People with celiac disease are unable to tolerate eating a protein named gluten. Gluten is found in wheat, rye, barley, and potentially in oats. The only effective treatment for celiac disease is to avoid eating foods that contain gluten. Symptoms can vary but may include weight loss, diarrhea, constipation, and abdominal pain.
Celiac disease is often diagnosed in childhood, which may be where the myth that it is a childhood disease began. It may go undiagnosed until a person reaches adulthood because some people do not have consistent symptoms, the symptoms may not be severe, or symptoms may attributed to other conditions.
Source:
National Digestive Diseases Information Clearinghouse. "Celiac Disease." National Institute of Diabetes and Digestive and Kidney Diseases Sept 2008. 1 Feb 2011.

