The reason many programs don't want to allow for cheating, however, is that most people don't know when to stop. One cheat can lead to a bigger cheat that leads to an even bigger cheat, and then you're off the program. You have to be the judge of your discipline level. If you're someone who gets a taste of chocolate or french fries and can't stop yourself from eating the entire package or serving, then this method is not for you. You'd be better off following the program as closely as possible with a goal of staying away from those temptations that tend to lead you to overeat.
From The 4 Day Diet by Ian K. Smith, M.D. Copyright 2009 by Ian K. Smith, M.D.. Reprinted by permission of St. Martin's Press.