Researching Irritable Bowel Disease (IBS), Ulcerative Colitis (UC) and Crohn’s Disease (CD) will uncover a lot of resources across the internet. The biggest difficulty you may find is differentiating between the good from the bad information. In my research I have spent a lot of time reading and comparing the information I am getting from different sources to try to find consensus built on independent sources. this has not always been easy and I have discovered claims from both the Diet and Medicine camps that rely on very old and less than reliable information.
Below are some links to resources I have found to be useful in understanding Ulcerative Colitis (UC) and Irritable Bowel Syndrome (IBS). Use them with care and due caution.
The Crohns & Colitis Foundation of America
The American Medical Association
The Journal of the American Medical Association
The National Institutes of Health