If your kidney function has declined, the honest answer is that chronic kidney damage can’t be undone. But that doesn’t mean your numbers are locked in place. Some causes of reduced kidney function, like dehydration, infections, or medication reactions, are temporary and reversible once treated. And for people with chronic kidney disease, the right combination of diet, exercise, medication, and habit changes can slow or even stop further decline, keeping your kidneys working well enough to avoid dialysis for years or decades longer.
Why Some Kidney Damage Is Reversible and Some Isn’t
Your kidneys filter blood through tiny structures that, once scarred, don’t regenerate. That’s why chronic kidney disease is considered permanent. However, acute kidney injury from causes like severe dehydration, a drug reaction, or a urinary tract blockage can temporarily tank your numbers. Treating the underlying cause often brings kidney function back to normal or close to it.
The key distinction is whether the drop in function is recent and tied to a clear trigger, or whether it’s been progressing over months or years. If your doctor recently flagged a low eGFR (the blood test that estimates how well your kidneys filter), your first step is figuring out which category you fall into. A single low reading doesn’t necessarily mean permanent damage.
Know Your Numbers
Two lab tests give you the clearest picture of kidney health. The first is eGFR, which estimates how many milliliters of blood your kidneys filter per minute. A normal eGFR is above 90. Below 60 for three months or more signals chronic kidney disease. Below 15 is kidney failure. The stages in between matter because they determine how aggressive your treatment plan should be.
The second test measures how much protein (specifically albumin) is leaking into your urine. Healthy kidneys keep protein in the blood, so finding it in urine means the filters are damaged. A urine albumin-to-creatinine ratio below 30 mg/g is normal. Between 30 and 300 mg/g indicates early damage. Above 300 mg/g suggests more serious injury. Tracking both numbers over time tells you whether your kidneys are stable or getting worse, which is more useful than any single snapshot.
Manage Blood Pressure and Blood Sugar First
High blood pressure and diabetes cause the vast majority of chronic kidney disease. If either condition is driving your kidney decline, controlling it is the single most effective thing you can do. Uncontrolled blood pressure forces your kidneys to filter under excessive pressure, gradually destroying the tiny blood vessels inside them. High blood sugar does the same kind of slow damage from a different angle.
For many people, getting blood pressure consistently below target and keeping blood sugar in range can nearly halt further kidney decline. Your doctor may prescribe a class of blood pressure medication that specifically protects the kidneys by reducing the pressure inside those filtering units. A newer class of diabetes medication originally designed to lower blood sugar has also shown remarkable kidney-protective effects: it reduces blood pressure, lowers the filtering pressure inside the kidneys, decreases inflammation, and cuts the risk of kidney disease progression. These medications are now prescribed for kidney protection even in some people without diabetes.
Reduce Sodium Intake
Sodium directly raises blood pressure and forces your kidneys to work harder. The general recommendation is to stay under 2,300 mg per day. If you already have kidney disease or high blood pressure, aiming for 1,500 mg per day is more appropriate. For context, a single fast-food meal can easily contain 1,500 to 2,000 mg.
Reading labels is the most practical habit change you can make. Look for products with no more than 6 to 10 percent of the daily value for sodium per serving. Foods labeled “very low sodium” contain less than 35 mg per serving. Most of the sodium people consume comes from processed and restaurant food, not the salt shaker, so cooking at home more often makes a measurable difference.
Adjust Your Protein Intake
Protein creates waste products that your kidneys have to filter out. When kidney function is reduced, eating too much protein accelerates the workload on already-damaged filters. Current guidelines from the Academy of Nutrition and Dietetics recommend people with stage 3 to 5 kidney disease (who aren’t on dialysis) eat between 0.55 and 0.60 grams of protein per kilogram of body weight per day. For a 150-pound person, that works out to roughly 37 to 41 grams of protein daily, significantly less than what most people eat.
If you have diabetes along with kidney disease, the recommended range is slightly higher: 0.6 to 0.8 grams per kilogram per day. And if you’re on dialysis, the guidance flips entirely. Dialysis strips protein from your blood during treatment, so people on hemodialysis or peritoneal dialysis need 1.0 to 1.2 grams per kilogram per day to avoid malnutrition. This is one of the areas where working with a renal dietitian pays off, because the right amount of protein depends entirely on your stage and treatment.
Stay Hydrated, but Know When to Limit Fluids
The relationship between water and kidney health is more nuanced than “drink more water.” Adequate hydration does help in specific situations. If you’re prone to kidney stones, drinking enough water prevents stone-forming crystals from clumping together. Water helps flush bacteria during urinary tract infections and can protect your kidneys when you’re taking certain medications or undergoing imaging tests that use contrast dye.
But if you have advanced kidney disease or are on dialysis, your kidneys may produce little or no urine. In that case, extra water has nowhere to go and builds up in your body, causing swelling, high blood pressure, and strain on your heart. People in this situation typically need to limit fluids. There’s no universal “eight glasses a day” rule for kidney patients. Your fluid needs depend on how much urine you’re producing, your stage of kidney disease, and whether you’re retaining fluid.
Exercise Regularly
Physical activity improves blood pressure, blood sugar control, and cardiovascular health, all of which directly benefit your kidneys. Guidelines for people with kidney disease recommend exercising five times per week, combining aerobic activity, strengthening exercises, and flexibility work. Alternating muscle groups (upper body one day, lower body the next) helps build endurance without overloading any single area.
You don’t need to train intensely. Walking, swimming, cycling, and light resistance training all count. The goal is consistency rather than intensity. If you’ve been sedentary, starting with 10 to 15 minutes and gradually building up is a reasonable approach. People with kidney disease often deal with fatigue, so adjusting on low-energy days rather than skipping entirely tends to work better long-term.
Avoid Medications That Harm the Kidneys
Common over-the-counter pain relievers called NSAIDs, including ibuprofen (Advil, Motrin) and naproxen (Aleve), reduce blood flow to your kidneys. Occasional use at low doses may be fine for people with healthy kidneys, but high doses or long-term use can cause kidney damage even in otherwise healthy people. If you already have reduced kidney function, these drugs are particularly risky. Aspirin at doses above 325 mg per day carries similar concerns.
Oral sodium phosphate products, sometimes used as bowel prep before medical procedures, should also be avoided by people with kidney disease. Even some prescription medications need dose adjustments when kidney function is low, because your kidneys can’t clear them as efficiently. Whenever you start a new medication, including supplements and herbal products, make sure whoever prescribes it knows your current kidney function numbers.
What Realistic Improvement Looks Like
If your kidney decline is caused by something treatable, like a medication you can stop or a condition that can be managed, you may see your eGFR climb back up. For people with chronic kidney disease, a realistic and genuinely good outcome is stabilization: keeping your eGFR steady year after year instead of watching it drop. Some people do see modest improvements in their numbers after making significant lifestyle changes, especially if uncontrolled blood pressure or blood sugar was driving the damage.
The practical takeaway is that protecting the kidney function you still have is far more valuable than chasing a specific number. Every point of eGFR you preserve buys time. People who actively manage their blood pressure, adjust their diet, exercise consistently, and avoid kidney-toxic medications can maintain stable function for years, even with a diagnosis of chronic kidney disease.