Comment by aenis

Anecdata. I did quite a few experiments on myself, as I practice alternate day fasting and keto diet for extended periods of time, and routinely maintain high blood ketone body levels (3-9mmol/l). Drinking beverages with artificial sweeteners (coke zero) did not change my ketone levels - or interrupted them going up. I think it may be overall beneficial since those beverages make low carb diets way easier.