Have you read the book, Flux? It is not a diet. It is a suggested way of eating and not intended to be a weight loss diet, if that is what you are referring to. It covers a lot of physical problems. I have talked to two drs. about it and they believe that it has merit. I don't follow it strictly, but follow some of the the guidelines. AND my IBS has improved immensely - episodes less frequent and less severe. Conincidence, maybe. However, I would not classify it as a "fad" diet.