Dante Carrillo
A renal diet is essential for those with compromised kidney function. When the kidneys fail, they can no longer remove excess potassium, sodium, phosphorus, and protein, so these nutrients build up in the body. This can cause serious health issues, including nerve and muscle problems, and even heart failure. A renal diet is one that is low in these nutrients and emphasizes the importance of consuming high-quality protein. It also usually involves limiting fluids. People with kidney disease may need to work with a dietitian to develop a meal plan that includes foods they enjoy while maintaining their kidney health.
| Characteristics | Values |
|---|---|
| Sodium | Less than 2,300 milligrams per day |
| Potassium | Limit foods that are high in potassium, such as bananas, avocados, milk, meat, oranges, orange juice, cantaloupe, dried fruits, winter squash, and salt substitutes |
| Phosphorus | Limit phosphorus-rich foods such as dairy products, meat, beans, nuts, whole-grain bread, and dark-colored sodas |
| Protein | Limit or adjust the type of protein consumed, such as eating more lean proteins like whole eggs and skinless chicken or turkey |
| Fluids | Limit water and fluids, including soups, ice cream, gelatin, and some fruits and vegetables |
| Alcohol | No more than one drink per day for women and no more than two drinks per day for men |
| Vitamins and Supplements | Avoid herbal supplements and check with a doctor before taking any vitamins or supplements |
| Sugar | Limit sugar intake, especially for those with diabetes |
| Salt | Eat less salt, including salt substitutes unless advised otherwise by a doctor or dietitian |
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What You'll Learn
High phosphorus foods
A kidney-friendly diet is one that helps you stay healthy and slows down damage to your kidneys. It includes foods that are easy on your kidneys and limits other foods and fluids so certain minerals in those foods, like potassium, sodium, and phosphorus, do not build up to high levels in your body.
Phosphorus is a mineral found in your bones and is needed to build strong, healthy bones and keep other parts of your body healthy. When your kidneys are working normally, they remove extra phosphorus from your blood. However, when your kidneys are damaged, they cannot remove phosphorus effectively, leading to a buildup of phosphorus in the blood. This can pull calcium from your bones, making them weak and increasing the risk of fractures.
People with kidney disease may need to limit their phosphorus intake. Phosphorus is found in most foods, but some foods are particularly rich sources. Here are some foods that are high in phosphorus:
- Organ meats: Organ meats such as beef brain and liver are excellent sources of highly absorbable phosphorus. One 3.5 oz (100 g) serving of pan-fried cow's brain contains about 31%-36% of the daily value (DV) of phosphorus. Organ meats are also rich in other nutrients like vitamin A, vitamin B12, and iron.
- Seafood: Certain types of seafood are good sources of phosphorus. Cuttlefish, a mollusk related to squid and octopus, is one of the richest sources, providing 387 mg of phosphorus per 3.5 oz (100 g) cooked serving. Salmon, sardines, and mackerel are also good sources and provide anti-inflammatory omega-3 fatty acids.
- Poultry: Chicken and turkey, especially the light meat, are high in phosphorus. Each 3.5 oz (100 g) serving provides over 18% of the DV. Roasting preserves more phosphorus than boiling.
- Dairy: Dairy products are natural sources of phosphorus. One cup (240 mL) of whole milk provides 205 mg of phosphorus. However, consuming too much dairy in conjunction with other phosphorus-rich foods can be detrimental to bone health in those with kidney disease.
- Whole grains: Whole grains like wheat, oats, and rice contain significant amounts of phosphorus. Soaking, sprouting, or fermenting these grains may enhance phosphorus absorption. Ancient grains like amaranth and quinoa are also good sources, with each cooked cup providing at least 20% of the DV.
- Soy: Soy is enjoyed in many forms, with some being higher in phosphorus than others. Mature soybeans are particularly rich in phosphorus, providing 421 mg per cup (172 g), which is over 24% of the DV. Fermented soy products like tempeh and natto are also good sources.
It is important to note that the specific dietary restrictions related to phosphorus intake will depend on the stage of kidney disease and individual health factors. Those with kidney disease should work with a registered dietitian to develop a meal plan that meets their nutritional needs while maintaining kidney health. Additionally, phosphate binders may be prescribed by a doctor to help manage phosphorus levels in the body.
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Potassium-rich foods
A diet high in potassium can cause renal failure, as damaged kidneys allow potassium to build up in the blood, which can cause serious heart problems. Therefore, it is important to monitor your potassium intake if you have kidney disease.
Potassium is a mineral that is essential for normal cell function. Most healthy people should aim for 4,700 milligrams a day, but few Americans get this amount. It is recommended to get potassium from foods rather than supplements. Potassium-rich foods include many fruits, vegetables, beans, and legumes.
