There are many RNYers who drink diet soda post-op. There are a number of good reasons to avoid it (or minimize it), but do NOT believe anyone who tells you that it will stretch your pouch (or stoma) because that is NOT true.
10 years out; 190 pounds lost, 165 pound loss maintained
You don't drown by falling in the water. You drown by staying there.
No, it will not hurt your pouch.
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.