Does Diet Coke not have any calories? The Truth Behind the Label
                                
                                
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                                    4 min read                                
                            
                                According to the U.S. Food and Drug Administration (FDA), a product with fewer than 5 calories per serving can be legally labeled as having 'zero calories'. This regulation is key to understanding whether Diet Coke not have any calories, and the answer is more complex than a simple yes or no. The artificial sweeteners in the drink, while providing flavor, contain a negligible amount of calories that are rounded down for nutritional labeling purposes.