Jeffrey Salazar
A renal or kidney diet is often recommended for people with kidney disease to slow down the progression of kidney damage and improve their overall health. The diet typically includes limiting fluids, eating a low-protein diet, reducing salt, potassium, phosphorous, and other electrolytes, and getting enough calories. The type and amount of protein, sodium, and potassium consumed are particularly important for people with kidney disease, as their kidneys may not be able to effectively remove the waste products from these substances. People with kidney disease should work with a renal dietitian to develop a meal plan that includes foods they enjoy while maintaining their kidney health and managing phosphorus, sodium, and potassium levels.
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What You'll Learn
Limit sodium, phosphorus, and potassium
For renal failure patients, it is important to limit sodium, phosphorus, and potassium intake. This is because as kidney function decreases, the body loses its ability to remove excess amounts of these minerals, which can lead to serious health complications.
Sodium
Sodium is a mineral that is essential for the body to function, as it helps nerves and muscles work correctly and controls fluid levels and blood pressure. However, when the kidneys are not functioning properly, consuming too much sodium can lead to high blood pressure, discomfort during dialysis, and fluid buildup around the heart and lungs. Renal failure patients should aim to consume less than 2300 milligrams of sodium per day. To achieve this, it is recommended to cook meals from scratch, as prepared and packaged foods tend to be high in sodium. Patients should also be aware of hidden sources of sodium, such as poultry products that are often soaked in a saltwater solution. Checking food labels is important, and patients should look for products with no more than 6 to 10% daily value for sodium.
Phosphorus
As kidney function declines, phosphorus can build up in the blood, leading to serious health issues. Excess phosphorus in the blood pulls calcium from the bones, causing them to become weak and brittle. High phosphorus levels can also cause itchy skin and bone and joint pain. Renal failure patients should be mindful of this and check ingredient labels for phosphorus or words containing "PHOS". Deli meats and some fresh meat and poultry products may contain added phosphorus.
Potassium
When kidney function is impaired, the body may not be able to remove excess potassium, leading to a condition called hyperkalemia. This can cause muscle weakness, nausea, and irregular heart function, including changes in heart rhythm. Renal failure patients should be cautious about their potassium intake and may need to substitute lower-potassium foods for higher-potassium choices. It is important to note that some low-sodium products use potassium chloride as a substitute, which could be harmful to those on a potassium-restricted diet. Patients should consult a healthcare professional or dietitian to determine their individual needs and ensure they are getting the right amount of potassium.
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Control fluid intake
For patients with renal failure, controlling fluid intake is an important aspect of their diet and overall health. The kidneys are responsible for maintaining fluid balance in the body and when they fail, managing fluid intake becomes crucial to prevent complications.
In the early stages of renal failure, patients may not need to restrict their fluid intake. However, as the condition progresses or when undergoing dialysis, monitoring and limiting fluid intake become crucial. This is because, during dialysis, the body's ability to remove waste and fluids is compromised, leading to a risk of fluid buildup.
The buildup of fluid in the body can have serious consequences. Excess fluid can lead to swelling (edema) in various parts of the body, such as the feet, ankles, wrists, and face. More critically, it can affect other organs, including the heart and lungs, potentially causing shortness of breath and even heart failure. Therefore, controlling fluid intake is a vital aspect of managing renal failure.
To manage fluid intake effectively, patients with renal failure should work closely with their healthcare team, including nephrology nurses and dietitians. These specialists can provide guidance on how much fluid the patient should consume daily, taking into account individual factors such as weight gain between treatments, urine output, and swelling. It is important to note that fluid restriction may vary for each patient, and their specific needs should be addressed.
There are several strategies that patients can employ to control their fluid intake. These include:
- Keeping a record of fluid intake: Patients can use cups at home to measure and track the amount of fluid they consume.
- Managing thirst: Reducing salt and sugar intake can help control thirst. Salt increases thirst and can worsen fluid overload symptoms.
- Using ice: Some patients find that sucking on ice or frozen approved fruit juices is more satisfying than drinking liquids.
- Substituting liquids: Patients can try swallowing pills with applesauce or mouthwash instead of water.
- Managing diabetes: For diabetic patients, maintaining good blood glucose control helps manage thirst and, consequently, fluid intake.
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Eat high-quality protein
For patients with renal failure, it is important to eat high-quality protein. This is because, with kidney disease, the kidneys fail to remove protein waste, which then accumulates in the blood. As such, it is recommended to eat smaller portions of protein at meals and as snacks.
High-quality protein sources for those with kidney disease include beans and lentils (in small amounts, as they also contain phosphorus), fish or seafood, lean beef (such as sirloin or tenderloin), skinless poultry, eggs, and plant-based proteins. A portion of cooked beans is about half a cup, while a portion of meat, fish, or poultry is about 2 to 3 ounces, or about the size of a deck of cards.
