When my Crohn's is in remission, I can eat corn no problem. It doesn't cause a flare up it just passes right on through - looks the same coming out as it did going in! In fact, when I am in remission, I can eat just about anything including nuts, seeds and popcorn. BUT when I have active Crohn's (like now, for instance) I can hardly eat anything! Any form of fibre or ruffage is strictly off limits. This means no corn (in any form), lettuce, cabbage, cauliflower, broccoli, apples, berries, and the list goes on, and on, and on......*sigh*