Depends who you ask. I did a 12 day fast once, nothing but water. I intended to do a 10 day fast, but I felt so wonderful, so healthy, so clear, that I decided

Depends who you ask. I did a 12 day fast once, nothing but water. I intended to do a 10 day fast, but I felt so wonderful, so healthy, so clear, that I decided to add 2 extra days. For those interested, most of the benefits (for me) happened after the 5th day. Thats when the hunger and caffeine withdrawal ended. I don't know all of the science behind it, but I can honestly say that I never felt better/healthier in my life.