Aspartame- that can't be good
An article on High Fructose Corn Syrup had this nugget:
Diet Coke contains aspartame. Yet in 1985, as a member of the National Soft Drink Association, Coca-Cola opposed the FDA approval of aspartame for beverages. The company’s own objections—running to several pages in the Congressional Record—included the assertion that aspartame is uniquely and inherently unstable and breaks down in the can. It decomposes into formaldehyde, methyl alcohol, formic acid, diketopiperazine, and other toxins. In a study on seven monkeys, five had grand mal seizures and one died, a casualty rate of 86%.