It is estimated that 2.5 million people in the U.S. are still undiagnosed with celiac disease. When someone with celiac disease eats gluten - a protein found in foods such as wheat, rye and barley - their body mounts an immune response that attacks the small intestine. These attacks lead to damage to the villi, the small fingerlike projections that line the small intestine. In turn, nutrients will not be absorbed properly, which leads to life threatening symptoms. The only current treatment for celiac disease is a strict, gluten-free diet.