Is Sugar Free Coke a Diuretic? The Truth About Caffeine and Hydration
                                
                                
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                                    4 min read                                
                            
                                Despite containing caffeine, a mild diuretic, the fluid content of diet soda is typically sufficient to counteract any significant fluid loss, meaning a can of sugar-free Coke is not dehydrating for most people. The common belief that all caffeinated drinks cause net dehydration is a myth based on outdated science.