Keeping your kidneys healthy comes down to a handful of everyday habits: staying hydrated, managing blood pressure and blood sugar, eating well, staying active, and being cautious with certain medications and supplements. What makes kidney health tricky is that damage usually builds silently. About 87% of adults with chronic kidney disease don’t know they have it, according to the CDC. That means prevention matters far more than waiting for symptoms.
Drink Enough Fluids Throughout the Day
Water helps your kidneys flush waste and maintain healthy urine levels, which lowers the risk of kidney stones and urinary tract infections. The general target for healthy adults is about 11.5 cups (2.7 liters) to 15.5 cups (3.7 liters) of total fluid per day, including water from food and other beverages. That range comes from the Mayo Clinic and covers most people, though your needs go up with exercise, hot weather, or illness.
You don’t need to obsess over exact ounces. A practical check: your urine should be pale yellow most of the time. Dark yellow or amber urine usually means you need more fluids. Consistently low fluid intake forces your kidneys to concentrate urine more aggressively, which raises the chance of mineral crystals forming into stones over time.
Keep Blood Pressure in Check
High blood pressure is one of the top two causes of kidney disease, alongside diabetes. When pressure stays elevated, it damages the small blood vessels inside your kidneys that filter waste. Over years, this steady strain can reduce your kidneys’ filtering ability without any obvious warning signs.
Updated clinical guidelines recommend a systolic blood pressure (the top number) below 120 mm Hg for people with kidney disease. Even if you don’t have kidney problems yet, keeping blood pressure in a healthy range protects those filters long term. The most effective ways to do that without medication are cutting sodium, exercising regularly, maintaining a healthy weight, and limiting alcohol. If you’re already on blood pressure medication, staying consistent with it is one of the most important things you can do for your kidneys.
Watch Your Sodium Intake
Sodium directly raises blood pressure, which in turn puts stress on kidney blood vessels. The NIDDK recommends aiming for less than 2,300 milligrams of sodium per day. For context, a single teaspoon of table salt contains about 2,300 mg, and most people consume well over that amount, largely from processed and restaurant foods rather than the salt shaker at home.
The biggest sodium sources tend to be bread, deli meats, canned soups, frozen meals, pizza, and sauces. Reading nutrition labels and cooking more meals at home are the most reliable ways to bring your intake down. Even modest reductions, like switching from canned vegetables to fresh or frozen, make a meaningful difference over time.
Manage Blood Sugar if You Have Diabetes
Persistently high blood sugar damages the kidneys through a process called hyperfiltration. When glucose levels stay elevated, blood vessels in the kidney’s filtering units dilate unevenly. The vessels feeding blood into the filters open wider than the ones draining blood out, which increases pressure inside the filters themselves. Over months and years, that extra pressure wears down the delicate filtering tissue and allows protein to leak into your urine, one of the earliest signs of kidney damage.
If you have type 1 or type 2 diabetes, annual kidney screening is recommended. This typically involves two simple tests: a blood test to estimate your kidney’s filtration rate (called eGFR) and a urine test that checks for protein leakage (called a UACR). Protein levels above 30 mg/g in urine signal early kidney damage, often before you feel anything at all. Catching this early gives you the best chance of slowing or stopping progression through tighter blood sugar and blood pressure control.
Stay Physically Active
Regular exercise benefits your kidneys in ways that go beyond weight management. Aerobic activity, things like walking, cycling, or swimming, has been shown to reduce systemic inflammation by lowering markers like C-reactive protein and fibrinogen. Chronic inflammation is one of the drivers of kidney damage, so bringing those levels down offers direct protection. In people who already have early-stage kidney disease, aerobic exercise has been shown to reduce protein leakage into the urine, a key indicator that kidney filters are being preserved.
Resistance training also helps. Studies in people with kidney disease have found that strength exercises reduce inflammation and can even improve filtration rate. You don’t need an extreme routine. Consistent moderate activity, roughly 150 minutes per week, delivers the protective effects. The combination of lower blood pressure, better blood sugar regulation, reduced inflammation, and healthier body weight makes exercise one of the most broadly effective kidney-protective habits available.
Be Careful With Pain Medications
Over-the-counter anti-inflammatory drugs like ibuprofen and naproxen can reduce blood flow to your kidneys. Your kidneys produce natural compounds called prostaglandins that keep their blood vessels open and maintain adequate blood flow. These pain medications block prostaglandin production, which can cause blood flow to drop. In a healthy person using them occasionally, this is rarely a problem. But frequent or long-term use raises the risk, especially if you’re also dehydrated, taking blood pressure medications (particularly diuretics), or are over 60.
People at highest risk include those who already have reduced kidney function, heart failure, liver disease, or low fluid volume. If you need regular pain relief, talk to your doctor about alternatives. Acetaminophen is generally easier on the kidneys, though it carries its own considerations for liver health. The key point: occasional use of anti-inflammatories is fine for most people, but habitual daily use deserves a conversation with a healthcare provider.
Be Skeptical of Herbal Supplements
Herbal supplements occupy a gray area because they’re not regulated the same way as medications, and some contain ingredients that can directly harm your kidneys. Aristolochic acid, found in certain traditional remedies, is a known kidney toxin that has been banned in many countries but still shows up in products sold online. Beyond intentional ingredients, supplements can also contain contaminants like lead, mercury, or arsenic that accumulate in kidney tissue over time.
Even supplements that are safe for people with normal kidney function can become dangerous if your kidneys aren’t filtering at full capacity. Compounds that leave the body through the kidneys can build to toxic levels when filtration is impaired. The National Kidney Foundation advises caution with any herbal product, especially if you haven’t had your kidney function tested recently. If you’re taking supplements, let your doctor know so they can factor that into any kidney screening.
Get Screened if You’re at Risk
Because kidney disease is almost always silent in its early stages, screening is the only way to catch it before significant damage occurs. The two core tests are straightforward: a blood draw to calculate your estimated filtration rate (eGFR) and a urine sample to measure protein leakage (UACR). Together, these give a clear picture of how well your kidneys are working and whether there’s early damage to the filters.
Annual screening is specifically recommended for people with diabetes, but anyone with high blood pressure, a family history of kidney disease, heart disease, or obesity should discuss testing with their doctor. If your results show changes, more frequent monitoring may be needed. The gap between reality and awareness is enormous: nearly 9 out of 10 people with kidney disease are walking around undiagnosed. A simple set of tests can close that gap and give you years of lead time to protect the kidney function you still have.