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The renal diet in one guide — why potassium, phosphorus, and sodium matter, what the targets are at each stage, and how to build a kidney-friendly plate.
Evidence reviewed & updated: 2026-08 — reflects the latest published trials and guidelines.
The renal diet is built around three minerals — potassium, phosphorus, and sodium — plus protein and fluid that change by stage. Early CKD mostly needs sodium control; advanced CKD and dialysis tighten potassium, phosphorus, and fluid. This is the framework for eating with CKD.
Sodium drives blood pressure — the #2 cause of kidney failure in India — so it's the first lever at every stage. Potassium accumulates as GFR falls and is the arrhythmia risk; phosphorus drives vascular calcification and bone disease. The renal diet manages all three against stage-specific budgets.
The practical version: season with lemon, garlic, and spices instead of salt; check potassium values on high-K foods; and take phosphate binders with meals when prescribed.
Stage 1-2: sodium <2,000 mg/day and sensible portions — most foods still fit. Stage 3: potassium (~2,400 mg) and phosphorus begin to matter; portion control and leaching enter. Stage 4-5: potassium under ~1,800 mg (1,500 pre-dialysis), phosphorus under ~800 mg with binders, and protein drops to 0.6-0.8 g/kg pre-dialysis.
On dialysis: protein rises to 1.2 g/kg, potassium and phosphorus stay tight, and fluid becomes a daily budget. The food database and stage lists on this site apply these rules food by food.
Anchor the plate on low-potassium staples: rice, sabudana, poha, and the lighter dals; fill with low-K vegetables (bottle gourd, cucumber, cabbage); and choose low-phosphorus proteins (egg whites, tofu, fresh fish and chicken). Fruits: apple, papaya, grapes, pear.
The swaps matter more than any single food: moong dal for rajma, apple for banana, rice for potato. The food database's alternatives and swap guidance make this concrete for each food.
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