There is no reliable test to diagnose gluten sensitivity, according to Murray, so whatever your nutritionist ordered is not medically approved.

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People who feel they are gluten-sensitive but do not test positive for celiac disease do not have celiac disease.

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"If anyone claims they have a test that is specifically for gluten sensitivity, there is no such thing, though I'm not ruling it out in the future, " says Dr. Fasano.

WSJ: New Guide to Who Really Shouldn't Eat Gluten

The experts also propose a third category for "gluten sensitivity, " in which patients report the same symptoms as celiac disease but test negative for telltale antibodies.

WSJ: New Guide to Who Really Shouldn't Eat Gluten

If you test negative for this potentially serious condition, then you can begin a trial to see just how gluten-sensitive you are, if at all.

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