If someone has an allergy to wheat/gluten/grains, what occurs when they eat any of them together?

Small Bowel Inflamed. If diagnosed with celiac diease, please read labels carefully and avoid all foods with wheat, barley, rye (includes breads). Explore the gluten-free aisles of your supermarket. Enjoy products made with rice, soy, oats and liberalize fresh fruits and vegetables, as well as lean meats. Consider blood testing for tissue transglutaminase antibody to assess whether your diet is truly free of gluten.