Kidney Health 9 min read·Updated 22 July 2026 Clinician-reviewed

Foods to Avoid with Kidney Disease

A UK Consultant Nephrologist on the foods and drinks most often flagged by renal dietitians — and the portions and swaps that let you keep flavour without harming kidney function.

  • Clinically Reviewed
  • NHS & NICE Aligned
  • UK Evidence-Based
  • Last Reviewed 22 July 2026

Professor Mohammed Mahdi Althaf

Consultant Nephrologist & Acute Physician

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Professor Mohammed Mahdi Althaf

MD, MSc, PgDip (Clin Ed), FRCP, FHEA, FASN

Consultant Nephrologist & Acute Physician · GMC 7216325

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Direct answer

The four main targets in CKD are: salt (under 6 g/day), phosphate additives (E338–E452 in processed foods), potassium only if your blood level is high, and sugar-sweetened drinks. Most whole foods are fine in sensible portions — the problem is usually processed and ultra-processed foods.

Key recommendation: Salt: under 6 g/day. Biggest wins from bread, bacon, stock cubes, sauces.

Quick answer

✓ Best choices

  • Vegetables and lower-potassium fruit at every meal
  • Whole grains: oats, basmati rice, pasta, wholegrain bread
  • Lean protein in modest portions: fish, chicken, eggs, tofu
  • Extra virgin olive oil, herbs and spices for flavour

✓ Foods to limit

  • Added salt and salty sauces
  • Processed meats and foods with phosphate additives (E338–E452)
  • Very large portions of bananas, oranges, potatoes if potassium is rising

Key takeaway

The four main targets in CKD are: salt (under 6 g/day), phosphate additives (E338–E452 in processed foods), potassium only if your blood level is high, and sugar-sweetened drinks. Most whole foods are fine in sensible portions — the problem is usually processed and ultra-processed foods.

Who should be cautious

People on dialysis, post-transplant, pregnant or breastfeeding, or taking prescription medication — confirm with your renal team before changes.

Foods to Avoid with Kidney Disease

Salt — the single biggest dietary win

Around 75% of UK salt intake comes from processed food, not the salt shaker. Renal dietitians consistently rank salt reduction as the highest-impact change. Targets: bread (choose lower-salt loaves), bacon/ham/gammon (swap for roast chicken or eggs), stock cubes and gravy granules (use homemade low-salt stock), soy sauce and bottled sauces (use lemon, vinegar, herbs, garlic). Aim for under 6 g salt (2.4 g sodium) per day.

Phosphate additives — the hidden problem

Inorganic phosphate added to processed food (look for E338–E343, E450–E452 on labels) is absorbed far more efficiently than natural food phosphate. Foods to watch: cola and some fizzy drinks, processed cheese slices and cheese sauce, some sausages and processed meats, instant noodles and some ready meals, shop-bought cakes and pastries with raising agents.

Food first. If you are choosing a daily multivitamin alongside a balanced diet, Kidney Vitality was developed by a UK Consultant Nephrologist using renal nutrition principles. See the formulation.

Potassium — only if your blood test says so

Potassium restriction is not automatic in CKD. It is recommended when serum potassium rises above roughly 5.0–5.5 mmol/L, usually in stage 4–5 CKD or on certain medications (ACE inhibitors, ARBs, potassium-sparing diuretics). If restricted: limit bananas, oranges, dried fruit, avocado, tomato paste, spinach, beetroot, salt substitutes containing potassium chloride.

Drinks to limit or avoid

Cola and phosphate-containing soft drinks; energy drinks (caffeine spikes BP, high sugar); large volumes of strong tea or matcha supplements; herbal 'detox' blends (nettle, dandelion, liquorice, noni juice, star fruit); excessive alcohol (> 14 units/week). For most people with early CKD, plain water, diluted squash, and moderate tea/coffee are fine.

Protein — enough, not too much

NICE NG203 advises against very low or very high protein diets in CKD. The UK RNI of ~ 0.75 g/kg/day is a sensible starting point for most adults with stages 1–3. On dialysis, protein needs rise — your renal dietitian will adjust. Avoid excessive red and processed meat; choose fish, poultry, eggs, beans, lentils and tofu in moderate portions.

