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Bananas are high in potassium (~420 mg each). For healthy kidneys — fine, even good. For CKD stages G3b-G5 or dialysis — they're on the avoid list because potassium handling is impaired.
A medium banana has ~420 mg potassium — about 10% of the daily adult need, and a significant chunk of a dialysis patient's daily potassium budget (often 2,000 mg).
In early CKD (G1-G3a) with normal potassium, bananas are fine in moderation.
In advanced CKD, dialysis, or with potassium-raising medications (ACEi/ARB, spironolactone), bananas should be limited or avoided — check your potassium trend with your care team.
The potassium 'danger' is real but gradual: it's repeated high-potassium intake, not one banana, that drives chronic hyperkalemia.
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This content is a general reference, not medical advice, a diagnosis, or a treatment plan. Do not change your diet, fluids, medicines, or dialysis plan without your nephrologist or renal dietitian. Individual recommendations depend on your labs, medications, conditions, and care plan.