question: What is known about food intolerance and gluten ?
answer: Celiac disease, with a prevalence around 1% of the general population, is the most common genetically-induced food intolerance in the world. Triggered by the ingestion of gluten in genetically predisposed individuals.
  Emerging research into a syndrome known as nonceliac gluten sensitivity suggests a heterogeneous condition with some features of celiac disease but often categorized as FGIDs, including IBS.