Controlling kidney disease centers on a handful of strategies that work together: keeping blood pressure and blood sugar in tight ranges, adjusting your diet, staying physically active, and avoiding substances that stress the kidneys further. None of these steps alone is enough, but combined they can slow or even stall the loss of kidney function for years.
Know Your Starting Point
Kidney function is measured by a blood test called eGFR, which estimates how well your kidneys filter waste each minute. The stages break down like this:
- Stage 1: eGFR 90 or above (normal filtering, but other signs of damage like protein in urine)
- Stage 2: eGFR 60 to 89 (mild loss)
- Stage 3a: eGFR 45 to 59 (mild to moderate loss)
- Stage 3b: eGFR 30 to 44 (moderate to severe loss)
- Stage 4: eGFR 15 to 29 (severe loss)
- Stage 5: eGFR below 15 (kidney failure)
Your stage determines how aggressive your management plan needs to be and which dietary changes apply. Most people are diagnosed somewhere in stages 2 through 3, where the greatest window for slowing progression exists.
Blood Pressure: The Single Biggest Lever
High blood pressure damages the tiny blood vessels inside the kidneys, accelerating the loss of filtering capacity. International guidelines from KDIGO now recommend keeping systolic blood pressure (the top number) below 120 mmHg for most people with kidney disease. That target is tighter than the general-population goal of under 130, and it comes from the SPRINT trial, which showed meaningful kidney and heart benefits at the lower number.
A class of blood pressure medications that block the renin-angiotensin system is considered first-line for kidney protection. These drugs do more than lower pressure. They reduce the amount of protein leaking into urine, a key marker of ongoing kidney damage. The 2024 KDIGO guidelines continue to recommend these medications for both blood pressure control and proteinuria management. If you’re already on one of these medications, stopping it without guidance can cause a rebound in kidney stress, so dosing changes should always happen in coordination with your care team.
Blood Sugar Control if You Have Diabetes
Diabetes is the leading cause of kidney disease worldwide, and chronically elevated blood sugar directly injures the filtering units of the kidney. The target HbA1c, which reflects your average blood sugar over roughly three months, is individualized: anywhere from below 6.5% to below 8%, depending on your age, how advanced the kidney disease is, and your risk of dangerous blood sugar drops. Tighter control (closer to 6.5%) generally offers better protection against further kidney damage, but the risk of low blood sugar episodes increases, especially in later stages of kidney disease when the kidneys clear insulin more slowly.
A newer class of diabetes medication originally designed to lower blood sugar has turned out to be one of the most important tools for kidney protection. These drugs reduce the risk of kidney failure by 30% to 40% over two to three years, and they work whether or not you have diabetes. The 2024 guidelines now recommend them for anyone with kidney disease and significant protein in the urine. Another class of injectable diabetes medications, GLP-1 receptor agonists, also shows kidney-protective effects and is now recognized in the latest guidelines for people with type 2 diabetes and CKD. A newer non-steroidal mineralocorticoid receptor antagonist called finerenone has also been added to the toolkit for patients with type 2 diabetes and kidney disease, offering additional protection on top of existing therapies.
Adjusting What You Eat
Protein
Damaged kidneys struggle to handle the waste products created when your body processes protein. For stages 3 through 5 (before dialysis), the general guideline is 0.6 to 0.75 grams of protein per kilogram of body weight per day. For a 170-pound person, that works out to roughly 46 to 58 grams daily, which is noticeably less than the average American diet. About half should come from high-quality sources like eggs, fish, or poultry, which produce less waste per gram than plant proteins. This is one area where precision matters: too little protein leads to muscle wasting, so working with a dietitian is genuinely useful here.
Sodium
Excess sodium raises blood pressure and causes fluid retention, both of which strain the kidneys. Most kidney disease guidelines recommend staying under 2,000 mg of sodium per day. The biggest sources aren’t the salt shaker but packaged foods, restaurant meals, deli meats, and canned soups. Reading nutrition labels for sodium content is the most practical single step you can take.
Potassium and Phosphorus
As kidney function declines, the kidneys lose the ability to clear potassium and phosphorus efficiently. Buildup of potassium can cause dangerous heart rhythm problems, while excess phosphorus pulls calcium from bones and damages blood vessels. Whether you need to restrict these depends on your stage and your blood levels. Not everyone with kidney disease needs to cut potassium-rich foods like bananas and potatoes, but if your labs show levels creeping up, your doctor or dietitian will set specific limits. Phosphorus is trickier because it hides in food additives (look for ingredients with “phos” in the name on packaged food labels), and the body absorbs additive-based phosphorus much more readily than the kind naturally found in whole foods.
Exercise and Physical Activity
Regular exercise improves blood pressure, blood sugar, and cardiovascular health, all of which directly protect the kidneys. The American College of Sports Medicine recommends that people with kidney disease aim for 20 to 60 minutes of mild-to-moderate aerobic exercise (walking, cycling, swimming) three to five days a week. On top of that, resistance training two to three days a week helps preserve muscle mass, which is especially important because kidney disease and the lower-protein diet can both contribute to muscle loss over time.
You don’t need to start at the high end of those ranges. Even consistent 20-minute walks most days of the week offer measurable benefit. The key is regularity rather than intensity.
Medications and Substances to Avoid
Certain common, easily available drugs are directly toxic to the kidneys. NSAIDs like ibuprofen and naproxen are the biggest offenders. They reduce blood flow to the kidneys and can trigger acute kidney injury, especially in people whose function is already compromised. Even occasional use adds risk. Acetaminophen (Tylenol) is generally safer for pain but still carries some kidney risk with long-term, high-dose use.
High-dose aspirin and certain prescription drugs, including some antibiotics, cancer therapies, and immune-suppressing medications, can also cause kidney damage. The 2024 KDIGO guidelines put a strong emphasis on what they call “nephrotoxin stewardship,” meaning actively reviewing every medication you take for kidney safety. One practical step: during any illness involving vomiting, diarrhea, or dehydration, temporarily stopping certain medications (your doctor can tell you which ones) prevents an acute drop in kidney function. This “sick day” plan is something worth setting up in advance so you know exactly what to do.
Tracking Progress Over Time
Kidney disease management isn’t set-and-forget. Your eGFR and urine protein levels should be checked regularly, with frequency depending on your stage. Stable stage 2 might only need annual monitoring, while stage 4 typically requires checks every one to three months. A declining eGFR signals the need to tighten one or more of the strategies above, while stable or even slightly improving numbers confirm the plan is working.
Two numbers matter most at each check-in: your eGFR (tracking overall function) and your urine albumin-to-creatinine ratio (tracking how much protein is leaking through damaged filters). A drop in protein leakage is one of the earliest and most reliable signs that treatment is slowing the disease. If your care team isn’t routinely sharing both of these numbers with you, ask for them.