text: there is nothing wrong in letting your child eat mcdonalds on occassion. let your child be a child as far as stuff like this goes.\nmy son has IBS and that is why antidepressants didnt work for him as IBS is linked to the lack of a certain enyme in the gut that regulates the serretonin in the brain.\njust with diet alone we have almost eliminated his outbursts. no more medication for my son! lactose intolerent was a problem for my son in the beginning. we tried otc chewables for a while. that seems to reverse his type of IBS into constipation type IBS. I would take him off the enzymes for the ibs and just watch his diet. but please at least once a week, if its mcdonalds or a small bag of skittles, let him indulge.