If you read through the linked article, you will see that the researcher’s currently favored (though not dogmatically pushed) hypothesis is that it’s not gluten that causes the intolerance, but FODMAP, and that often gluten-containing foods also contain many notable actors in the FODMAP bestiary. Wheat, for example, is not gluten; it contains gluten, but it also contains other stuff. The researcher is wondering if it is in fact some of this other stuff, and not the gluten, that causing the problems.
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