Coca-Cola, Pepsi, Mountain Dew ... that doesn't mean it's healthy. A 12-oz can of diet soda contains around 30 and 50 milligrams of caffeine. While lighter in sugar and calories, diet soda ...
Here is how much caffeine is in popular soft drinks: 12 oz. Regular or Diet Pepsi: 34-38 mg caffeine 12 oz. Diet Coke: 46 mg ...