Healthy Kidneys: 12 Essential Ways to Know and Protect

Your kidneys work quietly.

Most of the time, you do not feel them working.

They filter waste from your blood.

They remove extra water.

They help balance sodium, potassium, phosphorus, and other minerals.

They help control blood pressure.

They help your body make red blood cells.

They also help support healthy bones.

That is a lot of work for two organs about the size of your fists.

But there is an important problem.

You cannot tell that you have healthy kidneys simply because you feel well.

Early chronic kidney disease often causes no obvious symptoms.

You may have normal energy.

You may sleep well.

Your skin may look normal.

Your urine may look normal.

Kidney damage can still be present.

The safest way to understand kidney health is to combine your risk factors, blood pressure, medical history, and the right blood and urine tests.

Two tests are especially important.

They are eGFR and uACR.

This guide explains how to know whether your kidneys need attention and 12 practical ways to protect them.

For the complete NextFitLife kidney library, visit the Kidney Health and Disease Hub.

Quick Answer: How Do You Know if Your Kidneys Are Healthy?

You cannot know from symptoms alone.

Healthy-looking urine does not prove healthy kidneys.

Feeling energetic does not prove healthy kidneys.

Two of the most useful kidney checks are:

• eGFR: A blood-based estimate of how well your kidneys filter blood.
• uACR: A urine test that checks whether albumin is leaking into your urine.

Blood pressure is important too.

High blood pressure and diabetes are major causes of kidney disease.

If you are at increased risk, ask a healthcare professional whether you need kidney testing and how often.

What Do Healthy Kidneys Actually Do?

Your kidneys do much more than make urine.

Healthy kidneys help keep your internal environment stable.

They Filter Blood

Blood constantly flows through your kidneys.

Tiny filtering structures help remove waste and extra water.

The waste leaves your body in urine.

They Balance Water and Minerals

Your kidneys help regulate water.

They also help balance sodium, potassium, phosphorus, and other minerals.

Your muscles, nerves, and heart depend on these balances.

They Help Control Blood Pressure

Your kidneys and blood pressure are closely connected.

Kidney problems can contribute to high blood pressure.

High blood pressure can also damage the kidneys.

This relationship is one reason blood pressure and kidney health should be considered together.

Explore this connection further in our Heart and Cardiovascular Health Hub.

They Support Red Blood Cell Production

The kidneys help produce a hormone called erythropoietin.

This hormone tells your bone marrow to make red blood cells.

Advanced kidney disease can interfere with this process and contribute to anemia.

They Help Protect Bone Health

Your kidneys help regulate minerals and activate vitamin D.

These processes are important for bones.

Kidney disease can disturb calcium and phosphorus balance.

How Do You Really Know if Your Kidneys Are Healthy?

This is the most important change from the older version of this guide.

You cannot confirm healthy kidneys from how your body feels.

Early CKD may have no symptoms.

Testing matters most when you have risk factors.

Two simple tests give healthcare professionals an important picture of kidney health.

1. eGFR Blood Test

eGFR means estimated glomerular filtration rate.

It estimates how well your kidneys filter your blood.

The estimate usually uses a blood creatinine result along with other information.

A lower number can mean reduced kidney filtration.

One result alone does not always diagnose chronic kidney disease.

2. uACR Urine Test

uACR means urine albumin-to-creatinine ratio.

Healthy kidneys normally keep most albumin in the blood.

When those filters are damaged, albumin can leak into urine.

That leakage can be an early sign of kidney damage.

You can have an eGFR above 60 and still have important albumin in the urine.

That is why both tests matter.

3. Blood Pressure

Blood pressure is not technically a kidney function test.

But it is a very important kidney health number.

High blood pressure may damage kidney blood vessels over time.

Kidney disease can also make blood pressure harder to control.

12 Essential Ways to Protect Healthy Kidneys

1. Know Your Kidney Disease Risk

You may need closer kidney monitoring if you have:

• Diabetes
• High blood pressure
• Heart disease
• Heart failure
• Obesity
• A family history of kidney disease or kidney failure
• A past episode of acute kidney injury
• Older age
• Regular exposure to medicines that can affect the kidneys

You do not need to wait for symptoms before asking about testing.

In fact, waiting for symptoms can miss early disease.

2. Know Your eGFR and uACR When Testing Is Appropriate

Ask whether your kidney check includes both a blood and urine test.

Creatinine alone does not give the whole picture.

An eGFR tells you about filtration.

A uACR tells you whether albumin is leaking into your urine.

