carbonation
Some people can tolerate them and others can't. From what I've heard it is possible that it may stretch the pouch. I drink carbonated drinks every now and again but I let it sit in lots of ice and allow the "bubbles" to escape first.
People are so worried about what they eat between Christmas and the New Year, but they really should be worried about what they eat between the New Year and Christmas. ~Author Unknown
From what I have read unless you drink about 40 ounces of coke a day, it won't stretch your pouch.
When you drink carbonated beverages, the concern is that the gas from the carbonation will stretch out your pouch. However, the pouch is NOT an isolated closed bit of stomach. It has two openings, and if you have some gas it will pass one way or the other. Nevertheless, for safety sake—if your surgeon says no carbonation—then do not drink carbonated beverages.
Hope this helps...............