You could also have Celiac Disease, so it would be best to get checked for that as well, if you haven't already.

There was a study done in Italy a few years ago:

"The researchers conclude that there is a high prevalence of celiac disease in those with Crohns disease, and that all patients who are diagnosed with Crohns disease should begin a gluten-free diet at the time of diagnosis."

Celiac Disease Prevalence High in Patients with Crohn's Disease