Diet for pyelonephritis

What is pyelonephritis?

Pyelonephritis is an inflammation of the kidneys that affects not only the tissue of the affected organ but also its ability to filter the blood and eliminate waste products.

In such a situation, even ordinary foods may place additional strain on the kidneys.

A diet for pyelonephritis is not simply a form of “healthy eating,” but a carefully planned nutritional regimen that helps the body fight the infection and reduces the risk of complications.

In this article, we will discuss what a diet for pyelonephritis involves and how the patient’s diet changes depending on the stage of the condition.

We will also look at the principles that form the basis of nutrition during periods of exacerbation and remission, as well as what should be considered when planning a daily menu.

When the kidneys are inflamed, their filtration capacity decreases.

They become less efficient at eliminating sodium, excess water, and toxic metabolic waste products.

If a person continues to follow their usual diet, with a high intake of salt and protein, the burden on the kidneys increases, while fluid retention and discomfort may become more pronounced.

Which factors should be taken into account?

Recommendations regarding nutrition for pyelonephritis should take the following factors into account:

• reducing all irritating foods;
• maintaining adequate diuresis;
• preventing deficiencies of essential nutrients.

What does a proper diet help achieve?

A proper diet for pyelonephritis addresses several issues at the same time:

1. It reduces osmotic load.
   Less salt means less water retention and a lower risk of high blood pressure.
2. It helps control nitrogenous waste products.
   Protein is necessary, but it should be consumed in moderate amounts. Excess protein leads to increased production of urea, which may be more difficult to eliminate when the kidneys are inflamed.
3. It helps maintain the proper pH of the urine.
   Some foods slightly acidify or alkalize the urine, which may be used to create a less favorable environment for bacterial growth.
4. It maintains an adequate intake of calories and vitamins.
   This type of condition requires sufficient energy, so the diet should not be restrictive to the point of starvation. It is important to consume enough carbohydrates from grains and vegetables, as well as vitamins from fruits and berries approved by the doctor.

What is important when following this type of diet?

• Any changes to the diet for pyelonephritis should always be discussed with a nephrologist or the attending physician.
• Every patient has individual characteristics, including kidney function, the presence and severity of swelling, blood pressure, and any accompanying medical conditions.

For this reason, there is no universal diet. The nutritional plan should be tailored to the individual needs of the patient with pyelonephritis.

Diet during an exacerbation of pyelonephritis

During the acute phase of pyelonephritis, the main goal is to minimize the burden on the kidneys so that the diet does not interfere with treatment.

A diet during an exacerbation of pyelonephritis is based on simple, easily digestible foods prepared using gentle cooking methods.

The main rules are:

1. Minimum salt intake

In practice, this means avoiding the addition of salt during cooking. If necessary, only a very small amount should be added at the table.

Sodium intake is most often limited to 3–5 g per day. The exact amount should be determined by the attending physician.

2. Moderate protein intake

During the first few days, protein intake is reduced, with an emphasis on low-fat sources. These may include boiled turkey or skinless chicken, white fish, low-fat cottage cheese, and low-fat kefir.

Fluid intake should be sufficient, provided there are no contraindications.

In the absence of significant swelling or heart problems, water intake may be increased to 1.5–2 liters per day.

Suitable options include low-mineral still water, weak tea, rosehip infusion, and cranberry drinks. These berries contain substances that may help reduce bacterial activity in the urinary tract.

3. Gentle cooking methods

Suitable methods include steaming, boiling, stewing, and baking without forming a hard crust.

Frying is completely excluded. It increases the fat content of food and produces oxidation products that may be more difficult for the body to process.

4. Small, frequent meals

Ideally, meals should be eaten 4–5 times a day in small portions. This allows metabolic processes to proceed more smoothly, while the kidneys receive a steady rather than a sudden workload.

Diet for chronic pyelonephritis

Nutrition during stable remission

When the acute phase subsides, the diet for chronic pyelonephritis becomes less restrictive, but it should remain balanced and gentle on the kidneys. Its purpose is to help prevent exacerbations and support kidney function over the long term.

The main nutritional principles during the chronic phase are:

1. Stable fluid intake

1.5–2 liters of fluids per day, unless this is contraindicated.

It is best to distribute this amount evenly throughout the day.

2. Balanced protein intake

Protein intake may be increased compared with the acute phase, while excess intake should still be avoided. Lean meat, low-fat fish, and dairy products are preferable.

3. Salt control

Even during remission, salt remains a risk factor. It may contribute to swelling and increase blood pressure. For this reason, it is advisable to become accustomed to using very little salt.

4. A variety of vegetables and grains

These may include buckwheat, oatmeal, rice, potatoes, zucchini, cauliflower, and pumpkin.

They provide complex carbohydrates, fiber, and vitamins.

Comparison of nutrition during exacerbation and chronic pyelonephritis

Nutritional principle	During an exacerbation	During chronic pyelonephritis
Salt	Minimum salt, usually 3–5 g per day as determined by the attending physician	Salt should remain limited and used as little as possible
Protein	Moderate amounts from low-fat sources	Balanced intake without excess
Fluids	Up to 1.5–2 liters in the absence of contraindications	1.5–2 liters per day unless contraindicated
Food preparation	Steamed, boiled, stewed, or baked without a hard crust	Balanced meals that are gentle on the kidneys
Main goal	Minimizing the burden on the kidneys	Preventing exacerbations and supporting kidney function

Which foods should be avoided?

It is important to avoid irritating foods. Spicy seasonings, smoked foods, marinades, and rich broths should not be consumed.

A consultation with the attending physician is necessary in order to prepare a personalized diet and treatment plan.

Only a comprehensive approach – medications, monitoring of blood test results, and a proper, healthy diet – can effectively manage pyelonephritis and support kidney health.