I have indivduals overfeeding/cheating anywhere from once every 3-4 days to once every 7-8 days while on moderate to severe diets. Overfeeds range from 8 hours to 36 hours, high carb/low fat to all out binges (based on the individuals past experience). Most find that it helps tremendously in regards to LBM retention while dieting, is much easier psychologically, serves as motivation to give 100% during the strict portion of the diet, and actually accelerates their rate of fat loss. This has been the consensus of 90% of people that I have worked with and many, many individuals that I have not directly worked with, but have conversed with regarding the topic.
Berardi is actually using my CD/EDT approach with a number of his clients and has informed me that they all are doing quite well. Lastly, let me just say that you shouldn’t really develop an opinion on the subject until you have tried a somewhat planned/scientific approach, as opposed to just eating some pizza every once in a while.