Gluten is not a proven IBS trigger. However, a carbohydrate found in wheat, rye and barely (the same grains that contain gluten) called a fructan - a high FODMAP - has proven to be an IBS trigger. Here is an article that explains this clearly
And for an overview article on the clinically proven FODMAP elimination/re-introduction diet shown to reduce symptoms 70-80% in IBS suffers here is an article written by Kate Scarlata - a dietitian with IBS
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It isn't gluten - it is a carb found in wheat, rye and barley called a FODMAP
