A gluten-free diet (GFD) is a diet that excludes gluten, a protein composite found in wheat, barley, rye,[1][2] and all their species and hybrids (such as spelt,[1] kamut, and triticale[1][2]). The inclusion of oats in gluten-free diet remains controversial. Avenin present in oats may be also toxic for coeliac people.[2] Its toxicity depends on the cultivar consumed.[3] Furthermore, oats are frequently cross contaminated with gluten-containing cereals.[2]