You can support your kidney function through a combination of regular exercise, dietary changes, better sleep, and careful management of conditions like diabetes and high blood pressure. No single lifestyle change will dramatically reverse kidney decline, but together these strategies can slow the rate at which your kidneys lose filtering capacity and, in some cases, modestly improve it.
What “Kidney Function” Actually Means
Your kidneys filter waste from your blood at a measurable rate called the estimated glomerular filtration rate, or eGFR. A normal eGFR is above 90. When that number drops, it means your kidneys are clearing waste more slowly. The natural strategies below are aimed at keeping that number as stable as possible or nudging it upward.
Exercise Has the Strongest Effect
Of all lifestyle changes studied, aerobic exercise shows the most consistent benefit for kidney function. A meta-analysis of clinical trials in people with moderate to advanced kidney disease found that an average 35-week aerobic training program improved eGFR by about 2.16 points compared to standard care. That may sound modest, but kidney function typically declines by roughly 1 point per year even in healthy adults, so gaining back two points effectively turns back the clock.
Walking, cycling, and swimming all count. The key is consistency over weeks and months rather than intensity. One important detail: exercise builds muscle, and muscle produces creatinine, which is the waste product used to estimate kidney function. That means exercise can temporarily make your eGFR numbers look worse on a lab test even while your actual kidney health is improving. If you start an exercise program and see a slight dip in your eGFR, that’s worth discussing with your doctor before assuming things have worsened.
Eat a DASH-Style Diet
The DASH diet (Dietary Approaches to Stop Hypertension) emphasizes fruits, vegetables, whole grains, lean proteins, and low sodium. It was originally designed for blood pressure, but it turns out to be one of the most protective eating patterns for kidneys as well.
A study published in Kidney International followed people with moderate kidney disease and high blood pressure for nearly eight years. Those with the poorest adherence to a DASH-style diet were 1.7 to 2.2 times more likely to progress to kidney failure compared to those who followed it most closely. Among people who also had diabetes, the effect was even more dramatic: the lowest adherence group was 3.5 times more likely to reach kidney failure. Mediterranean-style eating patterns, which overlap heavily with DASH, have also been linked to better survival in people with kidney disease.
The practical version of this diet means building your plate around vegetables, fruits, beans, whole grains, and moderate amounts of fish or poultry while cutting back on processed foods, red meat, and added sugars.
Keep Sodium Under 2,400 mg Per Day
Excess sodium forces your kidneys to work harder and raises blood pressure, which damages the tiny blood vessels inside the kidneys over time. The National Kidney Foundation recommends that people with kidney disease who are not on dialysis stay below 2,400 mg of sodium per day. For context, the average American consumes over 3,400 mg daily, so most people need to cut their intake by about a third.
The biggest sources aren’t the salt shaker. They’re restaurant meals, processed meats, canned soups, bread, and packaged snacks. Reading nutrition labels and cooking more meals at home are the most effective ways to get sodium under control. If you also have high blood pressure or are Black, some guidelines recommend an even lower target of 1,500 mg per day.
Be Strategic About Protein
Protein generates waste products that your kidneys must filter. When kidney function is reduced, eating large amounts of protein can accelerate the decline. Guidelines vary, but the general principle is clear: most people with moderate to advanced kidney disease benefit from not overloading on protein.
The standard recommended intake for healthy adults is 0.8 grams of protein per kilogram of body weight per day. For a 150-pound person, that’s about 55 grams. International kidney guidelines suggest that people with advanced kidney disease (stages 4 and 5) stick to roughly this amount, while some guidelines recommend going as low as 0.55 to 0.6 grams per kilogram for stages 3 through 5. That lower range means about 37 to 41 grams per day for a 150-pound person, which requires deliberate planning.
This doesn’t mean avoiding protein entirely. It means being intentional: choosing smaller portions of high-quality protein sources like eggs, fish, or poultry rather than large steaks or protein shakes. If you have early-stage kidney disease, you likely don’t need to restrict protein yet, but it’s worth tracking roughly how much you eat.
Sleep 7 to 8 Hours Per Night
Sleep is an underappreciated factor in kidney health. A prospective study that followed over 4,200 women for 11 years found a clear, dose-dependent relationship between short sleep and kidney decline. Compared to those sleeping 7 to 8 hours, women sleeping 5 hours or fewer per night were 79% more likely to experience a rapid drop in kidney function (defined as a 30% or greater decline in eGFR). Even sleeping just 6 hours raised the risk by 31%.
The rate of annual kidney function loss told the same story: people sleeping 5 hours or fewer lost filtering capacity at 1.2 points per year, compared to 0.8 points per year for those getting 7 to 8 hours. Over a decade, that difference adds up to roughly 4 extra points of eGFR lost. Sleeping 9 or more hours showed no additional benefit over 7 to 8, so more isn’t necessarily better.
Manage Blood Sugar If You Have Diabetes
Diabetes is the leading cause of kidney disease worldwide. Chronically elevated blood sugar damages the kidneys’ filtering units, and controlling it is one of the most powerful things you can do to protect kidney function. International guidelines recommend an individualized HbA1c target (a measure of average blood sugar over three months) ranging from below 6.5% to below 8%, depending on how advanced your kidney disease is, your age, and your risk of low blood sugar episodes.
People with early kidney disease and fewer complicating health conditions are typically encouraged to aim for the tighter end of that range. The DASH-style diet described above is particularly effective here: the study found that people with both diabetes and poor diet adherence had 3.5 times the risk of kidney failure compared to those eating well.
Stay Hydrated, but Don’t Overdo It
The right amount of fluid depends on your stage of kidney disease. In early stages (1 and 2), the American Kidney Fund recommends drinking about 64 ounces, or eight glasses, of water per day. This helps your kidneys flush waste efficiently. In later stages (3 through 5), you may need to limit fluids because the kidneys can’t remove excess water as effectively. Your doctor can give you a specific target based on your lab results and urine output.
Plain water is the best choice. Sugary drinks contribute to weight gain and blood sugar spikes, both of which strain the kidneys. Moderate coffee and tea consumption is generally fine for most people with kidney disease, though you’ll want to watch any added sugar or cream.
Avoid Herbal Supplements That Harm Kidneys
Many herbal supplements marketed as “kidney cleansers” or “detoxes” can actually damage kidney tissue. The National Kidney Foundation has flagged several common herbs found in dietary supplements that are associated with kidney injury:
- Aloe (oral supplements): linked to protein in the urine and progressive kidney injury
- Wormwood: associated with kidney injury and muscle breakdown that further harms the kidneys
- Yohimbe: can trigger kidney injury
- Nettle, senna, and cascara: all linked to kidney damage or protein loss in the urine
The most dangerous example is aristolochic acid, found in some traditional herbal preparations, which causes rapid and often irreversible kidney scarring and has been linked to kidney cancer. Because supplements aren’t regulated the way medications are, ingredients aren’t always clearly listed. The safest approach is to avoid any herbal “kidney health” supplement unless your nephrologist has specifically reviewed it.
Control Blood Pressure
High blood pressure is the second leading cause of kidney disease after diabetes, and the two conditions frequently travel together. Many of the strategies above, particularly the DASH diet, sodium reduction, exercise, and weight management, directly lower blood pressure. Keeping your blood pressure consistently in a healthy range reduces the physical stress on the kidneys’ delicate filtering structures. If you’re already on blood pressure medication, these lifestyle changes can make your medication more effective and, in some cases, allow for lower doses over time.