Potassium is an essential mineral that supports muscle function, nerve signals, and healthy blood pressure. Bananas are a great source—one medium banana provides about 422 mg of potassium along with fiber and vitamins. Adults need 2,600–3,400 mg of potassium daily, but most people don’t get enough.
Eating four bananas a day gives around 1,688 mg of potassium, which is safe for most healthy people but may be too much for those with kidney problems or certain medications. Too much potassium can cause hyperkalemia, leading to weakness, fatigue, or dangerous heart issues.
A balanced diet with a variety of potassium-rich foods—like sweet potatoes, spinach, avocados, beans, and yogurt—is best. If you have concerns about potassium intake, it’s wise to talk to a healthcare professional.
