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10 Dietary Tips to Help Preserve Your Kidney Function
The kidneys play an essential role in removing toxins, regulating fluid and mineral balance, and producing certain hormones. An appropriate diet can help slow the progression of kidney disease and preserve kidney function for as long as possible.
Here are 10 tips for adopting a kidney-friendly diet34,35 :
1/ Control your salt intake
Excess salt contributes to high blood pressure and increases the workload on the kidneys. It is recommended not to exceed 6 g of salt per day. Use herbs, spices and lemon to flavour your meals instead of table salt. Limit processed foods, cured meats and ready meals that are high in sodium.
2/ Follow a balanced protein intake
Protein is essential, but excessive intake can accelerate kidney deterioration. Before dialysis, it is generally recommended to consume between 0.8 and 1 g of protein per kilogram of body weight per day. Favour plant-based proteins (such as pulses and whole grains), which produce fewer metabolic waste products.
3/ Monitor your potassium intake
Potassium is essential for healthy muscle and heart function, but excess levels can become dangerous in advanced kidney disease. Limit foods rich in potassium such as bananas, potatoes, spinach and tomatoes. Soaking vegetables and changing the cooking water can help reduce their potassium content.
4/ Moderate your phosphorus intake
High phosphorus levels in the blood can weaken bones and contribute to cardiovascular disease. Reduce intake of dairy products, fizzy drinks, processed foods and processed meats. Choose natural calcium sources such as green vegetables.
5/ Stay properly hydrated
Water helps the kidneys filter toxins. The ideal amount varies depending on your health condition and your doctor’s recommendations. In advanced kidney disease, fluid restriction may be necessary to avoid fluid retention.
6/ Choose a more alkaline diet
Kidney disease can make the blood more acidic. To help restore balance, increase your intake of alkalising foods such as fresh fruit and vegetables, and reduce acidifying foods such as red meat, cheese and refined cereals.
7/ Avoid ultra-processed foods
Food additives, preservatives and colourings found in ready meals, fast food and fizzy drinks increase the toxic burden on the kidneys. Whenever possible, choose homemade meals prepared with fresh, natural ingredients.
8/ Manage your sugar and refined carbohydrate intake
Diabetes is one of the leading causes of kidney disease. To help stabilise blood sugar levels, favour complex carbohydrates (whole grains, pulses) and limit fast sugars such as pastries, fizzy drinks and sweets.
9/ 9/ Be cautious with medications and food supplements
Certain non-steroidal anti-inflammatory drugs (NSAIDs) and dietary supplements (particularly herbal products) may be harmful to the kidneys. Always seek medical advice before taking any medication or supplement.
10/10/ Follow a varied diet adapted to your stage of kidney disease
Nutritional needs vary according to disease progression. Regular follow-up with a dietitian or nephrologist is essential to adapt your diet and preserve kidney function as effectively as possible.
Taking care of your kidneys begins with a balanced diet rich in natural foods. By adopting these healthy habits, you can help preserve kidney function and improve your quality of life.