Kidney Diet 7 min read·Updated 22 July 2026 Clinician-reviewed

Are Grapes Good for Your Kidneys?

A UK Consultant Nephrologist on grapes in chronic kidney disease — a renal-diet staple in fresh form, with a clear caveat on raisins and grape juice.

  • 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

Fresh grapes (red, green or black) are kidney-friendly at every CKD stage in normal 80–120 g portions. Raisins are concentrated — limit to a tablespoon. Grape juice is a sugary drink, not a fruit serving.

Key recommendation: Fresh grapes: ~ 190 mg K per 100 g — low.

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

Fresh grapes (red, green or black) are kidney-friendly at every CKD stage in normal 80–120 g portions. Raisins are concentrated — limit to a tablespoon. Grape juice is a sugary drink, not a fruit serving.

Who should be cautious

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

Are Grapes Good for Your Kidneys?

Why grapes fit a renal diet

Grapes consistently appear on UK 'lower-potassium fruit' lists. Features that help CKD patients:

  • Low minerals — sit well within stage-5 targets in normal portions.
  • Polyphenols (resveratrol, catechins, anthocyanins in red/black) — modest cardiovascular benefit.
  • Naturally sweet, satisfying and portable — useful for snacking instead of biscuits.
  • Freeze well — frozen grapes make a refreshing low-K alternative to ice lollies in hot weather.

Fresh vs raisins vs juice

  • Fresh grapes (80 g, ~ 10 grapes) — ~ 150 mg K, ~ 16 mg P, 12 g sugar. Best option.
  • Raisins / sultanas (15 g, 1 tbsp) — ~ 110 mg K, 11 g sugar. Use as a small topping, not a snack.
  • Raisins (30 g handful) — ~ 220 mg K, 22 g sugar. Limit to occasional use.
  • Grape juice (200 ml) — ~ 260 mg K, ~ 32 g sugar. Treat as sugary drink.
  • Wine: a separate issue — see our alcohol-and-kidneys guide.

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.

Portion guidance by CKD stage

  • Stage 1–4: 100–150 g per portion, daily if you like.
  • Stage 5 / dialysis: 80–100 g (small bunch) per portion; check with your dietitian if K is persistently raised.
  • Diabetics: count the natural sugar (~ 16 g per 100 g) toward daily carbs.
  • On warfarin / DOAC: grapes are safe (unlike grapefruit); no interaction.

Practical CKD-friendly ideas

  • Pack a small bag (~ 80 g) of grapes for a workday snack instead of crisps.
  • Halve and freeze for hot-weather hydration without potassium-heavy lollies.
  • Add a few grapes to a cheese plate — sweetness lifts low-salt mild cheese.
  • Sprinkle a tablespoon of raisins onto porridge or salad — don't make handful-snacking a habit.
  • Avoid grape-flavoured squashes and energy gels.
Is Grapefruit Bad for Your Kidneys?
Related reading: Is Grapefruit 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

Fresh grapes (red, green or black) are kidney-friendly at every CKD stage in normal 80–120 g portions. Raisins are concentrated — limit to a tablespoon. Grape juice is a sugary drink, not a fruit serving.

Key takeaways
  • Fresh grapes: ~ 190 mg K per 100 g — low.
  • Raisins: ~ 750 mg K per 100 g — use sparingly.
  • Red grapes contain resveratrol polyphenols.
  • Skin contains most antioxidants — eat with skin.
  • Grape juice: sugar load; portion to 150 ml.
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

Are grapes good for your kidneys?

Yes — fresh grapes are a low-potassium, low-phosphate fruit (~ 190 mg K per 100 g) and a renal dietitian favourite. Red grapes contain resveratrol, a polyphenol with mild cardiovascular benefits.

How much potassium is in grapes?

Fresh grapes contain ~ 190 mg K per 100 g — low for fruit. A typical 80 g portion (~ 10–12 grapes) provides ~ 150 mg K.

Are raisins bad for kidneys?

Raisins are dried grapes — water is removed so potassium and sugar are very concentrated (~ 750 mg K per 100 g). A small tablespoon (15 g) gives ~ 110 mg K; that's fine, but a handful adds up quickly. Limit to one tablespoon as a topping.

Is grape juice OK for CKD?

100 ml grape juice has ~ 130 mg K and ~ 16 g sugar. It raises blood glucose and uric acid sharply. Treat it as an occasional sugary drink, not a fruit serving. Whole grapes are far better.

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 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

No added potassium or phosphate; sensible vitamin doses.

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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