Dante Carrillo
While there is no specific diet for PKD, eating well can help manage health problems that can make kidney disease worse, such as high blood pressure. A healthy diet can also help to preserve kidney function and delay kidney function decline. Patients with PKD should focus on controlling their blood pressure, weight, and sodium balance, and limiting their intake of salt, animal protein, phosphorus, and potassium. They should also stay hydrated by drinking plenty of water and eating more fruits and vegetables.
| Characteristics | Values |
|---|---|
| Diet type | DASH (Dietary Approaches to Stop Hypertension) or Mediterranean diet |
| Food groups | Fruits, vegetables, nuts, whole grains, vegetable oils, lean sources of protein |
| Water | Minimum of 3 litres per day |
| Salt | Restricted |
| Phosphorus | Restricted |
| Potassium | Restricted |
| Protein | Restricted, especially animal protein |
| Calories | Sufficient for energy and health |
| Vitamins | Not required if maintaining a balanced and healthy diet |
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What You'll Learn
Limit salt, sodium and phosphorus
While there is no specific diet for people with PKD, eating well can help manage health problems that can make kidney disease worse, such as diabetes and high blood pressure.
Limiting Salt, Sodium and Phosphorus
Salt, sodium and phosphorus should be limited in a PKD diet. Firstly, it is important to note that salt and sodium are linked, as sodium is the main ingredient in salt. Excessive amounts of salt should be avoided, as lowering dietary salt may help in blood pressure control. High blood pressure is common in PKD and can damage the kidneys. Patients should restrict their daily consumption of sodium to 1,500 to 2,300 milligrams. To limit salt and sodium, patients should not add salt to their food when cooking or eating. Instead, they can use fresh herbs, lemon juice, ginger, garlic or other salt-free spices and herbs. Patients should also choose fresh or frozen vegetables instead of canned vegetables, as canned goods tend to be high in sodium. Processed meats, such as ham, bacon and sausages, as well as condiments like soy sauce, BBQ sauce and ketchup, should be limited.
Phosphorus is also important to limit in a PKD diet, as an imbalance becomes more likely as kidney function declines. High phosphorus levels can increase the risk of heart and bone disease and are a big risk factor for cardiovascular disease in people with advanced chronic kidney disease. As kidney function declines, a patient may need to take phosphorus binders to manage phosphorus levels.
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Reduce animal protein
While there is no specific diet for people with PKD, eating well can help manage health problems that can make kidney disease worse, such as diabetes and high blood pressure.
People with PKD may need to manage their protein intake, as the kidneys have to clear waste created when the body uses protein. Eating too much protein can put stress on the kidneys, and studies have shown that eating large amounts of protein may accelerate the progressive decline of kidney function. However, it is important to note that too little protein may also harm your body, as it is needed to perform essential functions such as repairing muscles and bones.
In general, vegetable protein may be healthier for your kidneys than animal protein. This is because, with PKD, the kidneys cannot process too much protein, especially animal protein. Patients with PKD should also limit their phosphorus, potassium and salt intake.
A dietitian can help you create an eating plan that is appropriate for your specific condition. They may suggest a modest restriction of protein to 0.8 g/Kg of body weight (56 grams/day for a 150 LBs patient).
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Eat more fruits and vegetables
While there is no specific diet for people with PKD, eating well can help manage health problems that can make kidney disease worse, like high blood pressure. Eating more fruits and vegetables is a key part of a healthy diet for PKD patients.
Fruits and vegetables are a large part of the Mediterranean diet, which is recommended for PKD patients. This diet includes fruits, vegetables, nuts, whole grains, vegetable oils, and fish. Eating more fruits and vegetables can also help patients reduce their intake of sodium, phosphorus, and potassium, which need to be limited in a renal diet.
Fruits that are suitable for a renal diet include apples, apricots, blueberries, cherries, grapes, lemons, limes, mandarin oranges, peaches, pears, pineapple, plums, raspberries, strawberries, and watermelon. These fruits are tasty and healthy, and some, like pineapple, contain less potassium than other fruits. It is important to note that some fruits, like bananas, tomatoes, and dried fruits, are high in potassium and should be limited.
Similarly, there are many vegetables that are suitable for a renal diet, including arugula, bean sprouts, broccoli, cabbage, carrots, cauliflower, corn, cucumbers, eggplant, garlic, green beans, jalapenos, peas, peppers, raw spinach, summer squash, and zucchini. It is important to note that some vegetables, like potatoes, sweet potatoes, and leafy greens, are high in potassium and should be limited.
In addition to eating more fruits and vegetables, PKD patients should also make sure to drink plenty of water and limit their intake of salt and protein, especially animal protein.
