You called it right - problem. If you do fasting (no food, just water) for 72h and after fasting put on the table your "delicious" Diet Coke and, let's say V8 v

You called it right - problem. If you do fasting (no food, just water) for 72h and after fasting put on the table your "delicious" Diet Coke and, let's say V8 veggie juice and try both your body will tell you what's good. You won't be able to drink sweetened drink.