1) Celiac disease is an autoimmune disorder where the ingestion of gluten leads to damage in the small intestine. It affects approximately 1 in 100-150 people worldwide. 2) Left untreated, celiac disease can cause nutrient deficiencies, bone loss, fatigue and other issues. The only treatment is a strict lifelong gluten-free diet. 3) The document discusses two case studies of college athletes diagnosed with celiac disease and how identifying and treating the condition helped improve their athletic performance and health.