These 11 kale smoothie recipes for weight loss are easy and yummy, and packed full of nutrition! They are meant to accompany a meal (they are just 82 calories) but you could easily make one a meal replacement smoothie by doubling the serving and adding in 1-2 scoops of Vanilla Protein Powder or Unflavored Collagen Powder.Make sure to remove and discard the thick stems from the kale leaves and discard it before blending. This will help the consistency in your kale smoothie. Special Note: The nutrition is based off the first smoothie, the Kale Banana Smoothie.