Wheat mystery: which part really upsets IBS sufferers?

This study looked at whether purified gluten or whole wheat (which contains gluten plus other proteins) causes stomach and gut symptoms in people with irritable bowel syndrome (IBS). Twenty-nine adults with IBS who had previously felt better on a gluten-free diet took part. They ate special bars containing either purified gluten, whole wheat, or a gluten-free sham bar for one week each, while staying on a gluten-free diet. The goal was to see which bar made their symptoms worse, helping to pinpoint what in wheat might be the real trigger.