The HCG Diet is a medical diet using low doses of HCG in combination with a low fat 500 calorie per day diet for a period of 23-43 days followed by a three week period of “No Starch/No Sugar” stabilizing phase. After the HCG Diet, the dieter can expect to have an improved metabolism and maintain weight more easily than after a traditional low calorie diet and expect weight loss of up to a pound a day on average.