It is important to note that the recommended amount of protein can vary depending on the stage of kidney disease. In the early stages, there may be few, if any, restrictions on protein intake. However, as the disease progresses, a low-protein diet may be recommended to prevent the buildup of waste products in the body. This is because, in the later stages of kidney disease, the kidneys may not be able to effectively remove protein waste, leading to a dangerous accumulation in the body.
It is always best to consult with a doctor or dietitian to determine the appropriate amount and sources of protein for your specific needs and the stage of your kidney disease. They can help you create a renal diet plan that is tailored to your individual needs and preferences, ensuring you get the right balance of nutrients while also managing your kidney health.
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Limit dairy products
When managing renal failure, it is important to limit certain foods to keep the levels of electrolytes, minerals, and fluids in the body balanced. Dairy products, for example, are nutrient-rich and a good source of protein, but they can be detrimental to bone health in those with kidney disease. This is because dairy products are a natural source of phosphorus and potassium. When the kidneys are damaged, too much phosphorus consumption can cause a buildup of phosphorus in the blood, pulling calcium from bones and making them weak and prone to breaking.
A renal diet typically involves limiting dairy products to avoid the buildup of protein waste in the blood. While milk is often recommended for strong bones and muscle health, its phosphorus content may weaken bones in those with kidney disease. A cup of whole milk provides 205 mg of phosphorus and 322 mg of potassium. Dairy products are also high in protein, with a cup of whole milk providing nearly 8 g of protein.
Dairy alternatives like coconut milk, unenriched rice milk, and almond milk are much lower in potassium, phosphorus, and protein than cow’s milk, making them good substitutes while on a renal diet. Those on a renal diet should also consider limiting their intake of green, leafy vegetables like Swiss chard, spinach, and beet greens, which are high in potassium.
It is important to note that dietary changes for those with kidney disease may vary depending on the stage of the disease. People with kidney disease should work with a registered dietitian to develop a meal plan that includes foods they enjoy while maintaining their kidney health.
In addition to limiting dairy products, people with renal failure may need to limit their intake of sodium, potassium, and phosphorus. They should also aim to consume enough calories to prevent the breakdown of body tissue and limit fluids if their condition worsens or if they are on dialysis.
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Consume iron-rich foods
Consuming iron-rich foods is essential for people with renal failure, as iron is a mineral that promotes healthy red blood cell production and overall good health. When the kidneys fail, they may not signal the body to produce red blood cells, leading to anaemia. This condition, commonly associated with chronic kidney disease, causes a drop in energy levels due to insufficient oxygen being carried throughout the body.
There are several ways to increase iron intake, including dietary changes and supplements. Dietary sources of iron include both animal and plant-based options. Red meats, such as beef, pork, and liver, are excellent sources of heme iron. Poultry, like chicken, and seafood also provide substantial amounts of iron. For those who enjoy seafood, there is a variety to choose from. It is important to note that eggs, particularly the yolks, are also a good source of iron, providing 0.8 mg per large egg.
However, for those on a low-protein diet, animal-based sources may be limited. In such cases, plant-based alternatives can be excellent substitutes. Beans, legumes, nuts, and seeds can provide a significant amount of iron while also offering plant-based protein, fibre, and other essential vitamins and minerals. Additionally, dried and certain fresh fruits can contribute to iron intake, although it is important to monitor potassium intake when consuming dried fruits.
For those who enjoy spices, herbs like thyme can provide a surprising boost of iron to meals, enhancing flavour while also reducing sodium intake. Fortified foods, such as iron-fortified cereals and grain products, can also help increase iron consumption. However, it is important to consult with a registered dietitian or healthcare professional to determine the appropriate level of iron for your specific needs and to ensure that any dietary changes or supplements are safe and suitable for your overall health.
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Frequently asked questions
A renal diet is a way of eating that helps protect the kidneys from further damage. It involves limiting certain foods and fluids to prevent a buildup of waste, electrolytes, minerals, and fluid in the body. A renal diet is typically low in sodium, phosphorus, and sometimes potassium and protein.
Foods high in sodium, such as table salt and processed foods, should be limited. Phosphorus is also found in many foods, including packaged foods with added phosphorus, so patients should be mindful of their phosphorus intake. Potassium is found in many fruits and vegetables, so patients may need to limit their intake of these foods. In addition, patients may need to cut back on foods high in protein, especially animal protein, such as meats, seafood, and dairy products.
A renal diet includes fresh fruits and vegetables, whole grains, and lean meats. Good sources of protein include beans and lentils (in small amounts), fish or seafood, lean beef, and skinless poultry.
Patients should cook at home using fresh ingredients instead of eating processed or fast food, which tends to be high in sodium. It is also important to read labels on packaged foods and avoid those with added phosphorus or potassium. Patients should also be mindful of their fluid intake, especially if they are on dialysis, as fluid can build up in the body and lead to serious health issues.
Anyone with kidney disease should consider a renal diet, as it can help slow kidney damage and improve overall health. Patients with early-stage kidney disease may not need to restrict their diet, but as the condition progresses, they may need to make changes to their diet, such as limiting fluids and certain foods. It is important to work with a doctor or dietitian to determine the best course of action for your specific needs.
