Ensure
I don't drink it. I would use a good protein drink instead, but if you prefer Ensure, just make sure you use of the ones with less sugar - I think the low carb one or the high protein one is low in sugar. The regular has something like 23 grams of sugar, which would make me dump.
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.