Why Food Allergies Are on the Rise

Food allergies are on the rise, having doubled in children between 2000 and 2018. Andrew Van Dam, who writes the weekly Department of Data column for The Washington Post and Christopher Michael Warren, assistant professor of preventive medicine and director of population health at Northwestern University's Center for Food Allergy and Asthma Research (CFAAR), crunch the data to show just how prevalent they are and what's behind the uptick in kids and adults alike.