This easy frozen fruit smoothie recipe is easy to make and low in calories.I have a best selling cookbook centered around smoothies, so I know a thing or two about how to make a smoothie recipe taste amazing, without being loaded with calories.TIPS TO MAKING A LOW CALORIE FROZEN FRUIT SMOOTHIE:1. Use sliced, frozen banana in place of sweetener. It will give the smoothie a boost of sweetness and add creaminess.2. Berries alone are not that sweet, add in pineapple to sweeten and give a tropical flare.3. If you want to add greens, try baby spinach. It has practically no flavor.