Have you read the book "Breaking the Vicious Cycle" by Elaine Gottschall, or checked out the website called pecanbread.com?
Also keep in mind that some Crohnie's are able to get into remission with enteral nutrition (a strict liquid only diet for a period of time, in case you're unfamiliar) by drinking one of the formulas that are out there, i.e. EO28 Splash, Ensure, Boost, Absorb Plus, etc. You can google all of these if you are unfamiliar with them. I'm sure there must be more that I don't know about. Most people (my child included) are not willing to give up food for the necessary time period, but for those who do it seems to help alot.