Is your problem gluten? Or faddish eating?

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A worker packages gluten-free bread at Pure Knead bakery sandwich bread in Decatur, Ga. A decade ago, virtually no one in the United States seemed to have a problem eating gluten in bread and other foods. Now, millions think they do and spend more than $6 billion on gluten-free products. | THE ASSOCIATED PRESS

Gluten-free eating has exploded in America, but scientists aren’t sure how many people are doing it for medical reasons.

A recent study suggests that nearly 2 million U.S. adults have celiac disease, a digestive disorder caused by foods that contain gluten, a protein that is in wheat.

In the past few years, scientists have also identified another group of people as “gluten sensitive” — a different condition with similar symptoms.

But there is no test for gluten sensitivity, and how many people actually have it is a matter of debate.

Meanwhile, gluten-free has become a fad. Americans will spend an estimated $7 billion this year on foods labeled gluten-free, according to the market research firm Mintel.