Yes, eGFR can sometimes be improved, depending on what caused it to drop in the first place. In some cases, a low reading isn’t even reflecting true kidney damage. The key distinction is whether your kidneys have sustained permanent structural harm or whether reversible factors like dehydration, uncontrolled blood sugar, high blood pressure, or excess weight are dragging the number down. Healthy adults naturally lose about 0.4 to 1.0 points of eGFR per year after age 30, so not every decline signals a problem, but losses faster than that deserve attention.
Why Your eGFR Might Be Falsely Low
Before assuming your kidneys are damaged, it’s worth knowing that eGFR is an estimate based on blood levels of creatinine, a waste product generated by your muscles. Anything that raises creatinine without actually harming your kidneys will make your eGFR look worse than it really is.
People with high muscle mass, including regular weightlifters and bodybuilders, often get falsely low eGFR readings because their muscles produce more creatinine. Creatine supplements compound the problem, since creatine converts directly into creatinine in the body. A high-protein diet (particularly at extreme levels of 300 grams or more per day) also raises creatinine. In these situations, a doctor can order a cystatin C blood test instead. Cystatin C is produced at a steady rate by all cells in the body and isn’t influenced by muscle mass or diet, making it a more accurate measure of true kidney function.
Certain medications, including some common antibiotics, can temporarily raise creatinine levels without affecting actual kidney filtration. If your eGFR dropped suddenly after starting a new medication or after an intense period of exercise, a retest a few weeks later may show a completely different number.
How Blood Sugar Control Protects Kidney Function
Diabetes is the leading cause of chronic kidney disease worldwide, and getting blood sugar under control is one of the most effective ways to stop eGFR from falling further. Sustained high blood sugar damages the tiny blood vessels inside the kidneys, gradually reducing their ability to filter waste. Clinical guidelines from the international kidney disease organization KDIGO recommend keeping HbA1c (a marker of average blood sugar over three months) in an individualized range between below 6.5% and below 8%, depending on your stage of kidney disease and other health factors. For people with early-stage CKD and an eGFR still above 90, the target is tighter: below 6.5%.
Tighter blood sugar control has been shown to reduce microvascular damage, which is the type of small-vessel injury that harms kidneys. In early diabetic kidney disease, when damage is still mostly functional rather than structural, bringing blood sugar into a healthy range can slow or even halt progression. The earlier you intervene, the more reversible the damage tends to be.
Medications That Stabilize or Improve eGFR
A class of diabetes drugs originally designed to lower blood sugar has turned out to be remarkably protective for kidneys, even in people without diabetes. These medications, called SGLT2 inhibitors, work by helping the kidneys excrete excess sugar through urine, but they also reduce pressure inside the kidney’s filtering units. In real-world data, patients starting SGLT2 inhibitors saw an initial eGFR dip of about 3 points in the first one to three months. This dip is expected and actually reflects reduced strain on the kidneys. By 12 months, eGFR returned to baseline levels. In patients who started with an eGFR between 60 and 90, values trended above baseline by 18 months.
Interestingly, patients who began treatment with an eGFR below 60 (indicating moderate kidney disease) did not experience the initial dip at all. Their eGFR held steady or slightly increased throughout the 18-month observation period.
Blood pressure medications that block the renin-angiotensin system, commonly known as ACE inhibitors and ARBs, are another cornerstone of kidney protection. These drugs lower the pressure inside the kidney’s filtering units, reducing ongoing damage. In studies of non-dialysis diabetic kidney disease, ARBs reduced the risk of kidney events by 18% compared with placebo. Like SGLT2 inhibitors, they may cause a small initial eGFR dip that reflects reduced kidney strain rather than worsening function.
Weight Loss and eGFR Recovery
Obesity puts extra demand on the kidneys. Excess body weight increases blood flow through the kidneys and raises filtration pressure, which over time leads to damage. Losing significant weight can meaningfully reverse this process.
In a study comparing obese patients who underwent bariatric surgery with those who did not, the surgery group saw an average eGFR increase of 4.4 points at 12 months. The non-surgery group, by contrast, experienced an average decline of 6.4 points over the same period. That’s a net swing of nearly 11 points. The biggest gains came in patients who already had moderate or high risk of chronic kidney disease: their eGFR jumped by about 10 points within just three months of surgery. These results suggest that for people whose kidney function has declined partly due to obesity, weight loss can produce real, measurable improvement.
How Diet Affects Kidney Filtration
What you eat plays a direct role in how fast your kidneys decline. The evidence consistently points toward plant-based protein being gentler on the kidneys than animal protein. In the Nurses’ Health Study, each additional 10-gram increase in daily animal protein intake was associated with an extra 1.2-point annual decline in eGFR among people who already had mild to moderate kidney disease. Plant protein, by contrast, was linked to slower decline: each 10-gram increase in plant protein intake reduced the annual eGFR drop by 0.12 points.
One study found that people following a lacto-ovo vegetarian diet (no meat or fish, but including eggs and dairy) had an eGFR averaging 4.2 points higher than those eating a Mediterranean diet that included meat and fish. When patients with CKD who were already on ACE inhibitors partially replaced animal protein with plant protein, their levels of albumin in the urine (a key marker of kidney damage) dropped by 10% to 20%.
Part of the benefit comes from reducing metabolic acid load. Animal protein generates more acid during digestion than plant foods. Research has shown that correcting this acid buildup, either through fruits and vegetables or oral supplements, reduces a specific type of kidney tissue injury in patients with kidney disease from high blood pressure. A large community study of nearly 16,000 adults found that people in the highest tier of healthy plant-based diet quality experienced slower annual eGFR decline than those in the lowest tier.
The Role of Blood Pressure
Uncontrolled high blood pressure is the second leading cause of kidney disease after diabetes, and it accelerates eGFR loss significantly. Studies of healthy adults without hypertension show a normal age-related decline of 0.37 to 1.07 points per year. When hypertension is present, that rate can increase to 3.6 points per year or more. Getting blood pressure under control doesn’t regenerate lost kidney tissue, but it can dramatically slow or stop the excess rate of decline, effectively “reversing” the accelerated trajectory back toward the normal aging curve.
What Reversal Realistically Looks Like
True regeneration of destroyed kidney tissue does not happen. Once filtering units (nephrons) are scarred and lost, they don’t grow back. But that doesn’t mean your eGFR number can’t go up. In practice, eGFR improvement happens through several mechanisms: removing the factor that was suppressing kidney function (like dehydration, an offending medication, or uncontrolled blood sugar), reducing the excess pressure and strain that was causing ongoing damage, or correcting a measurement artifact like high creatinine from muscle mass or supplements.
The earlier you catch a declining eGFR, the more room there is for meaningful recovery. Someone in stage 2 CKD (eGFR 60 to 89) who addresses obesity, blood sugar, blood pressure, and diet may see their number climb back into the normal range. Someone in stage 4 (eGFR 15 to 29) with years of structural damage has far less reversible ground to recover, though slowing further decline still makes a significant difference in delaying or avoiding dialysis.
The practical takeaway: a declining eGFR is not necessarily a one-way street. The combination of blood sugar and blood pressure control, weight management, shifting toward more plant-based protein, and appropriate medications has been shown to stabilize and in many cases improve kidney filtration numbers, particularly when intervention happens early.