Go with the blueberries. They are full of antioxidants and very low in natural sugars, which will help keep your blood sugar stable. Bananas are full of sugar and can cause the body to overproduce insulin, which can lead to a host of problems. (Obviously 1 banana isn't going to kill you, but blueberries are definitely the healthiest option.) If you are concerned about potassium - you can actually get more potassium from an avocado than a banana - and all without the blood glucose issues.
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