Need a reason to break your soda addiction? We've got 9, and they're not pretty.
By Emily Main
4 of 10
In 2011, the nonprofit Center for Science in the Public Interest petitioned the Food and Drug Administration to ban the artificial caramel coloring used to make Coke, Pepsi, and other colas brown. The reason: Two contaminants in the coloring, 2-methylimidazole and 4-methylimidazole, have been found to cause cancer in animals, a threat the group says is unnecessary, considering that the coloring is purely cosmetic. According to California's strict Proposition 65 list of chemicals known to cause cancer, just 16 micrograms per person per day of 4-methylimidazole is enough to pose a cancer threat, and most popular brown colas, both diet and regular, contain 200 micrograms per 20-ounce bottle.