Is Salt Bad for Your Kidneys?
Related reading: Is Salt Bad for Your Kidneys?.

Key practical tips

Designed for quick scanning — what to order, what to avoid, sensible portions, common mistakes.

  • Read labels: sodium ≤ 0.3 g per 100 g (low) is the target
  • Cook from scratch when you can — it controls the hidden salt and phosphate
  • Personalise potassium and phosphate targets with your renal dietitian

Clinical guidance

TL;DR summary

The four main targets in CKD are: salt (under 6 g/day), phosphate additives (E338–E452 in processed foods), potassium only if your blood level is high, and sugar-sweetened drinks. Most whole foods are fine in sensible portions — the problem is usually processed and ultra-processed foods.

Key takeaways
  • Salt: under 6 g/day. Biggest wins from bread, bacon, stock cubes, sauces.
  • Phosphate additives: E338–E452 in cola, processed cheese, ready meals.
  • Potassium: restrict only if blood K is high — not everyone with CKD.
  • Sugar-sweetened drinks: link diabetes, obesity and CKD progression.
  • Whole foods in sensible portions > strict avoidance lists.
Kidney Diet & Nutrition Considerations

On a kidney-friendly diet, single foods matter less than the overall pattern. Build meals around vegetables, lower-potassium fruit, whole grains, sensible protein and olive oil, and watch the three usual suspects — salt, phosphate additives and oversized portions of very high-potassium foods. Targets are individual and should be confirmed with your renal team.

Foods to prioritise

  • Vegetables and lower-potassium fruit at every meal
  • Whole grains: oats, basmati rice, pasta, wholegrain bread
  • Lean protein in modest portions: fish, chicken, eggs, tofu
  • Extra virgin olive oil, herbs and spices for flavour

Foods to limit

  • Added salt and salty sauces
  • Processed meats and foods with phosphate additives (E338–E452)
  • Very large portions of bananas, oranges, potatoes if potassium is rising

Potassium, phosphate and protein needs vary between individuals — please confirm personal targets with your renal team or dietitian. Browse the Kidney Diet Hub for more guides in this cluster.

Frequently asked questions

What foods should I avoid with kidney disease?

The main foods to limit are: high-salt items (bacon, ham, stock cubes, soy sauce, gravy granules), phosphate-additive processed foods (cola, processed cheese, some ready meals with E338–E452), high-potassium foods only if your blood potassium is raised (bananas, oranges, dried fruit, salt substitutes), and high-oxalate foods if you form calcium-oxalate stones (spinach, rhubarb, beetroot juice).

Are all high-potassium foods banned in CKD?

No. Potassium restriction is only needed if your blood potassium is above the normal range. Many people with stage 1–3 CKD do not need a low-potassium diet at all. If your renal team has not flagged high potassium, focus on salt reduction first.

What drinks should I avoid with kidney disease?

Cola (phosphoric acid and phosphate additives), energy drinks (caffeine, sugar, blood pressure spikes), large amounts of strong black tea or green tea supplements, and herbal 'detox' or 'kidney cleanse' teas (nettle, dandelion, liquorice). Alcohol should stay within UK low-risk limits (≤ 14 units/week).

Can I never eat cheese or chocolate again?

No — portion control, not total avoidance. A 30 g portion of cheddar or a small square of dark chocolate is usually acceptable. The bigger problem is eating large portions daily or stacking phosphate-rich foods at the same meal.

What foods are best for kidney health?

A kidney-friendly diet centres on vegetables, lower-potassium fruit (apples, pears, berries), whole grains (oats, basmati rice, pasta), sensible portions of fish, eggs or lean meat, beans and lentils in modest portions, and olive oil as the main cooking fat — broadly a Mediterranean pattern with reduced salt.

Nutritional challenges in kidney disease

Many people living with kidney disease have to limit foods because of potassium, phosphate, diabetes, dialysis, appetite changes or simply the time it takes to cook from scratch every day. That can make it harder to keep daily nutrition balanced — particularly for vitamins and minerals that food alone may not fully cover.

Kidney Vitality is a UK-formulated daily nutritional support product designed by Consultant Nephrologist Professor Mohammed Mahdi Althaf with renal nutrition in mind from the start. It keeps doses moderate, leaves out added potassium, phosphate and magnesium, and avoids megadose vitamin A — sitting alongside a kidney-friendly diet, not replacing it.