Together they provide a much clearer picture of kidney function.

People with diabetes commonly need regular kidney testing.

People with hypertension, cardiovascular disease, or other major risks should ask how often testing is appropriate.

For a deeper explanation, read our Kidney Disease Symptoms, Tests, Prevention, and Red Flags guide.

3. Control High Blood Pressure

High blood pressure is a major kidney risk.

It can damage the small blood vessels inside your kidneys.

Managing blood pressure may include:

• Eating less sodium
• Regular movement
• Maintaining a suitable body weight
• Limiting alcohol
• Taking prescribed medicines correctly
• Checking blood pressure as advised

Your personal blood pressure goal depends on your health and medical history.

Do not stop prescribed blood pressure medicine because you feel well.

4. Manage Diabetes and Blood Sugar

Diabetes is another major cause of CKD.

High blood glucose can damage tiny blood vessels in your kidneys over time.

If you have diabetes:

• Know your blood glucose goals
• Check your A1C as advised
• Take medicines as prescribed
• Monitor blood pressure
• Ask about regular eGFR and uACR testing

Visit the Diabetes and Blood Sugar Management Hub for broader diabetes education.

5. Reduce Excess Sodium

Sodium can raise blood pressure.

High sodium intake can also increase fluid retention in some people.

A general adult target often used in kidney prevention guidance is less than about 2,300 milligrams of sodium per day.

Your personal target can be different.

Major sodium sources include:

• Processed meat
• Fast food
• Instant noodles
• Salty snacks
• Ready meals
• Canned soup
• Stock cubes
• Sauces

Use garlic, herbs, spices, onion, lemon, and vinegar to build flavor.

If you have CKD, ask before using a salt substitute.

Many contain potassium chloride.

6. Eat a Balanced Diet

You do not need a special detox diet to protect your kidneys.

For most people without a prescribed renal diet, build meals around:

• Vegetables
• Whole fruit
• Whole grains
• Beans and lentils
• Suitable protein foods
• Fish
• Nuts and seeds
• Unsaturated fats

Eat fewer heavily processed foods.

Limit excess added sugar and sodium.

If you already have kidney disease, your diet may need to change according to potassium, phosphorus, protein, sodium, fluid needs, kidney stage, and treatment.

Do not copy another patient's renal diet.

Read our Diet for Kidney Disease guide if you have diagnosed CKD.

For general food ideas, see Foods for Healthy Kidneys.

7. Stay Hydrated Without Overdoing It

Your kidneys need appropriate hydration.

They do not need a water challenge.

There is no evidence that forcing huge amounts of water makes healthy kidneys healthier.

Your fluid needs depend on:

• Your body size
• Your activity
• Weather
• Pregnancy
• Your diet
• Your medicines
• Your heart health
• Your kidney function

Drink enough to meet your needs.

Do not force water to make your urine completely clear.

Clear urine is not a test of kidney health.

People with advanced kidney disease, kidney failure, severe swelling, or heart failure may need a fluid limit.

8. Stay Physically Active

Physical activity supports kidney health indirectly in several ways.

It can help:

• Lower blood pressure
• Improve blood sugar control
• Support heart health
• Maintain muscle
• Support a healthy body weight
• Improve sleep

Aim for regular movement that matches your ability and health.

Walking is a good place to start for many people.

If you have advanced kidney disease or another serious medical condition, ask your care team what exercise level is appropriate.

9. Avoid Tobacco and Keep Alcohol Low

Smoking damages blood vessels.

Kidneys depend on a healthy blood supply.

Smoking is also linked with cardiovascular disease and higher kidney risk.

If you smoke, quitting is one of the strongest steps you can take for your health.

Alcohol can raise blood pressure when intake is high.

If you do not drink, you do not need to start for kidney health.

10. Use Pain Medicines and Supplements Carefully

This is easy to overlook.

Common pain medicines called NSAIDs can harm kidney function in some situations.

Examples include:

• Ibuprofen
• Naproxen
• Diclofenac

The risk can rise when NSAIDs are used often, at high doses, during dehydration, or in people with CKD.

Do not stop a medicine prescribed by your doctor on your own.

Instead, ask your doctor or pharmacist whether your medicines are safe for your kidney function.

Herbal products are not automatically safe either.

Some can damage kidneys or interact with medicine.

11. Treat Urinary Infections and Urinary Problems Promptly

A bladder infection can sometimes spread upward to the kidneys.

