving your metabolism.
Here’s an example of healthy skin and skin with cellulite.
In addition, the effects of restrictive dieting on your fat-storing and -releasing enzymes can be permanent. Though the levels will return closer to a normal level after the diet, the fatreleasing enzymes will almost always be at a slightly lower level than before the diet, and the fat-storing enzymes will almost always be at a slightly higher level. Even worse: the effects are cumulative. This means that after each successive bout of dieting, it will be harder and harder for you to lose fat and control your weight for the long term.