Sparkling Low Calorie Soft Drink with Plant Extracts with Sweeteners. A low calorie sparkling soft drink with no sugar and no calories. The great refreshing taste of Diet Coke with no sugar and no calories. Add some sparkle to your day without the sugar or calories, with a crisp, refreshing Diet Coke!. Diet Coke is a sugar free, low calorie soft drink. No Sugar. No Calories. Contains plant extracts and sweeteners. Contains a source of Phenylalanine. Serve over ice with a slice of lime. Keep cold in the fridge. Please recycle.