CKD Stages 8 min read·Updated 21 October 2026 Clinician-reviewed

Stage 3 Kidney Disease Diet

A UK Consultant Nephrologist's practical guide to eating well with stage 3 chronic kidney disease (eGFR 30–59) — clear daily targets, what to eat more of, what to cut back on, and when you need a renal dietitian.

  • Clinically Reviewed
  • NHS & NICE Aligned
  • UK Evidence-Based
  • Last Reviewed 21 October 2026

Professor Mohammed Mahdi Althaf

Consultant Nephrologist & Acute Physician

View Credentials

Professor Mohammed Mahdi Althaf

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

Consultant Nephrologist & Acute Physician · GMC 7216325

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Direct answer

At stage 3 CKD, focus on less salt (under 6 g/day), moderate protein (about 0.8 g/kg/day), plenty of vegetables and fruit, fewer ultra-processed foods and normal fluid intake. Potassium and phosphate limits are usually only needed if your blood tests show high levels.

Key recommendation: Salt under 6 g a day is the single most useful change.

Quick answer

✓ Best choices

  • Lower-potassium fruit: apples, pears, berries, grapes, pineapple
  • Vegetables prepared with the leaching method when potassium is a concern
  • Whole grains: oats, basmati rice, pasta, couscous, sourdough
  • Lean protein in measured portions: fish, chicken, eggs, tofu

✓ Foods to limit

  • Added salt and high-sodium processed foods
  • Phosphate additives (E338, E339, E340, E450, E451, E452) in processed meats, fizzy drinks, instant foods
  • Very high-potassium foods if your blood potassium is rising
  • Sugary drinks, energy drinks and ultra-processed snacks

Key takeaway

At stage 3 CKD, focus on less salt (under 6 g/day), moderate protein (about 0.8 g/kg/day), plenty of vegetables and fruit, fewer ultra-processed foods and normal fluid intake. Potassium and phosphate limits are usually only needed if your blood tests show high levels.

Who should be cautious

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

Stage 3 Kidney Disease Diet

Daily nutrient targets for stage 3 CKD

TARGETS (adults, stage 3a and 3b, unless your kidney team advises otherwise):

  • Salt: under 6 g/day (sodium under 2.4 g)
  • Protein: about 0.8 g/kg body weight/day
  • Potassium: no routine limit; restrict only if blood potassium is above 5.5 mmol/L
  • Phosphate: no strict limit; avoid phosphate additives
  • Fluid: 1.5–2 L/day for most people, unless told otherwise
  • Fibre: 25–30 g/day from vegetables, pulses and wholegrains
  • Alcohol: within UK low-risk limits (14 units/week or fewer)

PROFESSOR TIPS: Your targets depend on your blood results, ACR, weight and other conditions such as diabetes. Ask for a referral to a renal dietitian if your potassium, phosphate or weight are a concern.

Foods to eat more of

Eat More

  • Vegetables and salad — aim for at least 5 portions of fruit and veg a day
  • Pulses (lentils, chickpeas, beans) as a protein source a few times a week
  • Wholegrains such as oats, brown rice and wholemeal pasta
  • Oily fish once a week (salmon, mackerel, sardines)
  • Olive or rapeseed oil instead of butter
  • Herbs, spices, lemon and garlic to flavour food without salt

Why it matters: plant-rich diets are associated with lower blood pressure and better cardiovascular health — the leading cause of complications in CKD.

Foods to cut back on

Cut Back

  • Processed meats — bacon, ham, sausages, salami
  • Ready meals, takeaways, instant noodles and packet soups
  • Salty snacks, stock cubes, soy sauce and gravy granules
  • Fizzy colas and processed cheese (phosphate additives)
  • Salt substitutes such as LoSalt — these contain potassium and are not advised in CKD
  • High-dose herbal remedies and supplements without checking with your kidney team

Label Reading

  • High salt: more than 1.5 g per 100 g (red traffic light)
  • Low salt: 0.3 g or less per 100 g (green traffic light)
  • Phosphate additives: look for 'phos' in the ingredients list

Stage 3a vs 3b: does the diet change?

STAGE 3A (eGFR 45–59):

  • Healthy, low-salt eating is usually enough
  • Routine potassium or phosphate restriction not needed

STAGE 3B (eGFR 30–44):

  • Bloods are checked more often, including potassium, bicarbonate, calcium and phosphate
  • Diet changes may become individualised if levels rise
  • A renal dietitian review is worthwhile if you are losing weight unintentionally or have diabetes

MONITORING (NICE NG203): eGFR and urine ACR at least yearly, more often if eGFR is falling or ACR is raised.

A sample day of stage 3 eating

Sample Day

  • Breakfast: porridge made with milk, topped with berries
  • Lunch: wholemeal wrap with chicken, salad and hummus
  • Snack: an apple and a small handful of unsalted nuts
  • Dinner: baked salmon, new potatoes and green beans with lemon and herbs
  • Drinks: water, tea or coffee across the day

For a full week of ideas, see our 7-day CKD meal plan, which follows the same UK renal nutrition principles.

