You already knew all the artery-clogging fats and addicting sugars in candy weren’t doing you or your family any good, but you probably don’t know that certain candies can make it more difficult for children to concentrate. A few years ago, researchers discovered that the artificial colors, Yellow No. 5 and Yellow No. 6 (found in M&Ms), promote Attention Deficit Disorder (ADD) in children, according to a study in the journal The Lancet. In fact, Norway and Sweden have already banned the use of these artificial colors.