This book explains the two basic types of fasting: water fasting and juice. It also explains the basic lengths of fasting: three day fast, seven to ten day fasts and longer therapeutic fasts. It goes over various techniques and methods of fasting and various professional opinions on fasting. It covers some of the detoxification methods that can be used during a fast such as colon therapy or enemas, dry brushing, and your tongue. The purpose of this work is three fold. First it is to give a basic scientific approach using some of the leading experts and research in the field, as well as Jim's own insights. Second is to give a practical approach that anyone can use to guide themselves on a fast under ten days or even to twenty one days. Third is to give some therapeutic fasting understanding and evidence. Also chapters on: Extending Lifespan with Fasting, Nutrition after the Fast, and Fasting Scriptures and Spirituality are included.