Fasting is a great way to get a host of disease. If you must fast, do it in spurts not all at once. And inbetween eat fruits and veges, plus lots of fresh juice. vegetable and fruit juice is filled with nutrients your body needs and can uses. If you are going to fast, go on a JUICE FAST. Their are many books written on the subject. You can even make pulp cookies out of the pulp for fiber. YOU NEED NUTRITION.