Patients with celiac disease are unable to tolerate the protein gluten, found in wheat, rye, barley and oats and hence patients with celiac disease should avoid these food items.

one needs to avaoid the following food items:
Breads and rolls made from wheat, rye, oats, barley, buckwheat, durum, or graham; commercial mixes for biscuits, cornbread, muffins, pancakes, waffles; wheat germ; bran; bulgar; millet, triticale; crackers; pretzels; millet; melba toast; matzo; bread crumbs; pastry; pizza dough; regular noodles, spaghetti, macaroni, and other pasta; dumplings; cereals containing malt or malt flavoring derived from barley; cereals containing wheat, rye, oats, barley, bran, buckwheat or bulgar.
Any thickened or prepared fruits; any creamed or breaded vegetables; commercially prepared vegetables with cream sauce or cheese sauce.
Commercial chocolate milk and drinks; malted milk; non dairy creamers; cereal beverages such as Postum and Ovaltine; processed cheese foods and spreads.
Commercial salad dressings, and mayonnaise; gravy and cream sauces thickened with flour.
Prepared cake and cookie mixes; donuts and pastries; ice cream (with gluten stabilizers); ice cream cones; pies; bread puddings; pudding thickened with flour;
Instant coffee; beverage mixes; nutritional supplements; alcoholic beverages made from cereal grains such as gin, whiskey, vodka; sherry, fortified wine, beer, ale, and malt liquor.