Dietary Restrictions by CKD Stage
| CKD Stage | eGFR | Dietary Restrictions |
|---|---|---|
| Stage 1–2 | 60–90+ | Healthy diet, salt restriction, avoid NSAIDs |
| Stage 3a | 45–59 | Monitor potassium, reduce processed foods |
| Stage 3b | 30–44 | Limit high-potassium foods, moderate protein |
| Stage 4 | 15–29 | Strict potassium + phosphate limits, protein moderation |
| Stage 5 / pre-dialysis | <15 | Full renal diet, fluid restriction |
High-Potassium Foods to Limit (CKD 3b+)
| High Potassium — Limit | Lower Potassium — Choose Instead |
|---|---|
| Bananas, oranges, kiwi | Apples, berries, grapes, pears |
| Potatoes (especially baked) | Boiled and drained white rice, pasta |
| Tomatoes, tomato puree | Cabbage, green beans, cauliflower |
| Spinach, kale | Lettuce, cucumber, courgette |
| Nuts, seeds | Egg whites, unsalted crackers |
| Chocolate, coffee (large amounts) | Moderate intake |
Leaching PotassiumPeeling and boiling vegetables, then discarding the water, reduces potassium content by up to 50%. Don't use cooking water for soups or sauces if you're on a low-potassium diet.
Phosphate — Why It Matters in CKD
Kidneys normally excrete phosphate. In CKD, phosphate builds up and causes: vascular calcification (hardening of arteries), bone disease (renal osteodystrophy), and cardiovascular risk.
- Limit: processed foods (phosphate additives), cola drinks, dairy products in excess, processed meats
- Choose: fresh unprocessed foods — phosphate from natural foods is absorbed less than from additives
- Take phosphate binders as prescribed (calcium carbonate, sevelamer) with meals
Should I limit protein in CKD?
Evidence for protein restriction is strongest in CKD stages 4–5 (eGFR <30). A moderate restriction (0.8g/kg/day rather than high protein) appears to slow progression. Discuss with your renal dietitian.
Can I drink alcohol with CKD?
Moderate alcohol (1–2 units/day) is not contraindicated in CKD but alcohol is high in potassium and can dehydrate. Excessive alcohol accelerates kidney damage.
Do I need to restrict fluid?
Fluid restriction is only needed if you are retaining fluid (swelling, high blood pressure, or on dialysis). In early CKD, good hydration (1.5–2L/day) is generally recommended.
Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.