Under HCG, fat is being extracted from the cells which is stored in fatty tissue. When these cells are empty they serve no purpose. The Body Breaks Down the Cellular Structure and absorbs it. Breaking up leftover useless cells, connective tissue, lood vessels, ect. May lag behind the process of fat extraction, the body appears to replace some of extracted fat with water. Water is heaver than fat. When the tissue is finally broken down, there is a flood od urine and a loss of weight.