Kidneys that have lost some function can often be stabilized and, in early stages, partially recovered through changes in diet, blood pressure, blood sugar, and daily habits. True reversal depends on how much damage has already occurred. Scarred kidney tissue doesn’t regenerate, but the remaining healthy tissue can work more efficiently when you reduce the load on it. The strategies below target the major drivers of kidney decline and are backed by clinical evidence.
What “Restoring” Kidney Function Actually Means
Kidney function is measured by your estimated glomerular filtration rate, or eGFR, a number that reflects how well your kidneys filter waste from your blood. A normal eGFR is above 90. Once it drops below 60, you’re in moderate kidney disease territory, and below 15 is considered kidney failure.
If your kidneys have been damaged by years of high blood pressure or uncontrolled diabetes, the scarred portions won’t come back. But a meaningful amount of kidney decline is driven by ongoing, reversible stressors: inflammation, high blood sugar, excess sodium, and elevated blood pressure. Removing those stressors lets your remaining kidney tissue perform closer to its potential. People in early stages sometimes see their eGFR numbers climb back up. People in later stages can slow the decline dramatically, sometimes by years. Both outcomes matter.
Lower Your Blood Pressure to Protect Filtration
High blood pressure is both a cause and a consequence of kidney disease. It damages the tiny blood vessels inside the kidneys, which then lose their ability to filter properly. The 2024 KDIGO guidelines suggest that adults with kidney disease aim for a systolic blood pressure (the top number) below 120 mmHg if tolerated, with 130 mmHg as a practical target for most people. That’s tighter than the old standard of 140/90, reflecting strong evidence that lower pressure preserves more kidney function over time.
You can lower blood pressure without medication by cutting sodium, increasing potassium-rich foods (if your kidney function still supports it), losing excess weight, exercising regularly, and reducing alcohol. For many people, though, these changes work best alongside blood pressure medication rather than as a replacement for it. The goal is hitting the number consistently, however you get there.
Cut Sodium Below 1,500 mg Per Day
Sodium forces your kidneys to work harder by increasing the volume of fluid they need to filter. For people with kidney disease, the National Kidney Foundation recommends keeping intake to 1,500 mg per day. That’s less than a single teaspoon of table salt and far below what most people consume (the average American eats over 3,400 mg daily).
The biggest sources aren’t the salt shaker on your table. Bread, deli meats, canned soups, frozen meals, cheese, and restaurant food account for the bulk of sodium in most diets. Reading nutrition labels and cooking more meals at home are the two most effective strategies. Seasoning with herbs, citrus, vinegar, and spices can replace salt without making food bland.
Manage Blood Sugar If You Have Diabetes
Diabetes is the leading cause of kidney disease worldwide, and poorly controlled blood sugar accelerates kidney damage at every stage. Keeping your hemoglobin A1c below 7% has been shown to slow the progression from early kidney involvement to more advanced disease. A1c reflects your average blood sugar over about three months, so it captures the full picture rather than a single reading.
If your A1c is above 7%, bringing it down through diet, exercise, weight loss, or medication adjustments can meaningfully reduce the stress on your kidneys. Even small improvements matter. Dropping from 9% to 7.5% reduces the rate of kidney damage, even if you haven’t hit the ideal target yet.
Adjust Your Protein Intake
Protein metabolism produces waste products that your kidneys must filter out. When kidney function is reduced, a high-protein diet creates a backlog of these waste products and accelerates further damage. Current guidelines recommend 0.8 grams of protein per kilogram of body weight per day for people with kidney disease who aren’t on dialysis. For a 170-pound person, that works out to about 62 grams of protein daily.
This doesn’t mean avoiding protein entirely. It means being intentional about portions. A chicken breast has roughly 30 grams of protein, a cup of Greek yogurt has about 15, and an egg has 6. Tracking your intake for a few days can reveal whether you’re overshooting. People with diabetes and kidney disease may benefit from a range of 0.6 to 0.8 grams per kilogram, since both conditions affect how protein is processed.
Watch for Hidden Phosphorus in Processed Foods
Healthy kidneys remove excess phosphorus from your blood, but damaged kidneys can’t keep up. High phosphorus levels pull calcium from your bones, harden your blood vessels, and worsen kidney disease. The tricky part is that processed foods contain phosphorus-based additives that your body absorbs far more efficiently than the phosphorus naturally present in whole foods.
