About 40 years ago wheat breeders introduced new varieties of wheat that helped farmers increase their grain yields. But scientists say those varieties aren't linked to the rise in celiac disease. Karen Bleier/AFP/Getty Images hide caption

itoggle caption Karen Bleier/AFP/Getty Images

French Laundry pastry chef Lena Kwak with the gluten-free flour she developed.

Sara Davis/Thomas Keller Restaurant Group hide caption

itoggle caption Sara Davis/Thomas Keller Restaurant Group