Beverages such as soda and fruit drinks are a major source of added sugar in the U.S. diet. Added sugars contribute calories but no essential nutrients to your diet. Dietary guidelines recommend limiting added sugars to less than 10 percent of total calories. That's 200 calories for a 2,000-calorie-a-day diet. Consider that a 12-ounce can of soda has upwards of 100 calories from added sugars.