The two most effective ways to avoid kidney failure are controlling blood sugar and managing blood pressure. Diabetes and high blood pressure cause more kidney failure than all other conditions combined, with about 1 in 3 people with diabetes and 1 in 5 with high blood pressure developing kidney disease. The good news is that kidney failure almost always develops gradually over years, which means there are multiple points where the right actions can slow or stop the damage.
Control Blood Sugar If You Have Diabetes
Diabetes damages the tiny blood vessels inside your kidneys that filter waste from your blood. Over time, high blood sugar thickens and scars these filters, letting protein leak into your urine and eventually reducing your kidneys’ ability to do their job. This process, called diabetic kidney disease, is the single leading cause of kidney failure in the United States.
The key metric is your A1C, a blood test that reflects your average blood sugar over the past two to three months. International kidney guidelines recommend keeping A1C somewhere between 6.5% and 8.0%, with the exact target depending on your age, how long you’ve had diabetes, and whether you already have some kidney damage. Tighter control (closer to 6.5%) offers more kidney protection but increases the risk of dangerously low blood sugar episodes, so work with your doctor to find the right balance. Consistent blood sugar management in the early years of diabetes has the biggest payoff for kidney preservation.
Keep Blood Pressure in Check
High blood pressure forces your kidneys to work harder by pushing blood through their delicate filtering units at excessive force. Over years, this damages the vessel walls and reduces the kidneys’ filtering capacity. Many people with high blood pressure have no symptoms at all, which is why it can silently erode kidney function for a decade before anyone notices.
For most adults, a target below 130/80 mmHg provides meaningful kidney protection. Reaching that number often involves a combination of medication and lifestyle changes: reducing sodium intake, staying physically active, maintaining a healthy weight, and limiting alcohol. If you already have early kidney disease, your doctor may prescribe a specific class of blood pressure medication that protects kidney tissue beyond just lowering the number on the cuff.
Watch Your Sodium and Protein Intake
Sodium makes your body retain water, which raises blood pressure and forces your kidneys to work harder. Most Americans consume well over 3,000 mg of sodium per day. If you have any stage of chronic kidney disease, guidelines recommend staying below 1,500 mg daily. Even without kidney problems, cutting back on sodium reduces strain on the kidneys and helps blood pressure medications work more effectively.
Most excess sodium comes from processed and restaurant foods, not the salt shaker on your table. Canned soups, deli meats, frozen meals, condiments, and fast food are the biggest culprits. Reading nutrition labels and cooking more meals at home are the two most practical changes you can make. As for protein, eating extremely high amounts (common with some fitness diets) increases the workload on your kidneys. If you’re at risk for kidney disease, a moderate protein intake is safer than loading up on protein shakes and large portions of meat at every meal.
Stay Hydrated, but Don’t Overdo It
Several large studies from Canada, Australia, and the United States have found that people who drink more water tend to have slower declines in kidney function over time. The mechanism makes sense: adequate hydration helps your kidneys flush waste efficiently and may reduce the concentration of substances that can cause damage. Guidelines for kidney stone prevention, which overlaps with general kidney health, recommend drinking enough to produce at least 2.0 to 2.5 liters of urine per day.
That said, the evidence comes mostly from observational studies, so it’s not yet proven that forcing extra water intake directly prevents kidney disease. The practical takeaway: drink water regularly throughout the day, enough that your urine stays a pale yellow. Don’t aggressively “fluid load” by chugging large volumes, as this can dilute your blood sodium to dangerous levels. Plain water is the best choice over sugary drinks or excessive caffeine.
Be Careful With Pain Medications
Over-the-counter anti-inflammatory drugs like ibuprofen and naproxen reduce blood flow to the kidneys. Occasional short-term use at recommended doses is generally safe for people with healthy kidneys, but regular or high-dose use can cause acute kidney injury and accelerate chronic kidney disease. The National Kidney Foundation recommends using these medications at the lowest effective dose for the shortest time necessary.
If your kidney filtration rate (eGFR) is already below 60, you should avoid these drugs entirely unless specifically directed by your healthcare provider. Acetaminophen is typically a safer alternative for routine pain relief when kidney health is a concern, though it carries its own risks for the liver at high doses. If you rely on pain medication frequently, it’s worth having a conversation about which options are safest for your kidneys.
Get Screened Early and Often
Kidney disease is often called “silent” because most people feel completely normal through the early stages. By the time symptoms appear, like swelling, fatigue, or changes in urination, significant damage has already occurred. Two simple tests can catch problems years before symptoms develop.
The first is a blood test measuring your estimated glomerular filtration rate, or eGFR. This number tells you how well your kidneys are filtering. A normal eGFR is 90 or above. Below 60 indicates moderate kidney disease, and below 15 means kidney failure. The second test is a urine test measuring the albumin-to-creatinine ratio (UACR), which detects protein leaking into your urine. A result under 30 mg/g is normal. Between 30 and 300 indicates early kidney damage, and above 300 signals serious damage. Both tests are inexpensive, routine, and available at any standard lab visit.
If you have diabetes, high blood pressure, a family history of kidney disease, or you’re over 60, you should be getting both tests at least once a year. Catching kidney disease at stage 1 or 2 gives you the most time and the most options to prevent progression. Many people diagnosed early never progress to kidney failure at all.
Medications That Actively Protect Kidneys
A class of medications originally developed for diabetes has shown remarkable kidney-protective effects, even in people without diabetes. These drugs work by changing how the kidneys filter sugar and salt, which reduces pressure inside the kidney’s filtering units and slows the scarring process. Clinical trials have demonstrated benefits for people with chronic kidney disease from various causes, including certain inflammatory kidney conditions like IgA nephropathy.
If you’ve been diagnosed with early or moderate kidney disease, ask your provider whether one of these protective medications makes sense for you. The kidney benefits appear to be separate from blood sugar lowering, which is why they’re now prescribed to people who don’t have diabetes at all. Combined with blood pressure control and lifestyle changes, these medications represent one of the most significant advances in preventing kidney failure in the past two decades.
Lifestyle Habits That Add Up
Beyond the big-ticket items of blood sugar and blood pressure, several everyday habits compound over time to protect or harm your kidneys. Smoking narrows blood vessels throughout the body, including the ones feeding your kidneys, and accelerates the loss of kidney function in people who already have some damage. Quitting smoking slows that decline measurably.
Maintaining a healthy weight matters because obesity independently raises the risk of kidney disease, partly through increased blood pressure and inflammation, and partly through direct metabolic stress on kidney tissue. Regular physical activity, even 30 minutes of moderate exercise most days, improves blood pressure, blood sugar regulation, and vascular health, all of which benefit the kidneys. Limiting alcohol to moderate amounts (no more than one to two drinks per day) prevents the blood pressure spikes and dehydration that heavy drinking causes. None of these changes alone is dramatic, but together they create an environment where your kidneys can function well for decades longer.