Researchers say they believe a portion of the population with symptoms from eating gluten do not have celiac disease, but instead may have nonceliac gluten sensitivity. A 1981 study found 6 out of 8 people with abdominal pain and chronic diarrhea did not have celiac disease, but the authors note testing of nonceliac gluten sensitivity is difficult, and claims of celiac intolerance "seem to increase daily, with no adequate scientific support to back them up."

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