An FDA rule effective Aug. 5 states that foods may be labeled "gluten free" only if there's less than 20 parts per million of the protein. James Benet/iStockphoto hide caption

itoggle caption James Benet/iStockphoto

More and more gluten-free beers are entering the marketplace. We asked a librarian with celiac disease for her list of favorites. Bill Chappell/NPR hide caption

itoggle caption Bill Chappell/NPR

Students at the University of Washington used a protein-folding program initially funded by the Defense Advanced Research Projects Agency to come up with a treatment for celiac disease. DARPA hide caption

itoggle caption DARPA