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Dark chocolate has antioxidants, but it's also high in potassium, phosphorus, and oxalate — a triple hit for kidney patients. A small square occasionally may fit early-CKD budgets; in advanced CKD, dialysis, and stone formers, it's on the limit list.
Dark chocolate (70%+ cocoa) delivers flavanols with heart benefits — but per 100g it runs ~700-1,000 mg potassium and ~300-500 mg phosphorus, plus significant oxalate. Two squares can still add meaningful potassium.
For calcium-oxalate stone formers, chocolate is a documented oxalate source worth limiting. For advanced CKD and dialysis, the potassium load rules it out except as an occasional treat.
Practical rule: early CKD — a small square occasionally; stages 4-5, dialysis, or stone formers — limit or avoid; if you want the cocoa benefit, discuss with your dietitian.
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