A recent analysis of the U.S. packaged food supply found that 21% of products contained more than one phosphorus additive, with some containing up to eight. The most common additives include lecithin, sodium phosphate, calcium phosphate, and sodium acid pyrophosphate. These don’t show up in the phosphorus totals on nutrition labels because labeling isn’t currently required. Your best defense is choosing whole, unprocessed foods over packaged ones whenever possible and scanning ingredient lists for anything containing “phosph” in the name.
Stay Hydrated, but Don’t Overdo It
Adequate hydration helps your kidneys flush waste without straining. Dehydration concentrates toxins and can cause acute drops in kidney function. But the advice to “drink more water” isn’t universally correct for kidney patients.
For people with early to moderate kidney disease, staying well hydrated is generally beneficial. A clinical trial studying people with moderate kidney disease used a practical hydration target: women under 150 pounds added about 4 cups of water per day to their usual intake, while men over 150 pounds added about 6 cups. These amounts were spread across meals rather than consumed all at once.
In advanced kidney disease, however, the kidneys lose the ability to excrete excess fluid, and drinking too much can cause dangerous swelling and fluid buildup around the heart and lungs. If your eGFR is below 30, or if you have heart failure, your fluid intake should be guided by your care team rather than general advice.
Exercise for Kidney Protection
Exercise doesn’t dramatically raise eGFR numbers in most studies, but it protects kidney function indirectly by improving blood pressure, blood sugar, weight, and cardiovascular health. Those are the same factors that drive kidney decline in the first place.
The research on exercise and kidney disease is mixed but generally encouraging. Several small trials found no direct change in eGFR after months of aerobic exercise, but one study of people with both kidney disease and cardiovascular disease found that 12 weeks of aerobic exercise and daily walking improved eGFR from 47 to 55. Another found that low-intensity aerobic exercise significantly lowered cystatin C, a sensitive marker of kidney filtration, even when eGFR didn’t change on standard tests.
The practical takeaway: aim for 30 minutes of moderate activity most days of the week. Walking, cycling, and swimming all qualify. The benefits to your blood pressure and blood sugar alone make this one of the highest-impact changes you can make.
Sleep 7 to 8 Hours Per Night
Sleep duration has a surprisingly strong connection to kidney health. A long-term study following over 4,200 people for 11 years found that sleeping five hours or less per night nearly doubled the odds of rapid kidney function decline compared to sleeping seven to eight hours. Even six hours carried a 31% higher risk. The kidney function of short sleepers declined at a rate of 1.2 points per year, compared to 0.8 points per year for those sleeping seven to eight hours. Over a decade, that difference adds up to several years’ worth of extra kidney aging.
The connection likely runs through blood pressure and hormonal regulation. Blood pressure naturally dips during deep sleep, giving the kidneys a nightly recovery period. Chronic short sleep eliminates that dip and keeps stress hormones elevated, both of which accelerate kidney damage.
Avoid Supplements That Harm Your Kidneys
Some herbal supplements marketed as “natural” kidney support are actively toxic to kidney tissue. The most dangerous is aristolochic acid, found in several plants used in traditional Chinese medicine. It causes rapidly progressive scarring of the kidneys and is classified as a known human carcinogen. The plants that contain it are sometimes mislabeled in herbal products. For example, “Fang Ji” on a label could refer to a harmless plant or to a species of Aristolochia, and “Mu Tong” has the same ambiguity.
Beyond aristolochic acid, high-dose creatine, excessive vitamin C (which converts to oxalate), and many weight-loss or bodybuilding supplements can stress the kidneys. If you have any degree of kidney disease, treat every supplement as potentially harmful until you’ve confirmed it’s safe. “Natural” and “herbal” are not synonyms for “kidney-safe.”
Putting It All Together
No single change restores kidney function on its own. The people who see the most improvement are those who address multiple risk factors at once: bringing blood pressure below 130 systolic, keeping A1c under 7% if diabetic, reducing sodium to 1,500 mg per day, moderating protein intake, staying active, sleeping seven to eight hours, and avoiding kidney-toxic substances. Each of these removes a source of ongoing damage and gives your kidneys the best chance to stabilize or recover. The earlier you start, the more function you have left to protect.