Eating Well with Early Chronic Kidney Disease

Chronic kidney disease (CKD) is a long-term condition where the kidneys do not work as well as they should. CKD is divided into 5 stages. In this article we'll look at diet in stages 1-3b (early‑stage chronic kidney disease).

Being diagnosed with early‑stage chronic kidney disease can feel worrying, but it is important to know that these stages of kidney disease are often manageable. Many people live well for years with early CKD, particularly when medical treatment and nutrition work together.

The importance of nutrition in early stage CKD

Good nutrition plays a key role in supporting your kidney health, heart health, and long‑term outcomes. Importantly, early CKD nutrition is about prevention and optimisation, not restricting foods. Making healthy food choices can help:

• Slow the progression of your kidney disease
• Provide energy for daily life  
• Support your immune system and reduce infection risk
• Maintain muscle mass and strength
• Help you achieve and maintain a healthy weight 

A well‑balanced diet provides the right balance of protein, calories, vitamins, and minerals each day. But there is no single “correct” eating plan for everyone with CKD. What you can or cannot eat can change over time depending on your kidney function, medications, and other health conditions. This is why flexible, individualised advice matters

Let's look at the basics of eating well with early CKD, before talking about when seeing a dietitian might be helpful.

Understanding CKD Stages 1–3  

Your kidneys filter waste and excess fluid from the blood. Kidney function is often measured using something called estimated glomerular filtration rate — eGFR for short. In CKD stages 1–3, your kidneys function is reduced but still reasonably effective.

At this stage, any dietary changes are focused on supporting your kidneys and reducing strain, rather than severe restrictions on any foods.

Many people are encouraged to follow a Mediterranean‑style eating pattern. This emphasises plenty of vegetables, fruits, wholegrains, beans and pulses, healthy fats, and moderate amounts of protein.

Protein: Getting the Balance Right 

You might have heard that high‑protein diets aren't recommended for people with CKD, as excessive protein intake may increase kidney workload. This is because when your body digests and uses protein, it produces various waste products that your kidneys then have to filter out.

But protein is essential. Your body needs it to build muscle, repair tissues, and keep your immune system working. The goal in early CKD is to get enough protein - but not too much.

Very high‑protein diets, particularly those relying heavily on supplements and large portions of meat, can place additional strain on the kidneys. But cutting back too much can lead to muscle loss, weakness, and poor nutritional status.

Here are a few good principles to follow: 

• Eat regular meals throughout the day
• Aim for a good-quality protein source at two meals each day
• Avoid large protein portions or protein supplements unless your dietitian or medical team has advised otherwise.

Plant‑based proteins tend to be gentler on the kidneys than animal proteins. This is partly because plant proteins produce less acid when they are broken down and digested, which may reduce stress on the kidneys.

Plant‑based protein sources include: 

• Lentils 
• Beans and pulses 
• Unsalted nuts 

Animal‑based protein sources include: 

• Chicken and turkey 
• Meat such as beef, lamb, veal, and pork 
• Eggs 
• Fish 
• Seafood such as prawns 

Everyone's protein needs are a little different. The right amount for you will depend on:

• Your bodyweight 
• Your age (older adults and adolescents often need a little more) 
• The amount of protein present in urine 
• The underlying cause of your kidney disease 

A registered dietitian can work out the right level for you and adjust it as things change over time. As a rough guide though, a reasonable protein portion looks something like:

• Two slices of chicken in a sandwich
• A small chicken breast (~ 100g)
• Two eggs
• Half a tin of beans or lentils or a handful of nuts.  

Salt: Protecting Kidneys and the Heart 

Eating lots of salt can increase blood pressure and speed up kidney damage, as well as increasing your risk of heart disease. 

The advice for individuals with early-stage CKD is to consume no more than 6g of salt per day. Around 75% of the salt we eat is hidden in processed foods as a preservative or flavour enhancer. High salt foods include baked beans, gravy granules, olives, ham, crisps, bread, soups, shop brought sauces, tinned meats, processed cheese, stock cubes and marmite for example.  

Reducing salt does not mean food has to taste bland. Your taste buds do adjust over time, so if things taste a little different at first, stick with it - it does get easier.

Some practical ways to cut back on salt:

• Cooking more meals from scratch where possible 
• Flavouring foods with herbs, spices, lemon, garlic, and pepper instead of salt 
• Reading food labels and choosing lower‑salt options - aiming for 0.3g salt/100g  
• Limiting processed foods, ready meals, takeaways, and salty snacks 
• Avoid salt substitutes as these often contain a significant amount of sodium  

Even modest reductions in salt can meaningfully lower blood pressure and take some pressure off your kidneys.  

How to eat a balanced diet to support early stage CKD

Good nutrition supports more than just your kidneys - it also benefits your heart, your energy levels, and your overall metabolic health. Try to build your meals around:

• Fruits and vegetables without unnecessary fear - most people with early CKD do not need to avoid them. You should aim for at least 5 portions per day. A portion is equal to 80g serving, such as
  • 1 apple, 7 strawberries, 3 heaped tabslepoons of peas or corn, two satsumas or two florets of broccoli.  

• Wholegrains such as brown rice, rye or wholemeal bread, and wholewheat pasta - these provide fibre and support gut health
• Healthy fats such as olive oil, nuts, seeds, and oily fish 

Restricting foods too early or without clinical need often does more harm than good. Balance and variety are what matter most. 

Fluid and Hydration: Quality Over Quantity

A common myth is that people with CKD should drink as little as possible. For most people in stages 1–3, there is no need to restrict fluids [13]. The goal is simply to stay consistently and adequately hydrated. A good sign you're on track? You're weeing regularly and your urine is a pale yellow colour.

If your kidney function changes, your healthcare team will let you know whether your fluid intake needs adjusting.

It's worth remembering that fluids include anything that is liquid at room temperature, such as:

• Water, squash and other drinks  
• Soups 
• Ice cream and frozen desserts 

Weight, Blood Sugar, and Cholesterol 

What you eat can influence several factors linked to CKD progression, including your weight, blood sugar control, and cholesterol levels.

Eating regular meals built around nutritious, varied foods can help keep your weight, blood sugar and cholesterol in a healthy range and reduce the strain on both your kidneys and your heart. 

When to See a Dietitian 

Getting dietary support early in CKD can prevent a lot of confusion, anxiety, and misinformation. A renal or specialist dietitian can:

• Give you personalised guidance based on your specific situation
• Adapt their advice as your needs change over time
• Help you avoid cutting out foods unnecessarily

Seeing a dietitian early doesn't mean you'll be handed a long list of restrictions - more often than not, it's the opposite.

If you'd like to see a renal dietitian, ask your healthcare team for a referral. Alternatively, you can get help from a renal specialist dietitian working in private practice on the BDA's register.

Key Take‑Home Message

Nutrition in early CKD is about looking after your body, not depriving it. With the right balance, food can support your kidney health, protect your heart, and help you feel your best day to day. Small, sustainable changes made early can have a powerful impact in the long run.