Nitrites and nitrates (preservatives found in bacon, hot dogs, and lunch meats), sorbic acid (found in cheese, frosting, and dried fruits), dyes (especially yellow dye #5), MSG (found most commonly in some Chinese restaurant food, chicken broth or flavoring, and bouillon), and aspartame (an artificial sweetener) can exacerbate symptoms for some children with ADHD and autism. A 2007 Lancet study found that artificial colors and preservatives increase hyperactivity in young children.