Gluten-Free Diets: An Ayurvedic Review

Gluten is particularly difficult to digest and requires a strong stomach acid to process it. If not enough of this acid is produced or excreted due to a weak digestive fire, the gluten passes through to the small intestine, undigested. If eaten in excess, it can irritate the intestinal villi on the gut wall and affect our digestion and absorption .

http://www.muditainstitute.com/articles/ayurvedicnutrition/glutenfree.html