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First of all, bananas are a storehouse of useful substances. These fruits have a high content of potassium, fiber, vitamin C and B6. A high sugar concentration (14 g per 1 banana) is harmoniously softened by fiber, which evens out the glycemic index of the fruit. Bananas have been proven to reduce the risk of cancer, heart disease, and diabetes. But at the same time, you still need to know a few nuances that are associated with the use of these sweet fruits.