A blackboard is seen at Fonuts bakery, which offers unfried, gluten-free and vegan donuts in Los Angeles, California September 19, 2011. An estimated 18
A blackboard is seen at Fonuts bakery, which offers unfried, gluten-free and vegan donuts in Los Angeles, California September 19, 2011. An estimated 18 million people in the United States are sensitive to gluten, a hard-to-digest protein found in wheat, rye and barley. Another 3 million-plus Americans are thought to have celiac disease, a potentially life-threatening autoimmune disorder that is treated by eliminating dietary gluten. Sales of gluten-free products have been booming despite the weak U.S. economy. (© Lucy Nicholson / Reuters)