The ketogenic diet forces your body into a metabolic state known as ketosis. Don’t let that scare you. Ketosis is a natural metabolic state. Ketones are produced when you eat minimal amounts of carbohydrates and moderate amounts of protein. When your body doesn’t have carbohydrates to burn for energy, it burns fat. Simply put, on a keto diet, you are changing your body into a fat burning machine!
Some do, and some don't. Similarly to sugar alcohols, different sweeteners have different glycemic indexes. Powdered versions of artificial sweeteners like splenda and even natural ones like stevia have added carbs that come from maltodextrin and other fillers, so stay away from those. Here are the best sweeteners to use while on vegetarian keto (all of them have a glycemic index of zero):