1. Acesulfame K

Known commercially as Sunette or Sweet One, acesulfame is a sugar substitute sold in packet or tablet form, in chewing gum, dry mixes for beverages, instant coffee and tea, gelatin desserts, puddings and non-dairy creamers. Tests show that the additive causes cancer in animals, which means it may increase cancer in humans. Avoid acesulfame K and products containing it. Your sweet tooth isn't worth it.