Gluten-free diets have surged in popularity in recent years, even among people who don't have an intolerance to protein.

Gluten is a protein found in grains, including wheat, barley, rye and triticale — a cross between wheat and rye. People who have celiac disease cannot tolerate gluten at all and must follow a strict gluten-free diet throughout their lives.

While this kind of diet can be beneficial for those with gluten sensitivity, research suggests it may not significantly improve overall health for people who can tolerate the........

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