According to the book, you will be working with your own metabolism to burn off fat quickly and keep it off. This program is suitable for vegetarians and vegans and there are plenty of meat free options in the diet guide. The program differentiates between weight loss and fat loss. Usually the weight you lose on a diet is water weight and muscle, but you still retain your body fat. On this diet, you will learn how to build muscle so that your body burns more fat and becomes more defined.