In this Thursday, July 14, 2012 photo, 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 do and spend more than $7 billion on gluten-free products. Yet, experts estimate that more than half of those consumers don't have any clear-cut reaction to gluten. (AP Photo/John Bazemore)
{}