How exactly does the hcg diet work ?

Most people believe: the reason it "works" is because of the severe calorie restriction--500 kcal/day-- associated with it. Theoretically, HCG may exert some appetite suppressant qualities which make it easier to only eat 500 calories. A pregnancy hormone,HCG is a pro-hormone and may promote other hormones, i.e. thyroid. Most authorities are skeptical of its safety and effectiveness. Target: 1200 cal/day + exercise.