I don't know the direct answer to your question, however, I have irritable bowel syndrome and am a recovering anorexic. I see a GI dr for my IBS and he knows that I have an ED. It is kind of a which came first question for me. I have had bowel problems since I was a teenager and had my ED since I was 15, I am now 33. I know I do not have colitis or chrones for sure because I have had tests done to see what is causing my bowel issues.