Many studies have shown that food dyes can impair children’s behavior, but until now the amounts of dyes in packaged foods has been a secret. New research by Purdue University scientists, published in the journal Clinical Pediatrics, reports on the dye content of scores of breakfast cereals, candies, baked goods, and other foods. According to the nonprofit Center for Science in the Public Interest, the findings are disturbing since the amounts of dyes found in even single servings of numerous foods—or combinations of several dyed foods—are higher than the levels demonstrated in some clinical trials to impair some children’s behavior.