isnt this called a mild form of dumping? allot of people dont vomit with dumping because the food has already gone past the pouch..i will copy what my sheet from the dietitian says about it:
Bowels normally return to normal after the operation, although diarrhoea is not uncommon to start with. This usually settles down as you restart solids. If it does not settle or it returns, look carefully at what you are eating. The most common reason is eating foods high in sugar such as sweets,chocolates,sweet drinks or sugar added to foods,or high in fat such as crisps,snack foods,chips,friend foods,cheese and fatty meats. Make sure you drink extra fluid if you do have diarrhoea until it settles, but avoiding sugary drinks. If your bowel motion become fatty,yellow and difficult to flush this is always due to eating too much fat, which has exceeded the body's ability to absorb it. It will settle if your diet is adjusted.
That is what my form says, i am not saying you arent sticking to the rules, but maybe there is something you are having that your pouch cant handle that you arent aware of .... sending hugs and kisses your way xxxxxx