Celiac disease

The intestinal lining has small hair-like projections called villi, which help absorb nutrients. When people with celiac disease eat foods with gluten, it triggers an immune response. Over time, the inflammation caused by the immune response damages the villi. Because of the damage, the villi are unable to properly absorb iron, vitamins, and other nutrients. This may cause a number of symptoms, including diarrhea, fatigue, and weight loss, as well as a number of other health problems.