Some food grain antigens found in wheat, rye, and barley are thought to create a toxic reaction in those who suffer from celiac disease, gluten intolerance, wheat allergy, and other health problems. Studies have been inconclusive but the gluten intolerance seems based in genetic makeup, especially in people of Northern European descent.

For someone with gluten intolerance, eating foods made with those grains containing gluten, especially wheat, may cause severe gastrointestinal discomfort. Celiac disease commonly requires a gluten-free diet. Read more