It seems that the general consensus from GI doctors is that banana is something that nearly all UC patients can tolerate quite well. SO I think the answer is yes, banana is good for ulcerative colitis. Just like all other foods for anyone, if you find that you are not able to tolerate something, in this case banana, you should talk with your doctor or consider stopping the eating of it.
I eat one banana every morning with the morning smoothie that I make, and it works out perfectly for me. I also add orange juice and strawberries and blueberries to the smooothie and usually throw in some peanut butter too to get some protein. The banana makes it really tasty and I don’t ever plan on cutting it out.
It’s quite tricky when you are in the middle of a colitis flare to figure out what you should be eating, and what might be causing you more pain, so take the approach of testing things out if you can. If you are unsure of something, test it out by eating just a tiny bit at a time. No need to pig out on ten bananas in one day to find out that you have an intolerance for eating them with your ulcerative colitis(UC).