Why Kidney Vitality fits this need

Built around UK renal guidance

Aligned with NICE NG203, KDIGO 2024, FSA and BDA renal nutrition guidance.

Designed by a UK Consultant Nephrologist

Formulated and reviewed by Professor Mohammed Mahdi Althaf (GMC 7216325).

Evidence-based by design

Practical swaps, not forbidden lists. NHS-aligned next steps.

Designed by a UK Consultant Nephrologist

Ready to support your kidney health?

If you have been researching kidney health, supplements, CKD nutrition or kidney-friendly living, Kidney Vitality was developed specifically around those principles by Professor Mohammed Mahdi Althaf (GMC 7216325). Nephrologist Developed Daily Multivitamin.

  • No Added Potassium
  • No Added Phosphorus
  • No Added Iron
  • UK Manufactured
  • One capsule daily
  • UK GMP — BRCGS, NSF GMP, Halal
Subscribe & Save — £20.39/monthCheck your current multivitamin

✓ Free UK tracked delivery  ·  ✓ Delivered every 30 days  ·  ✓ Pause or cancel anytime  ·  ✓ Never run out

ComparisonKidney VitalityTypical high-street multivitamin
Added potassiumNoneOften included
Added phosphateNoneOften included (E338–E452)
Vitamin A (retinol)No megadoseOften high-dose retinol
Kidney-focused formulationYesNo — general population
Consultant Nephrologist involvementYes (GMC 7216325)No
UK GMP manufacturedYes (BRCGS, NSF GMP)Varies

Food supplement. Not a medicine and not a treatment for kidney disease. Speak with your GP, pharmacist or renal team before starting any new supplement, especially in advanced CKD, on dialysis, post-transplant, pregnant or breastfeeding.

Clinical reviewer

Professor Mohammed Mahdi Althaf

Consultant Nephrologist

Acute Physician

GMC 7216325

View Full Biography

Professor Mohammed Mahdi Althaf is a UK Consultant Nephrologist and Acute Physician with a special interest in chronic kidney disease, AKI prevention and renal nutrition. He combines hospital practice with patient education and clinical guidance review.

View professional profile →
View Credentials
  • MD
  • MSc
  • PgDip (Clin Ed)
  • FRCP
  • FHEA
  • FASN

About this article

Written for UK patients and based on:

  • NICE guidance
  • NHS resources
  • British Dietetic Association guidance
  • Kidney Care UK resources
View methodology

Each article is researched against current UK clinical guidance (NICE NG203, NG118, NG136), NHS patient resources, KDIGO and KDOQI international guidelines, and the British Dietetic Association Renal Nutrition Group. Drafts are written by the Kidney Vitality editorial team and reviewed by a UK Consultant Nephrologist before publication. Content is reviewed on a rolling basis and updated when guidance changes.

Editorial standards

  • Clinically reviewed
  • NHS-aligned
  • NICE-aligned
  • Evidence-based
  • Reviewed before publication
View full editorial process

Every article is researched and written by the Kidney Vitality editorial team using current UK clinical guidance (NICE NG203, NG118, NG136), NHS patient resources, KDIGO/KDOQI international guidelines, and British Dietetic Association renal nutrition guidance. Drafts are reviewed for clinical accuracy by Professor Mohammed Mahdi Althaf, MD, MSc, PgDip (Clin Ed), FRCP, FHEA, FASN (Consultant Nephrologist & Acute Physician, GMC 7216325) before publication. Content is updated when UK guidance changes.

References (4)View Sources
  1. NICE NG203: Chronic kidney disease — assessment and management
  2. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
  3. KDOQI Clinical Practice Guideline for Nutrition in CKD: 2020 Update
  4. British Dietetic Association — Renal Nutrition Group

Medical disclaimer

This content is educational only and does not replace personalised medical advice.

Read full disclaimer

This page is general information, not personal medical advice. If you have chronic kidney disease, are on dialysis, have had a kidney transplant, are pregnant or breastfeeding, or take prescription medication, please confirm any supplement with your GP, pharmacist or renal team before starting.

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