Managing kidney disease effectively comes down to a combination of dietary changes, blood pressure control, blood sugar management if you have diabetes, safe medication use, and regular physical activity. The earlier you act on these factors, the more kidney function you can preserve. Even in later stages, the right approach can significantly slow progression and reduce symptoms.
Know Your Stage
Kidney disease is classified into five stages based on how well your kidneys filter blood, measured by a number called GFR (glomerular filtration rate). The stages, defined by the National Kidney Foundation, break down like this:
- Stage 1: GFR of 90 or above. Kidneys still filter normally, but there are signs of damage (such as protein in the urine).
- Stage 2: GFR of 60 to 89. Mildly decreased function.
- Stage 3a: GFR of 45 to 59. Mild to moderate loss.
- Stage 3b: GFR of 30 to 44. Moderate to severe loss.
- Stage 4: GFR of 15 to 29. Severe loss.
- Stage 5: GFR below 15. Kidney failure.
Your stage determines which dietary restrictions, medications, and lifestyle changes matter most. Strategies that help at every stage include controlling blood pressure, limiting sodium, and staying physically active. More aggressive restrictions on protein, potassium, phosphorus, and fluids typically become necessary in stages 3 through 5.
Limit Sodium to Protect Your Kidneys
Sodium directly affects blood pressure and fluid retention, both of which accelerate kidney damage. National Kidney Foundation guidelines recommend that people with kidney disease who are not on dialysis consume less than 2,400 milligrams of sodium per day. If you’re on hemodialysis, the target drops to 2,000 milligrams or less.
For context, a single teaspoon of table salt contains about 2,300 milligrams of sodium, and most processed foods are loaded with it. The biggest sources tend to be canned soups, deli meats, frozen meals, condiments like soy sauce, and restaurant food. Reading nutrition labels and cooking at home with fresh ingredients are the two most effective ways to stay within your limit. Seasoning with herbs, citrus, and spices instead of salt makes the transition easier.
Adjust Protein Based on Your Stage
Protein creates waste products that your kidneys have to filter out. When kidney function is reduced, eating too much protein overworks the remaining tissue and speeds up damage. But eating too little can cause muscle loss, especially if you’re on dialysis. The balance shifts depending on where you are in the disease.
For stages 1 through 4, the recommendation is 0.8 to 1.0 grams of protein per kilogram of body weight per day. For someone who weighs 70 kilograms (about 154 pounds), that works out to roughly 56 to 70 grams daily. Some research suggests intake can be safely lowered to 0.6 grams per kilogram in people with significantly reduced kidney function, though this should be done with a dietitian’s guidance to prevent malnutrition.
Stage 5 flips this equation. People on dialysis actually need more protein, around 1.2 to 1.5 grams per kilogram per day, because dialysis removes protein from the blood along with waste. Lean sources like chicken, fish, and eggs are generally preferred because they produce less waste per gram of protein compared to red meat.
Watch Phosphorus and Potassium
Healthy kidneys keep phosphorus and potassium levels in check. As function declines, these minerals build up in your blood and cause real problems. Excess phosphorus pulls calcium from your bones, weakening them over time. High potassium can cause dangerous heart rhythm changes.
For phosphorus, the general target for people on dialysis is no more than 800 milligrams per day. Phosphorus hides in many processed foods as a preservative (look for ingredients with “phos” in the name), and it’s also naturally present in dairy, nuts, seeds, and dark sodas. Your doctor may prescribe medications called phosphorus binders, which you take with meals to block absorption. Starting these early, before dialysis, has been linked to better long-term outcomes.
For potassium, the foods most often restricted include bananas, oranges, potatoes, tomatoes, and many leafy greens. However, not everyone with kidney disease needs to limit potassium equally. Your blood levels determine whether and how strictly you need to cut back, so regular lab work matters.
Control Blood Pressure
High blood pressure is both a cause and a consequence of kidney disease, creating a cycle that accelerates damage. The 2024 KDIGO guidelines set the ideal blood pressure target for people with kidney disease at below 120/80 mmHg, with the top number (systolic) being the most important to get under 120.
That target is more aggressive than what many people expect. Reaching it typically requires a combination of sodium restriction, regular exercise, maintaining a healthy weight, and one or more blood pressure medications. If you’re older, prone to falls, or experience dizziness when standing, your target may be adjusted upward to avoid drops in blood pressure that could cause fainting.
Manage Diabetes Tightly
Diabetes is the leading cause of kidney disease worldwide, and poorly controlled blood sugar is the single biggest driver of kidney damage in people who have both conditions. The KDIGO guideline recommends an individualized HbA1c target, generally between 6.5% and 8.0%, for people with diabetes and kidney disease who are not on dialysis.
Where you fall in that range depends on your age, how long you’ve had diabetes, your risk of low blood sugar episodes, and how advanced your kidney disease is. Tighter control (closer to 6.5%) tends to offer more kidney protection but increases the risk of dangerous blood sugar drops, especially in later stages of kidney disease when the kidneys clear less insulin from the body. A newer class of medications originally developed for diabetes has shown striking benefits for kidney protection. These drugs work by reducing the pressure inside the kidney’s filtering units and lowering the organ’s energy demands, which protects it from the kind of chronic stress that drives scarring. In clinical trials, these medications reduced a key marker of kidney damage by 36% to 44%, and they appear to benefit people with kidney disease even without diabetes.
Be Careful With Pain Medications
Common over-the-counter painkillers like ibuprofen and naproxen reduce blood flow to the kidneys by blocking the production of protective compounds that keep the kidney’s filtering units open. This is especially dangerous when your kidneys are already compromised, when you’re dehydrated, or when you’re also taking blood pressure medications. The risk factors for kidney damage from these drugs include higher doses, longer use, existing kidney disease, and older age.
Acetaminophen (Tylenol) is generally considered the safer option for pain relief in kidney disease, though it should still be used at the lowest effective dose. Some concerns about its kidney effects have been raised over the years, but the evidence remains inconsistent.
Interestingly, research from the Chronic Renal Insufficiency Cohort study found that opioid painkillers posed a greater risk of kidney failure requiring dialysis and death than anti-inflammatory drugs, even after accounting for how sick patients were at the start. This doesn’t mean anti-inflammatory drugs are safe for kidneys. It means the alternatives aren’t always safer, and pain management in kidney disease requires careful, individualized planning.
Stay Physically Active
Exercise does more for kidney disease than most people realize. The National Kidney Foundation recommends 30 minutes of aerobic exercise on most days of the week. In a year-long study of 151 patients with stage 3 to 5 kidney disease, participants who exercised for 30 minutes a day, five days a week (combining endurance training with either strength or balance work) maintained or improved their physical function. A separate 12-week trial found that resistance training actually improved kidney filtration by a small but statistically meaningful amount compared to a control group that saw filtration decline.
You don’t need an intense routine. Walking, cycling, swimming, and light resistance exercises all count. Even home-based programs have shown clinical benefits for people on dialysis. The key is consistency over intensity.
Manage Fluids in Later Stages
In stages 1 and 2, most people don’t need to restrict fluids at all. Starting at stage 3, your doctor may begin monitoring your fluid balance more closely, and some restriction may become necessary depending on symptoms like swelling or shortness of breath.
Once you’re on dialysis, fluid limits become strict. The general recommendation is about 32 ounces (roughly one liter) per day. If you still produce urine, you can add the equivalent volume on top of that. So if you urinate 8 ounces in a day, your total allowance becomes 40 ounces. Ice chips, soups, popsicles, and fruits with high water content all count toward your fluid total, which catches many people off guard.