I was once diagnoses with IBS and since low carbing (I am on South Beach since December 03) I haven't had problems at all. I don't know what it was but my guess is something in normal bread. I would say same as above - go to maintenance - cut out REFINED carbs (soft drinks, white bread, white rice) and be generous with whole grain carbs - beans, humus, whole grain breads or pasta, lots of veggies, low fat meat. I also think the low FAT part of SBD might help acne.