A gluten-free diet is a diet that excludes gluten, a protein composite found in wheat and related grains, including barley and rye. Gluten causes health problems in sufferers of celiac disease and some cases of wheat allergy. For those diagnosed with celiac disease, a strict gluten-free diet constitutes the only effective treatment to date. There is ongoing research and debate on non-celiac gluten sensitivity.
In recent years the importance of a gluten free diet has increased, even if not every single person looking for a gluten-free life does so because of allergies or disease.