What’s the most common reason why people buy gluten-free foods? “No reason at all,” says one survey. The respondents’ other reasons: they see gluten-free foods as a “healthier option,” good for “digestive health” or “weight loss,” or they “enjoy the taste.” Those reasons were all more common than “gluten sensitivity,” which was cited by only 8 percent. But in a recent study, even GI symptoms like diarrhea or bloating weren’t a reliable sign of celiac disease, the autoimmune disorder that makes people unable to tolerate gluten, the protein in wheat, barley, rye, and some other grains. “Our study asked about abdominal pain, diarrhea, constipation, vomiting, weight loss, irritable bowel syndrome, dyspepsia, GERD, difficulty swallowing, bloating, and distention,” says Joseph Murray, a gastroenterologist and celiac expert at the Mayo Clinic. “None were significantly associated with having celiac disease.”