Do your kids get hyper after eating candy? It might not be the sugar—but could be the color. Studies have found a link between food dyes and hyperactivity in children. Some even see a link between food dyes—which trigger the release of histamines, part of the body’s immune system—and allergies, as well as ADHD, which affects 5.2 million American children. Yet in 2012, an FDA advisory committee determined that the science was too weak to support a ban on artificial food dyes or a warning label on foods that contain them. Apparently, that’s not the case in Europe, where regulations require such a warning label, forcing European companies to substitute natural…