Gluten intolerance is a very common issue ranging in severity for different individuals. Non-celiac gluten intolerance is the milder version of this issue whereas celiac disease is the most enhanced and severe form of this problem. In both, individuals have problems with properly absorbing the wheat protein called gluten.
Gluten is a protein found in grains like wheat, rye, barley and spelt. It causes digestive problems in people with celiac disease who are unable to process this protein properly. For this group of people, gluten free eating is a lifestyle habit out of necessity.