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Stay hydrated
Staying properly hydrated is an important part of managing Polycystic Kidney Disease (PKD). It is recommended that people with PKD drink a minimum of 3 litres of water per day to reduce the risk of kidney stones. This is equivalent to around 100 ounces or 12 cups of water.
Drinking plenty of water helps to flush out excess sodium, or salt, from the body. As PKD progresses, kidney function declines, and the kidneys are not able to filter fluids as effectively. This can result in a buildup of sodium, which directly affects blood pressure, often raising it to levels that require a diagnosis of hypertension, or high blood pressure. By staying hydrated, the body is better able to maintain a healthy sodium balance, which in turn keeps blood pressure within acceptable ranges.
It is important to note that fluid intake may need to be limited in some cases, as excessive fluid intake can also put a strain on the kidneys. Therefore, it is always best to consult with a doctor or dietitian to determine the appropriate fluid intake for your specific needs. They may recommend limiting fluid intake to a certain amount per day or suggest specific times of day to increase fluid intake, such as drinking more fluids during the day and less in the evening to reduce the number of nighttime bathroom trips.
In addition to water, other fluids can also contribute to hydration. However, it is important to be mindful of the sodium and sugar content of these beverages. Beverages such as sports drinks, fruit juices, and even some types of tea and coffee can contain high levels of sodium or sugar, which can be harmful to people with PKD. Therefore, it is generally recommended to stick to water as the primary source of hydration.
Finally, staying hydrated is not just about the amount of water consumed but also about the overall fluid balance in the body. This includes being mindful of water loss through activities such as sweating, especially in hot or humid environments. In these cases, it is important to increase water intake to compensate for the fluid loss and maintain proper hydration levels.
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Limit potassium
While there is no specific diet for people with PKD, eating well can help manage health problems that can make kidney disease worse, such as diabetes and high blood pressure. It is important to note that the amount of protein a person with PKD needs varies and is based on body weight. As kidney function declines, nutritional needs change.
If you have PKD, it is recommended to limit your potassium intake. Potassium is a nutrient that plays an important role in the body's fluid balance, muscle contractions, and nerve signaling. Its primary role is to maintain the fluid level balance inside your cells. Potassium is an important mineral found in many body functions, and people with kidney disease must monitor their levels. If too much potassium builds up in the blood, it can prevent the heart from working properly. Eating excessive amounts of foods that are particularly high in potassium, such as melons, vegetable juice, and low-sodium foods with potassium chloride, may lead to fatal complications.
However, it is important to note that a diet rich in potassium has benefits for people with PKD. Potassium helps to lower blood pressure by relaxing blood vessels and contributing to lower blood pressure. It also helps to limit the negative effects of sodium by aiding the excretion of more sodium in urine. Additionally, studies have shown that a potassium intake of more than 3,500 mg per day is associated with the lowest stroke risk. A diet rich in potassium and low in sodium is particularly beneficial for people with PKD as it helps protect against kidney stones, which PKD patients are at risk of forming.
It is recommended to work with a dietitian to determine the right amount of potassium for your individual needs. They can help you identify how much potassium is in your favorite foods and put together a healthy eating plan. If you want to include high-potassium vegetables in your diet, leaching them can help lower the amount of potassium. Leaching involves soaking the vegetables in warm unsalted water for a minimum of 2 hours, using ten times the amount of water as the amount of vegetable. For example, one cup of vegetables requires ten cups of water. Another way to lower the amount of extra potassium in your diet is to avoid drinking or using the liquid from canned fruits, canned vegetables, or the juices from cooked meat.
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Frequently asked questions
There is no one-size-fits-all diet for patients with PKD, but there are some general guidelines and recommendations that can help manage the condition. It is important to consult a doctor or a registered dietitian to determine the best course of action for an individual's specific needs. That being said, some key things to consider include:
- Limiting salt/sodium intake to help control blood pressure.
- Limiting animal protein and focusing on plant-based sources of protein.
- Following a well-balanced and healthy diet, such as the DASH or Mediterranean diets, which emphasise fruits, vegetables, whole grains, and lean sources of protein.
- Staying hydrated by drinking enough water to reduce the risk of kidney stones.
It is recommended to include a variety of nutrient-dense foods from different food groups, such as:
- Fruits: apples, apricots, blueberries, grapes, citrus fruits, etc.
- Vegetables: broccoli, carrots, garlic, spinach, zucchini, etc.
- Whole grains: brown rice, whole wheat bread, etc.
- Lean sources of protein: fish, poultry, nuts, etc.
- Dairy: milk, yoghurt, cheese, etc.
Some foods that should be limited or avoided include:
- High-sodium foods: processed foods, canned foods, foods with preservatives.
- High-phosphorus foods: meat, chicken, legumes, dairy, nuts.
- High-potassium foods: bananas, avocados, potatoes, tomatoes, yogurt, etc.
- Sugary foods and snacks: sweets, cereals, etc.
