Fasting has been around since recorded history. It ends up this is a normal part of your metaabolic processes. It has been used for weight loss, treatment of disease, and a method to get a deeper understanding of complex ideas.. Everyone should fast for 12 hours form the last meal at night to the first meal in the morning, just like people have done since the beginning. This is normal. I will explain why you should fast. Therpeutic fasting is for weight loss, and I will advise you how to do this. If you read this book, you will try to fast. I will go over the "fear of fasting" Autophagy is the method by which the cells in your body renew themselves. We want more of this. Fasting encourages autophagy. Autophagy means self-eating.