The true statements about inflammatory bowel disease (IBD) are:
- It is a general name for a group of diseases that cause inflammation and swelling of the intestines.
- Ulcerative colitis and Crohn's disease are the two most common forms.
- The cause is unknown.
The statement "People who are omnivores are least likely to experience IBD." is not true; dietary habits alone do not determine the likelihood of developing IBD.