Raising your eGFR usually means slowing or stopping the decline rather than reversing kidney damage that has already occurred, though meaningful recovery is possible when a reversible cause is involved. Kidney function naturally drops by roughly one point per year starting in your thirties, and chronic kidney disease (CKD) accelerates that loss. The good news is that a combination of dietary changes, regular physical activity, targeted medications, and managing conditions like high blood pressure and diabetes can meaningfully preserve the filtration capacity you still have. In some situations, these interventions can even push your eGFR back up.
Why “Increasing” eGFR Is More Complicated Than It Sounds
Your eGFR is an estimate of how well your kidneys filter waste, calculated from a blood test for creatinine or cystatin C. Because it is an estimate, the number can shift for reasons that have nothing to do with your actual kidney health. Creatinine, the marker most labs use, is a byproduct of muscle metabolism, so your muscle mass, diet, and hydration all influence the result.
People with lower muscle mass tend to produce less creatinine, which makes their eGFR look artificially high. People with higher muscle mass produce more creatinine, which can drag their eGFR reading down even when their kidneys are fine.1PubMed Central. Cystatin C and Muscle Mass in Patients With Heart Failure A separate study confirmed that lean tissue mass was significantly associated with inaccuracy in creatinine-based eGFR equations, while cystatin C-based formulas were not affected the same way.2Journal of the American Society of Nephrology. The Impact of Muscle Mass on eGFR Accuracy with Creatinine and Cystatin C This matters because if you start exercising and build muscle, your eGFR might appear to drop slightly even though your kidneys are healthier. Keep that in mind when tracking your numbers.
GFR also declines naturally with age, falling by about one point per year after your twenties. By age seventy, you may have lost more than 40 points from your peak.3Scientific Reports. Distribution of estimated glomerular filtration rate and determinants of its age dependent loss in a German population-based study That means an eGFR of 55 in a 75-year-old carries a very different meaning than the same number in a 35-year-old. Some researchers have argued for age-calibrated definitions of CKD precisely because the current universal threshold overestimates kidney disease in older adults and underestimates it in younger ones.4PubMed Central. An Age-Calibrated Definition of Chronic Kidney Disease: Rationale and Benefits
Dietary Protein and Plant-Based Eating
Protein intake is one of the most studied dietary levers for kidney function. When you eat a lot of protein, your kidneys work harder to clear the waste products, which raises the pressure inside the glomeruli (the tiny filtering units). Over time, that extra pressure can damage existing kidney tissue and accelerate CKD. A low-protein diet, generally around 0.6 to 0.8 grams per kilogram of body weight per day, is widely recommended to reduce that workload.5PubMed Central. How important is dietary management in chronic kidney disease progression? A role for low protein diets.
A long-term study from Brazil showed the difference starkly. Patients who stuck with a low-protein diet lost only about 0.3 points of eGFR per year, while those who did not lost about 1.4 points per year. That gap of roughly one point per year may not sound dramatic, but over a decade it means the difference between stable kidney function and significant progression.6Nephrology Dialysis Transplantation. Low-protein diet adherence and CKD progression during long-term follow-up
The source of the protein also matters. Plant-based diets are consistently linked to better kidney outcomes. A systematic review and meta-analysis found that adopting a plant-based diet was associated with about a 26% lower incidence of CKD, with a dose-dependent relationship: the more plant-based the diet, the slower the progression. Importantly, “unhealthy” plant-based diets heavy in refined grains and added sugars did not show the same benefit.7PubMed. Plant-Based Diet and Chronic Kidney Disease: A Systematic Review and Meta-Analysis Animal protein tends to create an acidic metabolic environment and promote inflammation and hyperfiltration, while plant protein appears to do the opposite.8PubMed Central. Ameliorating Chronic Kidney Disease Using a Whole Food Plant-Based Diet
For people with more advanced CKD, a very-low-protein vegetarian diet supplemented with keto-analogues (synthetic amino acid substitutes) may be even more effective. A randomized trial of 207 patients found that this approach significantly reduced the risk of halving initial eGFR or needing dialysis, compared with a standard low-protein diet.9PubMed Central. The Role of Plant-Based Diets in Preventing and Mitigating Chronic Kidney Disease: More Light than Shadows This is a strategy to discuss with a nephrologist and dietitian, not something to attempt on your own, since very-low-protein diets carry a risk of malnutrition if not carefully managed.
