This document discusses celiac disease and gluten sensitivity. It begins by describing celiac disease as an autoimmune reaction to gluten that damages the small intestine. In addition to gastrointestinal symptoms, celiac can cause many other symptoms affecting overall health. Leaving celiac undiagnosed increases the risk of cancer, infertility and other diseases. The document also discusses lactose intolerance, milk allergies, and soy sensitivity that often accompany celiac disease. Approximately 1 in 100 people have celiac, though most cases remain undiagnosed.