Kiwi that is probably a good guess but if that's the correct analysis it's not the J pouch that's is causing the issue, it's the shortened intestinal tract and the issue will presumably be exactly the same whether you have a J pouch or an ileostomy bag. That being said, it's curious that some have these issues after colon removal and some do not. Some can eat the same as before surgery but perhaps with some issues in fully digesting fruits and vegetables. Some have to change their diets. There is no common result on digestive issues- my experience both here and in the IBD support groups I have belonged to is it's all over the board as to what people can eat and digest well. It's a very individual thing and no general consensus can be reached on what can or cannot be eaten.