The more you weigh and the more lean body tissue you have, the higher your metabolic rate will tend to be. Every diet trains the body to slow down using some lean tissue and not replacing all of it. This is because as soon as you return to normal eating after dieting, the body's need to regenerate causes cravings and extreme hunger. Once the glycogen and water have been replaced, the body of a sedentary person being used to fat will regain fat