Although bananas are a good source of potassium, many other nutritious foods, including sweet potatoes, legumes, and beets, offer more potassium per serving. Swiss chard, yams, and white beans even have twice as much potassium per cup as a medium banana. The key to getting enough potassium is to eat a range of plant foods each day. Certain fish, such as salmon, tuna, and cod, are good animal-based sources of this mineral too.

Source: Healthline