I am relatively new to Healthy Eating. I just bought a NutriBullet and want to start making healthy smoothies. What ingredients and how much contributes to a tasty, palatable drink? I know the smoothies will be green as a result of the veggies like kale. Some of my healthy eating relatives tell me two thirds of the smoothie should consist of kale and spinach. I want it taste good so I can get it down! What else?