Pineapple is a natural metabolism booster, has an enzyme that helps with digestion, and helps cut through the bitterness of kale. If you haven’t tried greens in a smoothie before, this is the one to try first. You could swap the kale for spinach if you want a milder flavor to start. We’re also using avocado for creaminess instead of a banana, so this is a lowercarb option than other smoothies. Add a teaspoon of matcha green tea powder for an extra boost, if you’d like.