Do not ignore symptoms such as:

• Pain or burning with urination
• Fever
• Chills
• Back or side pain
• Blood in the urine
• Vomiting
• Feeling very unwell

Severe side pain can also come from kidney stones or urinary blockage.

These conditions need proper assessment.

Good personal hygiene is useful.

But hygiene alone cannot prevent every urinary infection.

12. Keep Regular Health Checks and Take Medicines as Prescribed

Kidney protection is not one single habit.

It is part of overall health care.

Keep routine medical visits.

Know your blood pressure.

Check your blood sugar if you have diabetes.

Know your cholesterol when appropriate.

Review medicines.

Get kidney tests when your risk makes testing appropriate.

Sleep matters too.

NIDDK encourages about seven to eight hours of sleep as part of a healthy kidney lifestyle.

Small habits add up.

Kidney Function Tests Explained Simply

A kidney health test is usually not just one number.

Serum Creatinine

Creatinine is a waste product related to normal muscle activity.

Your kidneys remove creatinine from your blood.

Blood creatinine is used to estimate eGFR.

Creatinine alone can be affected by muscle mass and other factors.

Estimated Glomerular Filtration Rate

eGFR estimates how well the kidneys are filtering.

A higher eGFR generally means better filtration.

A low value needs clinical interpretation.

Age, illness, hydration, medicine, muscle mass, and other factors can affect the result.

Urine Albumin to Creatinine Ratio

uACR measures albumin relative to creatinine in a urine sample.

Normally, very little albumin should appear in urine.

A uACR below 30 mg/g is generally considered within the normal range.

A result of 30 mg/g or higher may indicate albuminuria.

A high result often needs repeat testing.

Urinalysis

A urinalysis can check for blood, protein, glucose, infection markers, and other findings.

It can be useful.

But it is not the same thing as the uACR test.

Blood Urea Nitrogen

BUN measures urea nitrogen in your blood.

It may be part of a kidney evaluation.

But BUN is affected by several things and is not usually interpreted by itself.

What Do eGFR and uACR Numbers Mean?

These numbers should be interpreted together.

eGFR

An eGFR below 60 may be a sign of reduced kidney function.

But one low result does not always mean you have chronic kidney disease.

uACR

A uACR below 30 mg/g is generally preferred.

A result of 30 mg/g or higher may indicate kidney damage.

Why Repeat Testing Matters

Chronic kidney disease generally means kidney damage or reduced function that lasts for at least three months.

This means one abnormal test may need to be repeated.

Temporary illness, dehydration, medicine, exercise, infection, and other factors can sometimes affect results.

Do not diagnose CKD from one laboratory result without professional interpretation.

What Does Not Prove Your Kidneys Are Healthy?

This section corrects several common myths.

Feeling Energetic

Feeling good is welcome.

It does not prove that kidney function is normal.

Sleeping Well

Good sleep supports health.

But sleep quality cannot tell you your eGFR or urine albumin level.

Clear Skin

Healthy-looking skin does not prove that your kidneys are healthy.

No Puffy Eyes

Some kidney diseases can cause swelling.

But the absence of swelling does not rule out kidney disease.

Normal Appetite

Advanced kidney disease can affect appetite.

But a normal appetite cannot rule out early CKD.

Clear Urine

Urine color changes mainly with hydration and many other factors.

Very clear urine may simply mean you drank a lot of fluid.

Normal looking urine does not rule out albumin or reduced kidney filtration.

Normal Urination

You can still pass urine even when kidney function is reduced.

Urine volume alone is not a reliable kidney function test.

Possible Kidney Disease Warning Signs

Early CKD may cause no symptoms.

When kidney problems become more advanced, possible symptoms can include:

• Foamy urine
• Blood in urine
• Swelling in the feet, ankles, legs, hands, or around the eyes
• Urinating more often
• Urinating less than usual
• Tiredness
• Weakness
• Itching
• Loss of appetite
• Nausea
• Muscle cramps
• Trouble sleeping
• Shortness of breath
• High blood pressure

These symptoms have many possible causes.

They do not prove kidney disease.

Testing is needed.

What Should You Eat for Healthy Kidneys?

There is no single perfect kidney diet for everyone.

For most people with normal kidney function, a balanced diet can include:

• Vegetables
• Fruit
• Whole grains
• Beans
• Lentils
• Nuts and seeds
• Fish
• Eggs
• Soy foods
• Suitable dairy foods
• Olive oil and other unsaturated fats

The most useful general goal is to eat more whole and minimally processed foods.

Eat less sodium.

Keep added sugar moderate.

Avoid treating any one food as a kidney medicine.

