The diet plan that uses the hcg hormone to stimulate your metabolism to burn fat while maintaining muscle. The result? A muscle-toned body that sheds weight at a reported average of 1 pound per day. The hcg diet is the ultimate weight loss program that changes how your body loses weight. Using the "pro-hormone" hcg (human chorionic gonadotropin) to increase other hormones to maintain its own natural muscle, the body's metabolism is naturally stimulated to burn fat at an impressive rate.