According to the Centers for Disease Control and Prevention, the number of children with food allergies jumped 18% between 1997-2007, and researchers at Northwestern University's Feinberg School of Medicine in Chicago found 8% of U.S. children under the age of 18 have at least one food allergy.
Researchers at the Medical College of Wisconsin have found a possible link between norovirus, a virus that causes "stomach flu" in humans, and food allergies.