Inflammatory bowel disease (IBD) includes both Crohn’s disease and ulcerative colitis.
- Crohn’s disease can affect the entire digestive tract, from the mouth to the anus.
- Ulcerative colitis affects the large intestine and the rectum.
You absorb most of the nutrients from your food in the small intestine. Some nutrients are absorbed in the large intestine. If you have Crohn’s disease or ulcerative colitis, you may not absorb iron, folic acid, and calcium well.