Keep lactose low. The damage to the intestine in celiac disease often leads to lactose intolerance, which means you aren't able to digest the type of Sugar found in milk and other dairy products. The symptoms are diarrhea and gas.
Keep your lactose consumption low or nonexistent during this trial. If you want to keep consuming milk and milk products, you can buy lactose-reduced milk (in the dairy case next to all the other milk), lactase drops (add the drops to regular milk), or over-the-counter lactase caplets or chews (in your grocery store or pharmacy, near other digestive aids).
Celiac disease is an autoimmune disease triggered mainly by ingestion of wheat gluten proteins. However, some other dietary proteins, such as those of cow's milk, induce celiac disease–like symptoms in some patients with celiac disease. Different approaches have been done to detect the component responsible for this problem, including the possibility of gluten peptides present in cow's milk.