- Bananas
- Avocados
- Sweet potatoes
- Spinach
- Coconut water
- Dried apricots
- Baked potatoes
- Soybeans
- Oranges
- Cantaloupes
- Honeydew
- Grapefruit
- Prunes
- Raisins
- Dates
- Milk
- Yoghurt
- Beans
- Peas
- Lentils
- Chickpeas
- Soybeans
- Peanuts
- Fatty fish (salmon, tuna)
- Pomegranates
- Carrots
- Tomatoes
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High protein intake
While protein is an essential part of our diet, helping to keep our skin, hair, and nails healthy, excessive protein intake can have adverse effects on our kidneys. When the body uses protein, it produces waste products that the kidneys must filter. This means that a high protein intake can cause the kidneys to work harder and, in turn, lead to more damage.
Several observational studies have shown a link between high-protein diets and kidney function decline in individuals with pre-existing chronic kidney disease (CKD). For example, the Gubbio study found that a higher protein intake was associated with a lower eGFR after 12 years, even in participants without CKD. However, it is important to note that some studies have not observed this association, and long-term randomized clinical trials have generally shown little to no effect on renal function.
The amount of protein considered "high" can vary depending on individual factors such as body size, activity level, and overall health. It is typically defined as a daily consumption of 1.5 g/kg/day or more, which is almost twice the current Recommended Dietary Allowance. Animal sources of protein, such as fatty cuts of red meat, whole-milk dairy products, and egg yolks, tend to be higher in saturated fat and have been associated with an increased risk of end-stage kidney disease (ESKD).
For those with kidney disease, a diet lower in protein is often recommended to reduce the workload on the kidneys. This can be achieved by including more plant-based foods, as they are generally lower in protein and saturated fat while being high in fiber. However, it is crucial to work with a dietitian to determine the appropriate amount and type of protein for your specific needs, as too little protein can lead to malnutrition.
In summary, while high protein intake may not be a direct cause of renal failure, it can contribute to the progression of kidney disease, especially in those with pre-existing conditions. A balanced approach to protein consumption, in consultation with a healthcare professional, is essential to maintaining kidney health.
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Alcohol consumption
Heavy drinking, defined as more than three drinks per day for women and more than four drinks per day for men, has been found to double the risk of kidney disease. Binge drinking, typically consuming four to five drinks within two hours, can cause a sudden drop in kidney function, known as acute kidney injury (AKI). AKI can be life-threatening and, even if it resolves, can lead to permanent kidney damage. Chronic drinking can also cause liver disease, which adds to the kidneys' workload and further impairs their function.
To maintain kidney health, it is important to drink alcohol in moderation or abstain if advised by a healthcare provider. Those with kidney disease may need to limit their alcohol intake to no more than one drink per day for women and no more than two drinks per day for men. It is always advisable to consult with a healthcare professional to determine safe drinking limits.
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Sodium-rich foods
While sodium is a mineral that is naturally found in many foods and is necessary for the body's water balance, a diet rich in sodium can be detrimental to kidney health. When the kidneys are unhealthy, the body can experience a buildup of sodium and fluid, leading to swollen ankles, puffiness, high blood pressure, shortness of breath, and fluid around the heart and lungs.
People with kidney disease, especially those with chronic kidney disease (CKD), need to be cautious about their sodium intake due to its impact on blood pressure and fluid retention. A low-sodium diet is often recommended for those with CKD or requiring dialysis to prevent further damage to the kidneys.
To reduce sodium intake, it is important to limit the consumption of canned, processed, and frozen foods, as well as prepared or packaged foods from supermarkets or restaurants, as these tend to be high in sodium. Cooking meals from scratch using fresh ingredients allows for better control over sodium levels. When cooking, it is advisable to use herbs and spices instead of salt to enhance the flavor of dishes. Reading food labels is crucial to making informed choices, and if salt is listed as one of the first five ingredients, the product is likely high in sodium and should be avoided.
When dining out, it is recommended to request dishes prepared without salt and to ask for sauces or gravies on the side, as these can be high in sodium and should be used sparingly. Consulting with a renal dietitian can help individuals with kidney disease develop a personalized meal plan that considers their specific dietary restrictions and nutritional needs.
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Frequently asked questions
There is no one-size-fits-all diet that causes renal failure. However, a diet high in sodium, phosphorus, and potassium can lead to kidney disease and potentially renal failure if not managed properly.
Sodium is present in high quantities in processed and packaged foods, restaurant food, and canned foods.
Phosphorus is found in dairy products, meat, beans, nuts, whole-grain bread, and dark-colored sodas.
Potassium is found in bananas, milk, meat, oranges, orange juice, cantaloupe, dried fruits, winter squash, salt substitutes, and avocados.
Speak to a doctor or dietitian to develop a meal plan that includes foods you enjoy while maintaining your kidney health.