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.

7-Day CKD Meal Plan
Related reading: 7-Day CKD Meal Plan.

Key practical tips

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

  • Build a kidney plate: ½ vegetables and salad, ¼ whole-grain carb, ¼ protein
  • Cook from scratch when you can — it's the easiest way to control hidden salt and phosphate
  • Read labels for sodium ≤ 0.3 g per 100 g (low) and any 'E3-/E4-' phosphate additives
  • Discuss potassium and phosphate targets with your renal dietitian — they vary by stage

Clinical guidance

TL;DR summary

At stage 3 CKD, focus on less salt (under 6 g/day), moderate protein (about 0.8 g/kg/day), plenty of vegetables and fruit, fewer ultra-processed foods and normal fluid intake. Potassium and phosphate limits are usually only needed if your blood tests show high levels.

Key takeaways
  • Salt under 6 g a day is the single most useful change.
  • Protein around 0.8 g/kg/day — no need for high-protein diets.
  • Potassium restriction only if your blood potassium is high.
  • Cut processed foods with phosphate additives.
  • Mediterranean or DASH eating patterns are well evidenced.
Kidney Diet & Nutrition Considerations

At every stage of chronic kidney disease, what you eat shapes how the kidneys cope day-to-day. UK renal guidance (NICE NG203, KDIGO 2024, KDOQI 2020 nutrition) focuses on four levers: sodium (salt), potassium and phosphate awareness, sensible protein intake, and an overall whole-food, Mediterranean-style pattern. Targets are individual — your renal team uses your bloods (eGFR, potassium, phosphate, bicarbonate) to personalise them. Aim for a balanced plate built around vegetables, lower-potassium fruit, whole grains, modest portions of fish or lean protein, and unsaturated fats such as olive oil.

Foods to prioritise

  • Lower-potassium fruit: apples, pears, berries, grapes, pineapple
  • Vegetables prepared with the leaching method when potassium is a concern
  • Whole grains: oats, basmati rice, pasta, couscous, sourdough
  • Lean protein in measured portions: fish, chicken, eggs, tofu
  • Extra virgin olive oil as the main cooking fat (PREDIMED-style pattern)

Foods to limit

  • Added salt and high-sodium processed foods
  • Phosphate additives (E338, E339, E340, E450, E451, E452) in processed meats, fizzy drinks, instant foods
  • Very high-potassium foods if your blood potassium is rising
  • Sugary drinks, energy drinks and ultra-processed snacks

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 is the best diet for stage 3 kidney disease?

For most people with stage 3 CKD, the best-evidenced pattern is a Mediterranean or DASH-style diet: plenty of vegetables, fruit, pulses and wholegrains, moderate protein, less salt and fewer ultra-processed foods. Strict renal restrictions are usually not needed at stage 3 unless your blood tests show a problem.

How much protein should I eat with stage 3 CKD?

UK renal dietitians usually advise around 0.8 g of protein per kg of body weight per day for adults with stage 3 CKD — roughly 56 g a day for a 70 kg adult. Very high-protein diets and high-dose protein supplements are best avoided unless advised by your kidney team.

Do I need to cut potassium at stage 3?

Usually not. Potassium restriction is rarely needed at stage 3 unless a blood test shows high potassium (typically above 5.5 mmol/L), which can happen with some blood pressure medicines. Only restrict potassium if your GP, kidney team or renal dietitian tells you to.

Should I limit phosphate in stage 3 CKD?

Phosphate levels are usually normal at stage 3, so a strict low-phosphate diet is not normally needed. Cutting back on processed foods containing phosphate additives (look for 'phos' in ingredient lists — e.g. E338–E341, E450–E452) is a sensible step for everyone with CKD.

How much salt is allowed with stage 3 kidney disease?

Aim for less than 6 g of salt (about 2.4 g sodium) a day, in line with NICE and UK Kidney Association advice. Most salt comes from bread, processed meats, ready meals, sauces and takeaways rather than the salt shaker.

What is the best diet for chronic kidney disease?

For most adults with CKD the strongest evidence supports a Mediterranean-style, mostly plant-based pattern with reduced salt, sensible protein, and care with phosphate additives and very high-potassium foods. Exact targets for potassium, phosphate, protein and fluid should be set by your renal team based on your eGFR and recent blood results.

Order Kidney Vitality — £31.44, free UK delivery

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 guidance

Aligned with NICE NG203 (chronic kidney disease), UK Kidney Association and British Dietetic Association renal nutrition advice.

Reviewed by a UK Consultant Nephrologist

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

Practical, not restrictive

Clear, achievable targets so you only restrict what your blood tests show you need to.

Compare formulation principles
ComparisonKidney VitalityTypical high-street multivitamin
Added potassium / magnesium / phosphorusNoneVaries — check label
FormulationNamed UK Consultant NephrologistVaries by manufacturer
ManufacturingUK facility: BRCGS / NSF GMPCheck facility certification

Other products vary. Compare their full labels and doses with your clinician; certification is not evidence of clinical efficacy.

Recommended next

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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