This is the disadvantage of dieting and losing weight. Dieting to lose weight, the body lacks the calories needed for basic metabolism and consumes the calories stored in the body. The glycogen in viscera and muscles is consumed first. In other words, when you go on a diet to lose weight, you should first take muscle energy to supplement your body when you are hungry. Muscles support the lines of your body and become smaller. The remaining fat becomes soft without muscle support.