Sodium, Hydration, and Other Dietary Factors
Cutting back on salt helps your kidneys through a different pathway than protein restriction. A meta-analysis found that a low-salt diet reduced the risk of composite kidney outcomes (such as doubling of creatinine or need for dialysis) by about 28%.10PubMed Central. Effect of a low-salt diet on chronic kidney disease outcomes: a systematic review and meta-analysis In the context of diabetes specifically, animal research has shown that a low-sodium diet can correct the hyperfiltration that characterizes early diabetic kidney disease, by activating a hormonal pathway that rebalances blood flow through the kidneys.11PubMed. Sodium restriction corrects hyperfiltration of diabetes
There is an important nuance here. The DASH-Sodium trial found that combining the DASH diet (rich in fruits, vegetables, and low-fat dairy) with sodium restriction actually caused a small short-term decrease in eGFR, about 3 points.12PubMed Central. Effects of Reduced Dietary Sodium and the DASH Diet on GFR: The DASH-Sodium Trial That initial dip reflects reduced pressure inside the kidney’s filtering units, not actual kidney damage. It mirrors the pattern seen with several kidney-protective medications. Think of it as the kidney stepping off the accelerator: lower pressure in the short term, but less wear and tear over the years.
Staying well hydrated also plays a role, though the relationship is not straightforward. Chronic mild dehydration has been linked to glomerular hyperfiltration in research examining urine concentration markers, suggesting that habitually under-drinking may push the kidneys to filter harder than they should.13PubMed Central. Sub-morbid dehydration-associated glomerular hyperfiltration: An emerging reality? On the flip side, extreme dehydration during prolonged exercise can temporarily lower eGFR and trigger markers of kidney injury.14PubMed Central. Impact of acute versus prolonged exercise and dehydration on kidney function and injury The practical takeaway is to drink steadily throughout the day without forcing excessive amounts. For most people with CKD, aiming for pale yellow urine is a reasonable guide, though your doctor may give you specific fluid targets if your disease is advanced.
Fiber and the Gut-Kidney Connection
This is an area of research that has gained traction in recent years. When your kidneys are not filtering well, waste products called uremic toxins accumulate in the blood. Many of these toxins are actually produced by gut bacteria. Dietary fiber shifts the composition of gut bacteria toward species that produce fewer uremic toxins and more short-chain fatty acids, which have anti-inflammatory effects.15PubMed Central. The Role of Dietary Fiber and Gut Microbiome Modulation in Progression of Chronic Kidney Disease Fiber also helps move uremic toxins out through the stool and strengthens the intestinal barrier so that fewer toxins leak into the bloodstream in the first place.16Clinical Kidney Journal. Fiber intake and health in people with chronic kidney disease
This is part of why plant-based diets show such consistent benefits for CKD: they are inherently higher in fiber. Fruits, vegetables, legumes, and whole grains all feed those beneficial bacterial communities. If you have CKD, talk to your care team about how to increase fiber without overloading on potassium and phosphorus, which can be concerns in later stages of kidney disease.
Exercise and Physical Activity
Exercise clearly helps with the risk factors that drive kidney disease: it lowers blood pressure, improves blood sugar control, and reduces body weight. But the direct evidence for exercise raising eGFR itself is more modest than you might hope. A meta-analysis of non-dialysis CKD patients found that exercise therapy increased eGFR by about 2.6 points on average, alongside meaningful reductions in blood pressure and BMI.17PubMed Central. Exercise therapy improves eGFR, and reduces blood pressure and BMI in non-dialysis CKD patients: evidence from a meta-analysis
The catch is that these gains seem to fade in longer studies. A review of the exercise literature noted that the eGFR improvements were only seen in studies lasting less than three months. In studies lasting three to twelve months, eGFR did not differ between exercisers and controls. The largest randomized trial, following 72 patients for a year, found no change in eGFR in either the exercise group or the control group.18PubMed Central. Exercise training in chronic kidney disease—effects, expectations and adherence That does not mean exercise is pointless for kidney health. It means its kidney benefits likely come indirectly, through controlling blood pressure, weight, and metabolic health, rather than through a direct effect on the nephrons themselves. Exercise also builds muscle mass, which can paradoxically push your creatinine-based eGFR reading down slightly, masking the indirect benefit.
One thing to be aware of: a hard workout temporarily raises creatinine levels, which can cause a misleadingly low eGFR on a blood test drawn shortly after exercise.19American Journal of Clinical Pathology. Exercise-induced Changes in Common Laboratory Tests If you are tracking your eGFR, avoid intense exercise in the 24 to 48 hours before a blood draw.
Medications That Protect Kidney Function
Several classes of medication have strong evidence for slowing or stabilizing eGFR decline, and some can even reverse the trajectory in patients whose kidneys are worsening.
