A host of new gluten-free products have hit store shelves in recent years, as more people eschew foods containing the protein. Alexa Clark/Flickr hide caption

A box of gluten-free food from Pierce's Pantry, a gluten-free food bank in Massachusetts. Courtesy of Pierce's Pantry hide caption

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

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

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