For years doctors were taught in medical school that gluten sensitivity and its severest form, celiac disease, were rare, identified mainly in children who were unable to absorb food. In photographs, youngsters with celiac disease looked like starving children because in fact they were starving, for nutrients. Once the diagnosis had been made and they’d been taken off all gluten grains–wheat, barley, rye, oats, kamut, and triticale–they rapidly regained weight and lived normal lives.