ACE Inhibitors and ARBs
These blood pressure medications have been the backbone of CKD treatment for decades. They work by reducing the pressure inside the glomeruli, which slows ongoing damage from hyperfiltration. A systematic review of randomized trials confirmed that blocking the renin-angiotensin system reduces protein leaking into the urine (a key marker of kidney injury) and mitigates ongoing renal damage.20PubMed Central. ACE Inhibitors and ARBs in Chronic Kidney Disease: A Systematic Review of Randomized Controlled Trials on Albuminuria Reduction, eGFR Decline, and Safety Like the dietary sodium reduction discussed earlier, ACE inhibitors and ARBs typically cause a small initial dip in eGFR that reflects reduced glomerular pressure, not kidney damage. If the drop is modest, it usually signals that the medication is doing its job.
SGLT2 Inhibitors
Originally developed for diabetes, SGLT2 inhibitors (such as dapagliflozin and empagliflozin) have become a major addition to CKD treatment regardless of whether the patient has diabetes. They also cause an initial eGFR dip, typically a few points, followed by a stabilization of kidney function that outperforms placebo over the long run.21PubMed Central. Clinical Implications of an Acute Dip in eGFR after SGLT2 Inhibitor Initiation The mechanism is similar in concept to ACE inhibitors: they reduce intraglomerular pressure by changing how the kidney handles sodium and glucose. If your doctor starts you on one of these medications and your eGFR drops slightly in the first few weeks, that is usually expected and not a reason to stop.
Finerenone
Finerenone is a newer medication that blocks the mineralocorticoid receptor, reducing inflammation and scarring in the kidneys. In a real-world study of patients with diabetic kidney disease, the average eGFR slope improved dramatically after starting finerenone, going from a loss of about 7.3 points per year to essentially flat at −0.5 points per year.22PubMed Central. Real-world use of finerenone in diabetic kidney disease: eGFR slope analysis with exploratory data on prior MRA use A separate prospective study found that finerenone improved eGFR and reduced protein in the urine over one year, including in patients with CKD stages 3 and 4 and even those without diabetes.23PubMed Central. Efficacy and safety of finerenone in chronic kidney disease stages 3-4 in diabetic and non-diabetic patients with an eGFR 20-60 mL/min: a prospective cohort study
GLP-1 Receptor Agonists and Weight Loss
Semaglutide and similar drugs are increasingly studied for kidney protection in people with obesity-related CKD. Modeling research suggests that the kidney benefits of GLP-1 receptor agonists come largely from the weight loss they produce rather than a direct effect on the kidneys themselves. When the appetite-suppression and weight-loss effects were removed from a mathematical model, most of the reductions in blood pressure and GFR (hyperfiltration) disappeared.24Physiology. Modeling the role of semaglutide treatment in patients with obesity and kidney disease That still makes them valuable: if excess weight is driving your kidney decline, losing it through any effective means protects the kidneys. GLP-1 drugs just happen to be unusually effective at producing sustained weight loss.
Stopping Medications That Hurt Your Kidneys
Sometimes the quickest way to see your eGFR go up is to stop taking something that has been dragging it down. Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and naproxen are among the most common culprits. In one study, twelve months of regular NSAID use dropped the median eGFR from 84 to about 73.25PubMed Central. Impact of Non-steroidal Anti-inflammatory Drug Administration for 12 Months on Renal Function When patients with established CKD stopped taking NSAIDs, their eGFR recovered. In stage 4 patients, for example, eGFR rose from about 24 to 27, and in stage 5 patients the rebound was even more pronounced.26PubMed Central. Estimated GFR reporting is associated with decreased nonsteroidal anti-inflammatory drug prescribing and increased renal function
If you have CKD and are taking NSAIDs regularly for pain or inflammation, ask your doctor about alternatives. Acetaminophen is generally considered safer for the kidneys at appropriate doses. Other pain management strategies, physical therapy, or different classes of medication may also be options. A similar caution applies to certain herbal supplements, high-dose vitamin C, and other over-the-counter products that can stress the kidneys, though the evidence is less systematic for those.
Creatine Supplements and the eGFR Confusion
This trips up a lot of people, especially those who exercise regularly. Creatine supplements are widely used for muscle performance, and because creatine breaks down into creatinine, taking it can raise your creatinine blood level and make your eGFR reading look worse. A recent meta-analysis found that creatine supplementation produced a small, statistically significant increase in serum creatinine, but the effect was only significant in the first week of use and disappeared with longer follow-up. Crucially, there was no significant difference in actual GFR between people taking creatine and those taking a placebo.27PubMed Central. Effect of creatine supplementation on kidney function: a systematic review and meta-analysis In other words, creatine makes the test look bad without actually hurting the kidneys. If you use creatine and your eGFR seems low, mention it to your doctor. A cystatin C-based eGFR test can give a reading unaffected by creatine intake.
