Most people with chronic kidney disease (CKD) can slow or even halt their progression toward dialysis, especially when they act early. Dialysis typically becomes necessary when kidney function drops below about 15% of normal, a measurement called GFR (glomerular filtration rate) that falls below 15 mL/min. But reaching that point is not inevitable. The combination of blood pressure control, blood sugar management, dietary changes, and newer medications can dramatically change the trajectory of kidney disease.
Know Where You Stand: CKD Stages and the Dialysis Threshold
Your GFR number tells you how much filtering capacity your kidneys still have. Healthy kidneys filter at 90 mL/min or above. Stage 3 CKD means your GFR has dropped to between 30 and 59, stage 4 falls between 15 and 29, and stage 5 is below 15, which is where dialysis enters the picture. Doctors generally begin preparing for dialysis when GFR drops below 20, which includes placing access lines and evaluating transplant eligibility.
The earlier your stage, the more room you have to intervene. Even at stage 4, meaningful changes can stabilize kidney function for years. The strategies below work best in combination, not in isolation.
Control Blood Pressure Aggressively
High blood pressure is both a cause and a consequence of kidney disease, creating a cycle that accelerates damage. The 2024 KDIGO guidelines recommend a target below 120/80 mmHg for most people with CKD. That’s lower than the general population target of 130/80, reflecting how much extra harm elevated pressure inflicts on damaged kidneys.
A class of blood pressure medications that blocks the renin-angiotensin system (commonly known as ACE inhibitors and ARBs) does double duty: it lowers blood pressure and independently reduces the amount of protein leaking into your urine, a key marker of ongoing kidney damage. A meta-analysis of 157 trials in people with diabetic kidney disease found the combination was superior to other blood pressure drugs at slowing progression to kidney failure. If you’re on one of these medications, staying consistent matters more than almost any other single intervention.
Manage Blood Sugar in the Right Range
Diabetes is the leading cause of kidney failure worldwide, and blood sugar control is one of the most powerful levers you have. But the target is more nuanced than “lower is better.” An observational study of over 6,100 patients with diabetes and CKD found that the lowest risk of death occurred with an HbA1c between 6% and 7%. Patients with HbA1c below 6% actually had outcomes similar to those above 9%, suggesting that overly tight control carries its own risks, including dangerous low blood sugar episodes.
The practical sweet spot for most people with kidney disease and diabetes is an HbA1c of roughly 6.5% to 7.5%. Your doctor can help you calibrate this based on your age, other conditions, and how advanced your kidney disease is.
Newer Medications That Protect the Kidneys
Two newer drug classes have transformed kidney care in the past decade, offering protection that goes beyond blood pressure and blood sugar control.
SGLT2 Inhibitors
Originally developed for diabetes, these medications reduce the workload on the kidneys by changing how the body handles glucose and salt. In people with advanced CKD and type 2 diabetes, SGLT2 inhibitors cut the risk of progressing to end-stage kidney disease by roughly 40%. That’s a striking benefit, and these drugs are now prescribed even for people with kidney disease who don’t have diabetes.
Nonsteroidal Mineralocorticoid Receptor Antagonists
Finerenone, the first drug in this class approved for kidney protection, targets inflammation and scarring in the kidneys. In a large trial published in the New England Journal of Medicine, finerenone reduced the combined risk of kidney failure, significant GFR decline, or death from kidney causes by 18% compared to placebo. When looking at the more severe outcomes alone (kidney failure or a GFR drop of more than 57%), the risk reduction reached 24%. These medications are currently indicated for people with CKD and type 2 diabetes, and they can be used alongside SGLT2 inhibitors and ACE inhibitors for layered protection.
Adjust Your Diet Before Problems Appear
Dietary changes become increasingly important as kidney function declines, but the specifics depend on your stage.
Protein: The general recommendation for people with a GFR below 30 (stages 4 and 5) is to keep protein intake around 0.6 to 0.8 grams per kilogram of body weight per day. For a 170-pound person, that translates to roughly 46 to 62 grams of protein daily. Eating too much protein forces the kidneys to work harder to filter waste products, accelerating decline. At earlier stages, a normal intake of 0.8 to 1.0 grams per kilogram is generally fine.
Sodium: The general limit is no more than 2,300 milligrams per day, but many people with CKD need to go lower. Sodium drives fluid retention and blood pressure, both of which stress damaged kidneys. The most impactful changes are cutting processed foods, canned soups, deli meats, and restaurant meals, which account for the vast majority of sodium in most diets.
Potassium and phosphorus: These minerals become harder for failing kidneys to regulate. Your doctor will monitor your blood levels and may ask you to limit high-potassium foods (bananas, potatoes, tomatoes, oranges) or high-phosphorus foods (dairy, dark colas, processed meats) if your levels run high. Not everyone with CKD needs these restrictions, so follow your lab results rather than applying blanket rules.
Stop Smoking
Smoking accelerates kidney function loss in a measurable, dose-dependent way. In a two-year study of people with primary kidney disease, six out of the continuing smokers required dialysis, compared to only one former smoker and zero nonsmokers. The decline in kidney filtering capacity was significantly faster in active smokers than in those who had quit. Quitting doesn’t reverse existing damage, but it can shift you from a steep decline curve to a much flatter one.
Avoid Kidney-Toxic Substances
Certain over-the-counter painkillers, particularly nonsteroidal anti-inflammatory drugs like ibuprofen and naproxen, can damage kidneys when used regularly. This risk multiplies when kidney function is already reduced. Acetaminophen (Tylenol) is generally considered safer for the kidneys but should still be used at the lowest effective dose. Some herbal supplements and high-dose vitamin C can also cause harm. If you have CKD, run any new supplement or medication past your nephrologist before starting it.
Recognize Warning Signs That Need Urgent Attention
Even with the best management, kidney function can sometimes decline suddenly. Certain symptoms signal that waste products are building up to dangerous levels, a condition called uremia. These include persistent nausea and vomiting, severe fatigue, confusion or memory problems, uncontrollable itching, muscle cramps, and loss of appetite. When these symptoms appear, dialysis may be needed regardless of your GFR number.
Dangerously high potassium is the most urgent complication, becoming a medical emergency when levels exceed 6.5 mEq/L. This can cause heart rhythm problems without much warning. Regular blood work, typically every one to three months depending on your stage, catches these shifts before they become emergencies. Keeping your lab appointments is one of the simplest and most effective things you can do to stay ahead of the disease.