Fact: This is both true and false. The traditional foods thought to cause acne, such as chocolate and greasy foods, have no effect on acne, and there is no research indicating otherwise. However, there is the potential that individual dietary allergic reactions can trigger acne, such as eating foods that contain iodine, like shellfish, although there is an ongoing controversy about that. A bit more conclusive is new research showing that milk, especially skim milk, can increase the risk of acne. The same may be true for a diet high in carbohydrates; a high glycemic load can increase breakouts, while a low glycemic load can reduce their occurrence. (Glycemic load is a ranking system for the amount of carbohydrates in a food portion; too many carbs in your diet could trigger breakouts.) Experimenting for a few months to see which of these food groups either hurt or help your skin is worth the effort
(Sources: Molecular Nutrition and Food Research, June 2008, pages 718-726; Dermatologic Therapy, March-April 2008, pages 86-95; Journal of the American Academy of Dermatology, May 2008, pages 787-793; and Dermatology Online Journal, May 30, 2006).