You lose fat but very little and along with the fat you lose muscle and some amount of water. The higher you reduce your calorie intake, the faster you drop weight and the more muscle mass you lose. Do know your muscle matters? Loss of muscle affects your health and your overall appearance. As the body loses more muscle mass, the body's overall metabolic rate decreases. The metabolic rate is the rate at which the body burns calories and is partly determined by the amount of muscle you have. So the more muscle you have, the higher your metabolic rate; the less muscle you have, the lower your metabolic rate and fewer calories you burn. This explains why it is crucial to protect your metabolic rate and not have muscle loss.
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