Keeping your kidneys healthy comes down to a handful of daily habits: staying hydrated, managing blood pressure and blood sugar, eating moderate amounts of sodium and protein, maintaining a healthy weight, and being cautious with certain medications and supplements. Most kidney damage happens gradually and silently, so the best strategy is prevention through lifestyle choices you can start today.
Stay Hydrated, but Don’t Overthink It
Your kidneys need adequate fluid to filter waste from your blood efficiently. The general guideline for healthy adults is about 11.5 cups (2.7 liters) for women and 15.5 cups (3.7 liters) for men of total fluid per day. That includes all beverages and the water in food, which accounts for roughly 20% of your daily intake. So you don’t need to drink that entire amount as plain water.
Thirst is a reliable guide for most people. Your urine color offers an even better signal: pale yellow means you’re well hydrated, while dark amber suggests you need more fluids. During hot weather, exercise, or illness (especially with vomiting or diarrhea), your needs increase. Chronic mild dehydration forces your kidneys to concentrate urine more aggressively, which over time can contribute to kidney stone formation.
Keep Sodium Under 2,300 mg Per Day
Excess sodium raises blood pressure, and high blood pressure is one of the two leading causes of kidney disease. The National Kidney Foundation recommends staying at or below 2,300 mg of sodium per day to maintain healthy blood pressure. If you already have kidney disease or hypertension, 1,500 mg may be a more appropriate target.
Most dietary sodium doesn’t come from the salt shaker. It hides in processed foods, restaurant meals, canned soups, deli meats, and condiments. Reading nutrition labels is the single most effective way to cut back. Cooking at home with herbs, spices, citrus, and vinegar instead of salt makes the transition easier than you might expect.
Watch Your Blood Pressure Closely
High blood pressure damages the small blood vessels inside your kidneys, reducing their ability to filter waste over time. Current guidelines from the international kidney disease organization KDIGO recommend a systolic blood pressure target below 120 mmHg for adults with chronic kidney disease, when tolerated. Even if your kidneys are currently healthy, keeping blood pressure in a normal range is one of the most protective things you can do.
If you don’t know your blood pressure, get it checked. Home monitors are inexpensive and accurate enough for routine tracking. Regular physical activity, limiting sodium, maintaining a healthy weight, moderating alcohol, and managing stress all contribute to lower readings. If lifestyle changes aren’t enough, medication can close the gap.
Manage Blood Sugar Before It Causes Damage
Diabetes is the other leading cause of kidney disease. Persistently elevated blood sugar damages the tiny filtering units inside each kidney, gradually reducing function over years. For people with diabetes, kidney disease guidelines recommend keeping HbA1c (a three-month average of blood sugar) in an individualized target range, typically between below 6.5% and below 8%, depending on individual risk factors.
If you don’t have diabetes, maintaining a healthy weight and staying active are the strongest defenses against developing it. If you do have diabetes or prediabetes, consistent blood sugar management through diet, exercise, and prescribed treatment directly protects your kidneys. Even modest improvements in blood sugar control reduce the risk of kidney complications.
Be Careful With Pain Relievers
Over-the-counter anti-inflammatory pain relievers like ibuprofen and naproxen can reduce blood flow to your kidneys by blocking the production of compounds that keep the kidney’s blood vessels dilated. In young, healthy people with occasional use, this effect is minimal and reversible. But frequent or long-term use, especially when combined with dehydration, raises the risk of acute kidney injury.
The risk climbs significantly if you’re older, already have reduced kidney function, take blood pressure medications, or are dehydrated. If you need regular pain relief, talk to your doctor about alternatives. Acetaminophen is generally easier on the kidneys, though it carries its own risks at high doses. The key rule: use anti-inflammatory painkillers at the lowest effective dose for the shortest time possible.
Eat Protein in Moderation
Protein is essential, but your kidneys handle the waste products of protein metabolism. The recommended amount for healthy adults is 0.8 grams of protein per kilogram of body weight per day. For a 150-pound person, that’s roughly 55 grams. Most Americans eat well above this level.
There’s no strong evidence that moderately high protein intake damages healthy kidneys. But if you already have early kidney disease, research suggests that limiting protein may slow the loss of kidney function. In that case, working with a dietitian who specializes in kidney health helps you get enough nutrition without overloading your kidneys. Plant-based protein sources like beans, lentils, and tofu tend to produce less metabolic waste than red meat, making them a kidney-friendlier choice regardless of your current kidney health.
Maintain a Healthy Weight
Excess body weight puts direct physical and metabolic strain on your kidneys. In obesity, individual filtering units inside the kidney are forced to work harder than they should, a state called hyperfiltration. Over time, this overwork leads to scarring and progressive loss of functioning kidney tissue. It creates a cycle: as some filtering units fail, the remaining ones compensate by working even harder, accelerating further damage.
Obesity also increases the risk of diabetes and high blood pressure, both of which compound kidney strain. Even modest weight loss, in the range of 5% to 10% of body weight, can meaningfully reduce these risks. The approach matters less than consistency: find an eating pattern and activity level you can sustain.
Be Skeptical of Herbal Supplements
Many herbal and dietary supplements are not tested for kidney safety, and some are directly toxic to the kidneys. Aristolochic acid, found in certain traditional Chinese herbal preparations, has been linked to chronic kidney disease and urinary tract cancers. Cape aloe, commonly used as a laxative and anti-inflammatory, has been implicated in cases of acute kidney injury through inflammation and dehydration.
The broader problem is that supplements aren’t regulated the same way medications are. They can contain unlisted ingredients, heavy metals, or contaminants. If you take any herbal products regularly, make sure your doctor knows, especially if you have any existing kidney concerns. “Natural” does not mean safe for your kidneys.
Know Your Numbers
Kidney disease rarely causes symptoms until it’s advanced. The most reliable way to catch problems early is through routine blood work that includes your estimated glomerular filtration rate, or eGFR. This number estimates how well your kidneys are filtering. In healthy adults, a normal eGFR is above 90, but it naturally declines with age. Average values range from about 116 in your twenties to around 75 after age 70.
A urine test for protein (albumin) is the other key screening tool. Healthy kidneys keep protein in the blood, so finding it in urine signals early damage. If you have diabetes, high blood pressure, a family history of kidney disease, or are over 60, regular screening is especially important. These are simple, inexpensive tests that can catch kidney disease years before symptoms appear, when intervention is most effective.