Aspartame -- the artificial sweetener found in drinks like Diet Coke -- is probably not good for you. If you believe otherwise, I admire your commitment to self-delusion. A new study published by a team of investigators at Massachusetts General Hospital in Applied Physiology, Nutrition and Metabolism found a possible reason aspartame doesn't help you lose weight -- oh sorry, haven't you heard? Like most things in society, diet soft drink is probably a giant scam.