Side effects of drinking diet soda include kidney problems, metabolic syndrome, obesity, quicker intoxication (when mixed with alcohol), cell damage and damage to tooth enamel. The cans soft drinks come in are coated with bisphenol A (BPA) which has been linked to heart disease and reproductive problems, as stated by Prevention.
Diet soda has a pH of 3.2, which is very acidic, and can dissolve the enamel off teeth. Diet soft drinks contain mild inhibitors, called sodium benzoate or potassium benzoate, which have the ability to damage DNA in the mitochondria in cells. These chemicals also have been linked to hives, asthma and allergies. Artificial sweeteners have been shown to increase obesity by 500 percent, according to Prevention. Studies also have shown that diet cola is associated with a two-fold increase in risk for kidney decline for those who consume two cans a day or more.