Every banana smoothie has just one ingredient in common – the fruit – so there’s plenty of room for variation. That means it’s hard to predict how many calories are in your drink. However, if you know the other ingredients and how big of a serving you’re having, that’s enough information to make an educated estimate.
Some banana smoothies sold at cafes or grocery stores are healthy and low in calories – and some are just milkshakes in disguise. At one national drink chain, a high-protein banana smoothie has about 315 calories in a 20-ounce serving, which is equivalent to 2 1/2 cups. But, you could make a smoothie of the same size at home with one medium banana, 6 ounces of nonfat, plain Greek yogurt, cold water and crushed ice for just 205 calories.
Whole, natural ingredients are healthier and often lower in calories than some of the processed additives you might find in a commercial smoothie. A very small banana has just 70 calories, and a very big banana has about 135. By adding sugar, however, the calorie count of a drink can raise quickly. One tablespoon of granulated sugar has about 45 calories, and some prepared smoothies have almost 8 tablespoons of added sugar.
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