I urge people to stay away from fad diets like these. This particular diet is based on the completely ludicrous idea that certain foods are bad for one's blood type. In addition, the suggestions often contradict good diet sense and the result is an unhealthy diet.Some people may feel better on this diet, but dietary change is a mainstay of treating IBS. Your best bet to do that, however, is to consult a dietician and ignore a phony book like this one.