Gluten is the protein that occurs naturally in wheat, rye, barley, and crossbreeds of these grains. Foods that typically contain gluten include breads, cakes, cereals, pastas, and many other foods.
Gluten is the substance that gives breads and other grain products their shape, strength, and texture. But for the estimated 3 million Americans suffering from celiac disease, an auto-immune digestive disorder, consuming gluten can have serious health consequences. source: FDA