13 Best Superfoods to Boost Kidney Health

CNET

20-05-2025

It's no secret that your kidneys are really important for your overall health. According to the US Centers for Disease Control and Prevention, more than one in seven adults in the United States has chronic kidney disease. Your kidneys work around the clock to filter out waste and excess fluid, helping to prevent serious health problems like heart disease, infections, anemia, depression and even loss of appetite.
Your diet and gut health also play a major role in your wellness, especially when it comes to keeping your kidneys healthy. There are 13 superfoods you should keep in mind when considering natural ways to give your kidney health a boost.
Read more: 6 Important Blood Tests You May Need for Your Overall Health
13 superfoods for kidney health
1. Cabbage
This nutrient-dense vegetable is low in both potassium and sodium while packing in fiber, vitamins C and K and more.
Plus, cabbage is versatile. You can use it in salads and slaws, but you can also use it as a wrap for tacos, sandwiches and more.
2. Fatty fish
Fish delivers protein, and when you choose a fatty fish like tuna, salmon or trout, you're also getting omega-3 fatty acids. Omega-3 fats may help reduce fat levels (triglycerides) in the blood and may also lower blood pressure, according to the National Kidney Foundation.
If you have CKD, you may need to keep an eye on the phosphorus and potassium levels of the fish you choose. The National Kidney Foundation has a chart you can use to determine levels in specific types of fish. Although, it's best to consult with your doctor.
Jacobs3. Bell peppers
Like cabbage, bell peppers pack in lots of good nutrients with low levels of potassium. With them, you get vitamins B6, B9, C and K, plus fiber. They deliver antioxidants too.
You can slice them and eat them with dips or roast them and add them to dinner.
4. Cranberries
Cranberries help to prevent urinary tract infections. These usually stay in your bladder, they can travel up to your kidney, making kidney problems worse. Fortunately, regularly consuming cranberries can help you avoid this unwelcome situation.
Plus, cranberries have antioxidants that can help fight inflammation, and they can boost your heart and digestive health. It turns out, these tart berries aren't just for the Thanksgiving table.
5. Blueberries
We've talked about some of the best foods for kidneys, but you can take it a step further. The question is: What foods help repair kidneys? Blueberries deliver.
With high levels of antioxidants and loads of vitamin C and fiber, blueberries are all-around healthy. They can also help to reduce inflammation and support bone health, reversing some of the issues that can come with CKD.
6. Dark, leafy greens
There are plenty of reasons to turn to dark, leafy greens like spinach or kale. They deliver so many nutrients that they can help you get key vitamins and minerals, plus immunity-boosting benefits.
Be advised that greens can come with a decent amount of potassium. If you have CKD, talk to your doctor before adding more of these to your diet.
7. Olive oil
Rich in antioxidants and healthy fatty acids, olive oil can boost your overall wellness. A study from Harvard University found that olive oil may lower cholesterol levels and the risk of cardiovascular disease, dementia and some types of cancer.
Beyond all this, it can help you add flavor to dishes without turning to salt or butter. To get more antioxidants, choose unrefined or cold-pressed olive oil that's virgin or extra virgin.
8. Garlic
Another antioxidant-rich, inflammation-fighting food, garlic also contains a specific compound called allicin. For people with CKD, allicin — an active compound found in garlic — worked just as effectively to help protect kidney health as a prescription drug. If you're looking for the best foods for your kidneys, garlic has to make the list.
Plus, it's an excellent way to add flavor when you're skimping on salt.
9. Onions
From the same family as garlic, onions give you another excellent and salt-free way to add flavor (bonus points if you saute them in olive oil). Onions also deliver important nutrients like vitamins B6 and C, manganese and copper.
They also contain quercetin, a chemical that can help your body fight cancer, and organic sulfur compounds that can reduce your risk of high blood pressure, stroke and heart disease.
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10. Cauliflower
Cauliflower brings the crunch, paired with plenty of vitamins C, B6, B9 and K, along with fiber. It also contains compounds your body can use to neutralize certain toxins, a big help when your kidneys aren't doing their best filtration work.
Cauliflower does contain some potassium and phosphorus, though, so while it makes the list of foods good for kidneys, people with CKD may want to moderate their intake.
11. Egg whites
Egg whites are specifically recommended for people with kidney problems. They give you a way to increase your protein levels -- which can be important with later-stage CKD, especially if you're on dialysis.
12. Arugula
Arugula is packed with nutrients your body needs like magnesium, iron, calcium and vitamins A, B9, C and K. Plus, it's antioxidant-rich and has glucosinolates, which can help your body protect itself against a range of cancer types.
You can eat arugula raw (it's a great salad base), but you can also sprinkle it over whatever you're whipping up. It's great on pizzas, in omelets and with pasta, for example.
13. Apples
Apples deliver the cancer-fighting quercetin and fiber that can help to keep your cholesterol and blood sugar at healthy levels. They've got plenty of antioxidants.
Better yet, they're easy to work into your diet. Leave a bowl of apples on your counter and you'll have a kidney-healthy, grab-and-go snack whenever you need one.