¿They work together to make fasting as a therapeutic technique both realistic and understandable. According to The Complete Guide to Fasting: ¿ who can benefit from fasting (and who won't) ¿ the history of fasting ¿ the several methods to fast: intermittent, alternate-day, and prolonged fasting ¿ what to anticipate when beginning to fast ¿ how to measure progress while fasting