Whether you can improve your GFR depends on what caused it to drop. A GFR that fell suddenly from dehydration, medication, or an acute injury can often recover partially or fully within days to months. A GFR that has declined gradually over years from chronic kidney disease is harder to reverse, but the right changes can slow the decline significantly and, in some cases, stabilize your numbers for years.
GFR measures how efficiently your kidneys filter blood, expressed in milliliters per minute. A normal GFR is above 90. Between 60 and 89 signals mild loss. Below 60 is considered chronic kidney disease, and below 15 typically means dialysis or transplant territory. Knowing your stage helps you understand how aggressively to act.
Acute Drops vs. Chronic Decline
Not every low GFR reading means permanent kidney damage. Acute kidney injury, caused by severe dehydration, infection, blood loss, or a reaction to medication, can tank your GFR temporarily. Recovery from acute injury typically begins within the first 7 days. If kidney function remains impaired, recovery can still occur over the following 3 months. After 90 days of persistent dysfunction, the damage is reclassified as chronic.
If your GFR dropped suddenly, the most important step is identifying and removing the cause. That might mean stopping a problematic medication, treating an infection, or restoring fluid balance. Once the trigger is gone, your kidneys may bounce back on their own. Chronic decline is a different situation: the goal shifts from recovery to preservation.
Control Blood Pressure First
High blood pressure is the single most damaging force on kidneys with reduced function. It increases pressure inside the tiny filtering units of the kidney, accelerating their breakdown over time. Current guidelines for people with chronic kidney disease recommend targeting a systolic blood pressure of 120 mmHg or lower, which is stricter than the standard 140 mmHg target for the general population.
Hitting this target often requires medication, but lifestyle changes matter too. Reducing sodium is one of the most effective non-drug strategies. The National Kidney Foundation recommends no more than 2,400 milligrams of sodium per day for people with kidney disease who aren’t on dialysis, and no more than 2,000 milligrams for those on hemodialysis. For reference, a single fast-food meal can easily contain 1,500 to 2,000 milligrams. Reading labels and cooking at home gives you far more control.
Manage Blood Sugar if You Have Diabetes
Diabetes is the leading cause of kidney disease worldwide, and poorly controlled blood sugar directly damages the kidney’s filtering structures. The optimal HbA1c target for people with both diabetes and kidney disease is individualized, generally ranging from below 6.5% to below 8.0% depending on age, how advanced the kidney disease is, and the risk of dangerous blood sugar lows. Tighter control (closer to 6.5%) is appropriate for younger patients with early-stage disease, while a more relaxed target makes sense for older adults or those at risk of hypoglycemia.
A class of diabetes medications originally designed to lower blood sugar has turned out to be remarkably protective for kidneys, even in people without diabetes. These drugs work by changing how the kidneys handle glucose, and in the process they reduce the pressure inside the kidney’s filters. In a major trial, patients taking one of these medications lost only 1.85 mL/min of GFR per year compared to 4.6 mL/min per year on standard treatment alone. That difference could delay kidney failure by roughly 15 years. Your doctor may already have you on one of these if you have diabetes or significant kidney disease.
Adjust Your Protein Intake
Protein is essential, but your kidneys do the heavy lifting of processing its waste products. When kidney function is reduced, a high-protein diet forces the remaining healthy tissue to work harder, speeding up damage. Reducing protein intake to below 0.8 grams per kilogram of body weight per day (roughly 55 grams daily for a 150-pound person) has been linked to slower progression to kidney failure, lower levels of waste products in the blood, and better acid-base balance.
Very low-protein diets, below 0.4 grams per kilogram per day, show even greater preservation of kidney function in research, but these require careful supervision by a dietitian to prevent malnutrition. For most people, simply pulling back from the high-protein diets popular in fitness culture (often 1.2 to 2.0 grams per kilogram) to a more moderate range makes a measurable difference. Plant-based proteins may offer additional benefits because they produce fewer of the acidic waste products that stress the kidneys.
Lose Weight if You Carry Excess
Obesity forces the kidneys into a state called hyperfiltration, where they work above capacity to keep up with the metabolic demands of extra body mass. This sounds like a good thing on paper (your GFR may actually read as high or normal), but it’s deceptive. The overworked filtering units enlarge, then scar, and eventually fail. If hyperfiltration isn’t addressed, it can progress to irreversible scarring and kidney failure.
Weight loss, particularly through bariatric surgery in severe obesity, has been shown to reduce this hyperfiltration, lower protein leakage in the urine, and bring GFR to a more sustainable level. Even modest weight loss through diet and exercise helps reduce the metabolic burden on the kidneys. If your GFR is currently elevated above 120 to 130 and you carry significant extra weight, that number isn’t reassuring: it may indicate your kidneys are under strain.
Avoid Medications That Harm the Kidneys
Common over-the-counter painkillers like ibuprofen (Advil, Motrin) and naproxen (Aleve) are among the most frequent causes of preventable GFR decline. These drugs alter blood flow within the kidney’s filtering units, reducing filtration and causing inflammation in kidney tissue. Occasional use in someone with healthy kidneys is generally fine, but regular use with an already low GFR can push things significantly in the wrong direction.
Acetaminophen (Tylenol) is generally safer for the kidneys when used at recommended doses. If you take any regular medications, ask your pharmacist to flag anything that’s processed heavily by the kidneys or known to be directly toxic to kidney tissue.
Make Sure Your GFR Number Is Accurate
Before overhauling your life around a single lab result, it’s worth knowing that the standard GFR estimate (based on creatinine in your blood) can be misleading. Creatinine levels are influenced by muscle mass, diet, and hydration, which means a muscular person might get a falsely low reading, and someone with very little muscle mass might get a falsely reassuring one.
An alternative blood test using a protein called cystatin C provides a second estimate that isn’t affected by muscle mass. Research in older adults found that whichever of the two estimates comes back lower tends to be the more accurate one, with accuracy rates above 90% when the lower value is used. If your creatinine-based GFR seems inconsistent with how you feel or your overall health, asking for a cystatin C test can clarify the picture and prevent unnecessary worry or, conversely, catch a problem that the standard test missed.
Putting It All Together
The people who stabilize or slow their GFR decline most effectively tend to stack multiple strategies rather than relying on any single one. Controlling blood pressure to below 120 systolic, keeping sodium under 2,400 milligrams, moderating protein intake, maintaining a healthy weight, managing blood sugar if diabetic, and avoiding kidney-toxic medications all work on different pathways of kidney damage simultaneously. None of these changes is dramatic on its own, but combined they can shift the trajectory from steady decline to years of stability.
How quickly you see results depends on your starting point. If an acute cause triggered your GFR drop, improvements can show up within weeks. For chronic kidney disease, the goal is to see your GFR hold steady or decline more slowly on follow-up labs, typically rechecked every 3 to 6 months. A GFR that stops falling is a win, even if the number doesn’t climb back to where it was.