Controlling Blood Pressure and Blood Sugar
High blood pressure and diabetes are the two leading causes of CKD worldwide, so managing them is not just helpful but essential. A study of patients with type 2 diabetes found that poor glucose and blood pressure control was significantly associated with both clinical protein in the urine and severe eGFR decline.28PubMed Central. Effects of glucose and blood pressure control on diabetic kidney disease in old patients with type 2 diabetes
Blood pressure control is its own balancing act, though. Trials comparing intensive blood pressure targets (below 120 systolic) to standard targets (below 140 systolic) have shown that aggressive lowering can produce an acute eGFR drop, similar to starting ACE inhibitors or SGLT2 inhibitors. In the ACCORD-BP trial, eGFR was about 11% lower in the intensive-treatment arm after two years, yet markers of actual kidney injury did not differ between groups, suggesting the drop was hemodynamic rather than structural.29PubMed Central. Intensive BP Control and eGFR Declines: Are These Events Due to Hemodynamic Effects and Are Changes Reversible? Your nephrologist can help determine whether a dip in your eGFR after starting or intensifying blood pressure treatment is a sign of protection or a cause for concern.
Sodium Bicarbonate for Metabolic Acidosis
As CKD progresses, the kidneys become less able to excrete acid, leading to a condition called metabolic acidosis. Acidosis itself accelerates kidney damage, creating a vicious cycle. Oral sodium bicarbonate (essentially baking soda in pill form) can correct the acid buildup, and a meta-analysis found it slowed eGFR decline by about 4.4 points compared with control groups.30PubMed Central. The Effects of Oral Sodium Bicarbonate on Renal Function and Cardiovascular Risk in Patients with Chronic Kidney Disease: A Systematic Review and Meta-Analysis
The evidence is not perfectly consistent, however. A multicenter randomized trial of bicarbonate in stage 3 and 4 CKD found no significant difference in eGFR between the treatment and placebo groups.31PubMed Central. Effects of Sodium Bicarbonate in CKD Stages 3 and 4: A Randomized, Placebo-Controlled, Multicenter Clinical Trial The discrepancy may reflect differences in how acidotic the patients were at baseline: bicarbonate likely helps most in people who are genuinely acidotic. This is something to have your doctor check with a simple blood test for serum bicarbonate levels. Self-treating with baking soda is not advisable because the sodium load can raise blood pressure and cause fluid retention.
Sleep Apnea and Kidney Function
Obstructive sleep apnea (OSA) is an underrecognized contributor to kidney decline. The repeated drops in oxygen during sleep cause spikes in blood pressure, sympathetic nervous system activation, and oxidative stress that all damage the kidneys over time.32PubMed Central. Obstructive Sleep Apnea and Kidney Disease: A Potential Bidirectional Relationship? The relationship goes both ways: lower eGFR is also associated with higher odds of having OSA. One study found that every 10-point drop in eGFR was associated with a 42% increase in the odds of sleep apnea.33PubMed Central. High prevalence of obstructive sleep apnea and its association with renal function among nondialysis chronic kidney disease patients in Japan: a cross-sectional study
Treating OSA with continuous positive airway pressure (CPAP) may help break this cycle. Research on patients treated with CPAP showed that while GFR itself did not change significantly, renal blood flow increased and the filtration fraction dropped, indicating a reduction in the harmful hyperfiltration pattern.34PubMed Central. The Impact of Obstructive Sleep Apnea on Chronic Kidney Disease If you snore heavily, wake up tired despite sleeping enough hours, or have been told you stop breathing at night, getting screened for sleep apnea could be one of the more impactful things you do for your kidneys.
Putting It Together Without Expecting Miracles
No single intervention is likely to produce a dramatic jump in your eGFR. What the evidence consistently shows is that stacking several modest strategies together can flatten or even slightly reverse the downward curve. A low-protein plant-based diet, sodium restriction, regular moderate exercise, appropriate medications like ACE inhibitors or SGLT2 inhibitors, treating sleep apnea, stopping nephrotoxic painkillers, and managing blood pressure and blood sugar each contribute a few points of preserved filtration. Over years, those points compound. The patients who do best in long-term studies are generally those who make multiple changes simultaneously under medical guidance, not those who pin their hopes on a single supplement or drug.
One final practical note: when tracking your eGFR, pay more attention to the trend over months and years than to any single reading. A number that bounces from 52 to 48 to 54 over three tests is probably stable. The slope of the line matters far more than where any one dot falls. If your trend is flat or gradually improving, your current approach is working, even if the number has not crossed some threshold you were hoping for.