For healthy adults, 1–2 bananas per day is safe. A banana contains about 400–450 mg of potassium; the daily requirement is 3500–4700 mg. Excessive intake (e.g., >5–6 bananas daily) can lead to hyperkalemia, especially in those with impaired kidney function or taking potassium-sparing medications (ACE inhibitors, spironolactone). Symptoms like muscle weakness, arrhythmias, or nausea warrant medical evaluation. Diabetics should also consider sugar content, but moderate amounts are usually fine. See a doctor if you have kidney disease, take potassium-affecting drugs, or experience symptoms after high banana consumption. The evidence is based on clinical practice and physiology, not on specific banana studies. Caution is advised for at-risk individuals.
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