Yes, Coke Zero is technically keto-friendly. It contains zero calories and zero net carbs, meaning it will not physically kick you out of ketosis . However, there is a massive difference between "losing weight" and "optimal health." If you are doing "Dirty Keto" it’s a staple; if you are doing "Clean Keto," you might want to reconsider. The Sweetener Profile (Aspartame & Ace-K) Coke Zero uses a blend of Aspartame and Acesulfame Potassium (Ace-K). The Science: Unlike sugar, these do not raise blood glucose levels in the majority of the population. The Catch: Some studies suggest Ace-K can affect gut microbiota, which plays a secondary role in metabolic health. Does Coke Zero Cause an Insulin Spike? The biggest fear in the keto community is the Cephalic Phase Insulin Response —the idea that tasting sweetness triggers insulin even without sugar. Data Check: Clinical trials show that for most people, the sweeteners in Coke Zero do not raise i...