This may actually be what causes my mouth ulcers. I know that mouth ulcers are an extracolonic condition for many people with UC, but I haven't been able to explain why. *shrug* Just a thought, though.
I can't eat apples, pears, honeydew, cherries, tomatoes, or avocado unless it's super ripe. I also have to make sure any banana I eat has lots of brown spots on the peel. But like Lydia, anything cooked or from a can is fine.