The Evidence on Diet and Kidney Disease, Without the Hype
General healthy-eating advice can be actively wrong in advanced kidney disease, which is why it must come from a renal dietitian.
Key takeaways
- Early CKD: usually standard healthy eating plus lower salt
- Advanced CKD: may require potassium and phosphate restriction
- Most useful single change: Ask for referral to a renal dietitian rather than following general advice.
- Commonest mistake: Potassium-based salt substitutes.
- See a doctor if any of the signs under "When to speak to a doctor" below apply to you.
What it is
Dietary adjustments in kidney disease, which differ sharply by stage. It sits within Kidney Health. Here are the numbers, taken from the guidance cited at the end.
The numbers, in one place
| Measure | Figure |
|---|---|
| Early CKD | usually standard healthy eating plus lower salt |
| Advanced CKD | may require potassium and phosphate restriction |
| Salt | reduction advised at every stage |
| Protein | restriction only on specialist advice, never self-imposed |
| High-potassium foods | bananas, potatoes, tomatoes, dried fruit, nuts |
What helps
The advice below comes straight from the guidance cited at the foot of this page.
- Ask for referral to a renal dietitian rather than following general advice
- Reduce salt, which helps at every stage
- Check any supplement or salt substitute with your renal team
- Read labels for phosphate additives if you have been told to limit phosphate
What to avoid
The common mistakes, including the ones that sound sensible.
- Potassium-based salt substitutes
- Self-imposed protein restriction
- Assuming "healthy" high-potassium foods are safe at every stage
Where to go next
- Diet and Kidney Disease for Beginners: Where to Start
- Diet and Kidney Disease: Common Questions Answered
- Diet and Kidney Disease — the reference entry
- Acute Kidney Injury: What the Evidence Actually Says
- The Evidence on Chronic Kidney Disease, Without the Hype
When to speak to a doctor
Follow your renal team's dietary advice over any general guidance, including advice on this site. Seek urgent help for muscle weakness, palpitations or an irregular heartbeat, which can indicate dangerously high potassium. Never use potassium-containing salt substitutes with kidney disease.
Where this comes from
- NICE — Chronic kidney disease: assessment and management
- Kidney Care UK — eating well
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.
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