(NewsNation) — Gluten-free diets have surged in popularity in recent years, even among people who don't have an intolerance to gluten.

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 gluten-free diets are essential for people with celiac disease and can be beneficial for those with gluten sensitivity, research suggests they may not significantly improve overall health for people who can tolerate gluten.

What's celiac disease?

Celiac disease is "an autoimmune response to gluten that causes the body to attack the small intestine, causing belly pain, nausea, bloating or diarrhea," according to

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