In celiac disease, the immune system attacks the intestines but causes harm only in the presence of gluten, a protein bundle found in wheat, barley, rye, and related grains. People with celiac disease need to avoid gluten both in foods, medications, and supplements. Getting adequate nutrition, maintaining bone health, and keeping blood glucose on target can take a bit more practice and patience for people with celiac disease; a registered dietician with expertise in type 1 diabetes and celiac disease is essential for learning how to live with dual diseases.