"aspertame" is an artificial sweetner that when heated above a certain temperature it turns into!!! formaldehyde. lets say you leave an unopned can of diet coke in your car on a warm day and the temperature reaches 80 degrees or above. the heat will cause a chemical change. at the end of the day you grab that can of soda and put it in the fridge to drink later. you can become very sick it is not only bad for you but the cause of several illnesses being misdiagnosed among many as ms (multiple sclorosisx and lupus.!!