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More and more groceries and health food stores stock gluten-free products. That’s good news for people with celiac disease, who for health reasons should not eat wheat with gluten.

Yet paradoxically, most of the people who reach for gluten-free products don’t have celiac disease and or even a sensitivity to wheat, Peter H.R. Green, MD, director of the Celiac Disease Center at Columbia University, told WebMD. "The market for gluten-free products is exploding. Why exactly we don’t know. Many people may just perceive that a gluten-free diet is healthier."

In fact, it isn’t. For people with celiac disease, a gluten-free diet is essential. But for others, "unless people are very careful, a gluten-free diet can lack vitamins, minerals, and fiber," says Green.

Celiac Disease Serious, Often Undetected

Experts estimate that about 1% of Americans have celiac disease. The condition, caused by an abnormal immune response to gluten, can damage the lining of the small intestine. That, in turn, can prevent important nutrients from being absorbed.

Symptoms of celiac disease include diarrhea, anemia, bone pain, and a severe skin rash called dermatitis herpetiformis. But celiac disease often has few or no symptoms. In part for that reason, only about 5% to 10% of cases are diagnosed in the U.S., Green says.

How can you know if you have celiac disease? The only way is to be tested. The first test is typically a blood test that detects antibodies related to an abnormal immune response. If the blood test is positive, a biopsy is performed to confirm inflammation in the lining of the small intestines.

But What If You Don't Have Celiac Disease?

Some people may be sensitive to gluten but don’t have outright celiac disease. These people may feel better on a diet with less gluten.

So what's wrong with the rest of us trying a gluten-free diet a try to see how we feel?

For starters, going gluten-free means saying no to many common and nutritious foods. Gluten is a protein found in wheat, barley, and rye. Gluten also shows up in many whole grain foods related to wheat, including bulgur, farro, kamut, spelt, and triticale (a hybrid of wheat and rye). Some celiac disease experts warn patients to steer clear of oats, as well.

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