Coke Zero does not contain any calories or sugar and is not a significant source of nutrients. It’s sweetened with artificial sweeteners, which have controversial health effects. 
The evidence on the use of Coke Zero and other artificially sweetened drinks for weight management is conflicting. More research is needed to understand the benefits and risks of diet beverages. 
The acidic pH level of Coke Zero is associated with an increased risk of enamel and tooth erosion, though it may affect your teeth less than other acidic beverages.
Though Coke Zero is sugar-free, its artificial sweeteners are controversial. Still, research on the effects of artificial sweeteners on diabetes risk is mixed, and more studies are needed to fully understand a possible connection. 
Coke Zero and other diet sodas are linked to alterations in the gut microbiome and an increased risk of osteoporosis and heart and kidney disease. However, more research is needed.
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