A true orange juice fast uses filtered fresh juice only. One Dr. used 1 pint, the other 8 oranges. I like both, the 8 orange a day is simply to remember. It is easy to do, but anyone that tries and doesn't know what to do, will fail. Few people have ever been able to fast for more than 1-2 days, this method I have seen many fast 21 days + their very first time! The brain has to read books and when accepted, then the person should attempt it, it is not something you just try, you either do it or not.