Keeping your kidneys healthy comes down to a handful of consistent habits: staying hydrated, managing blood pressure and blood sugar, eating moderate amounts of sodium and protein, staying active, and avoiding substances that strain your renal system. Most of these overlap with general health advice, but the specifics matter more than you might expect.
Stay Hydrated, but Don’t Overdo It
Your kidneys need adequate fluid to flush waste products out through urine and to maintain healthy urine concentration, which lowers the risk of kidney stones and urinary tract infections. The general guideline for healthy adults is roughly 11.5 cups (2.7 liters) to 15.5 cups (3.7 liters) of total fluid per day, and that includes fluid from food and all beverages, not just plain water.
That said, more is not better. Drinking excessive amounts of water can overwhelm your kidneys’ ability to excrete the surplus, diluting your blood sodium to dangerously low levels, a condition called hyponatremia. The practical approach is to drink when you’re thirsty, increase your intake during hot weather or exercise, and pay attention to your urine color. Pale yellow generally signals good hydration. Dark yellow means you need more fluid. Completely clear urine consistently may mean you’re overdoing it.
Keep Sodium Under a Teaspoon a Day
Excess sodium raises blood pressure, and high blood pressure is one of the two leading causes of kidney disease. The recommended daily limit is 2,300 milligrams, which works out to about one teaspoon of table salt. Most people exceed this without realizing it because the majority of dietary sodium comes from processed and restaurant foods, not the salt shaker.
Reading nutrition labels is the most effective way to track your intake. Canned soups, deli meats, frozen meals, condiments, and bread are common culprits. Cooking more meals at home and seasoning with herbs, spices, citrus, or vinegar instead of salt can make a significant difference over time.
Watch Your Protein Intake
Protein is essential for muscle maintenance and overall health, but your kidneys handle the byproducts of protein metabolism. For people with existing kidney disease who aren’t on dialysis, the suggested intake is 0.6 to 0.75 grams of protein per kilogram of body weight per day. For a 70-kilogram (154-pound) person, that’s roughly 42 to 53 grams daily. Research also suggests splitting protein sources evenly between animal-based options (meat, dairy, eggs) and plant-based ones (beans, lentils, tofu) for the best balance.
If your kidneys are healthy, you don’t need to restrict protein that aggressively. But consistently high protein diets, especially from heavily processed meats, still increase the filtering workload on your kidneys. A balanced approach with varied protein sources protects kidney function without sacrificing nutrition.
Manage Blood Sugar Early
Diabetes is the other leading cause of kidney disease. Chronically elevated blood sugar damages the tiny blood vessels inside the kidneys that handle filtration, gradually reducing their ability to clean your blood. For people with diabetes and some degree of kidney disease, international kidney-health guidelines recommend keeping HbA1c (a measure of average blood sugar over roughly three months) between 6.5% and 8.0%, individualized to each patient’s circumstances.
Even if you haven’t been diagnosed with diabetes, keeping blood sugar in a healthy range protects your kidneys long term. Regular physical activity, limiting added sugars and refined carbohydrates, maintaining a healthy weight, and getting screened periodically all help catch problems before they cause lasting damage.
Be Careful With Over-the-Counter Painkillers
Common anti-inflammatory painkillers like ibuprofen and naproxen can harm your kidneys, particularly with regular use. These drugs work by blocking the production of certain protective compounds in the kidneys that help keep blood flowing to the organ’s filters. In a young, healthy person with normal kidney blood flow, occasional use is generally well tolerated. But for anyone with reduced kidney blood flow (from dehydration, older age, high blood pressure, or existing kidney issues), these drugs can significantly impair filtration.
The risk ramps up at steady-state blood levels, which typically occurs after three to seven days of consistent use. If you rely on these painkillers frequently for chronic pain, talk to your doctor about alternatives. Acetaminophen is often a safer choice for the kidneys, though it carries its own risks for the liver at high doses.
Move Your Body Regularly
Exercise protects kidney function through its downstream effects on blood pressure, blood sugar, weight, and cardiovascular health. General guidelines recommend at least 150 minutes per week of moderate-intensity activity, things like brisk walking, cycling, or swimming.
A large five-year study published in the Journal of the American Society of Nephrology tested two approaches in older adults: moderate continuous exercise for 50 minutes twice a week and high-intensity interval training (four rounds of four minutes at high effort) twice a week. Both groups saw benefits, but the high-intensity group had significantly better protection against developing chronic kidney disease. You don’t need to jump straight to intense intervals, but the takeaway is clear: regular physical activity at a level that challenges your cardiovascular system makes a measurable difference for your kidneys.
Quit Smoking
Smoking damages blood vessels throughout the body, and the kidneys are particularly vulnerable. Nicotine triggers the release of stress hormones that raise blood pressure and heart rate, placing constant extra strain on the kidneys’ delicate filters. The chemicals in tobacco also stiffen and narrow blood vessels over time, reducing the flow of blood, oxygen, and nutrients to the kidneys.
The good news is that recovery begins quickly. Your body starts to heal within hours of your last cigarette. Within a few weeks, circulation improves noticeably, making it easier for blood to reach your kidneys. Within months, blood pressure begins to drop and overall cardiovascular strain decreases. Even long-term smokers benefit from quitting, and the earlier you stop, the more function you preserve.
Get Screened Periodically
Kidney disease is often called a “silent” condition because it rarely causes symptoms until significant damage has occurred. Two simple tests can catch problems early. The first is an estimated glomerular filtration rate (eGFR), which is calculated from a standard blood test and tells you how efficiently your kidneys are filtering. The second is a urine albumin-to-creatinine ratio (UACR), which checks for protein leaking into your urine. A UACR above 3 mg/mmol sustained for three months is diagnostic of chronic kidney disease.
What makes screening especially important is that kidney risk exists on a continuum. Even levels of albumin in the urine that fall within the technically “normal” range have been linked to worse cardiovascular outcomes as those levels climb. In other words, there’s no hard cutoff below which everything is perfectly fine. Catching a rising trend early gives you and your doctor the chance to intervene with lifestyle changes or medication before permanent damage sets in. If you have diabetes, high blood pressure, a family history of kidney disease, or you’re over 60, regular screening is particularly worthwhile.