Sweetener Note - The original Atkins recipe calls for "sugar substitute". If going this route, be sure to pick a natural option that your body is comfortable with. And if using pure stevia, start with just a pinch of the powder or a few drops of the liquid. It's potent stuff! If you are okay with more traditional sweeteners, honey, agave nectar, coconut sugar, or coconut nectar will be delicious in this smoothie.