Blueberries do not repair kidneys.

Garlic does not cleanse kidneys.

Cauliflower does not pull toxins from kidney tissue.

A balanced eating pattern matters more.

Visit our Nutrition and Vitamins Hub for broader food and nutrient guidance.

Does Drinking More Water Make Your Kidneys Healthier?

Not necessarily.

You need enough fluid.

You do not need unlimited fluid.

Drinking extreme amounts of water does not improve normal kidney function.

Too much water can even become dangerous by lowering blood sodium.

Fluid needs vary.

People with some types of kidney disease or heart failure may need a fluid limit.

People prone to certain kidney stones may receive different hydration advice.

A better goal is healthy hydration, not maximum hydration.

Read our Kidney Cleanse and Kidney Health guide to understand why detox drinks and water flushes are not kidney treatment.

Medicines and Supplements That Deserve Extra Care

Your kidneys help process or remove many medicines.

Reduced kidney function can change how some medicines behave.

NSAID pain medicines are especially important to understand.

These medicines can reduce blood flow inside the kidneys.

Risk can be greater during dehydration.

Risk can also be higher with CKD.

Ask before regular use of:

• Ibuprofen
• Naproxen
• Diclofenac
• Other NSAID products

Read cold and flu medicine labels too.

Some combination products contain an NSAID.

Herbal Products

Natural does not mean kidney safe.

Some herbs can directly injure the kidneys.

Some contain high levels of potassium or other minerals.

Some interact with prescription medicines.

Some products may contain ingredients not clearly shown on the label.

Tell your healthcare team about every supplement you take.

Can You Improve Your eGFR Naturally?

Be careful with promises to raise eGFR quickly.

An eGFR can improve when a temporary cause is corrected.

For example, kidney function affected by dehydration, infection, acute illness, or a medicine may improve when the problem is treated.

Chronic kidney damage is different.

There is no food, supplement, juice, or exercise that guarantees a higher eGFR.

If you have CKD, the goal is often to protect remaining function and slow further loss.

Important steps can include blood pressure management, diabetes care, medicine review, healthy food choices, and follow up testing.

Do Healthy Kidneys Need a Detox?

No.

Healthy kidneys already filter your blood.

Commercial kidney cleanses do not make them perform an extra cleaning cycle.

Detox teas, juice fasts, excessive water, laxatives, and herbal mixtures can sometimes create new problems.

Possible problems include dehydration, electrolyte changes, medicine interactions, and direct kidney injury.

Protect your kidneys instead of trying to flush them.

Who Should Ask About Kidney Testing?

Ask a healthcare professional about testing if you have major kidney risk factors.

These can include:

• Diabetes
• High blood pressure
• Heart disease
• Heart failure
• A family history of kidney failure
• A history of acute kidney injury
• Older age
• Obesity
• Known urinary tract or kidney problems

People with diabetes commonly need routine kidney testing.

Your healthcare professional can tell you how often to test based on your personal risk.

When Should Kidney Symptoms Be Checked Quickly?

Get prompt medical advice for:

• Blood in urine
• New or worsening swelling
• Persistent foamy urine
• Significant changes in urination
• Severe side or back pain
• Fever with urinary symptoms
• Repeated vomiting
• Persistent nausea or poor appetite

Seek urgent care for:

• Inability to urinate
• Very little urine with severe illness
• Severe shortness of breath
• Chest pain
• Confusion
• Fainting
• Severe weakness
• Rapidly worsening swelling

Kidney Health in 2026: Why Testing Matters

Kidney disease remains common.

Current CDC estimates say about 37 million U.S. adults have chronic kidney disease.

That is about 14 percent of adults.

More importantly, most people who have it do not know.

About 87 percent of adults with CKD were estimated to be unaware that they had the condition.

This is why waiting to feel sick is not a good screening plan.

Know your risk.

Use appropriate testing.

Act early when a problem is found.

References and Sources

1. National Institute of Diabetes and Digestive and Kidney Diseases: Preventing Chronic Kidney Disease
   Explains kidney risk factors, testing, sodium, healthy eating, physical activity, blood pressure, diabetes management, and prevention.
   Read the NIDDK kidney prevention guide
2. National Kidney Foundation: CKD Risk Factors, Testing, and Prevention
   Explains eGFR, uACR, CKD risk factors, repeat testing, hydration, blood pressure, blood sugar, smoking, exercise, and weight management.
   Read the National Kidney Foundation kidney testing guide
3. Centers for Disease Control and Prevention: Chronic Kidney Disease in the United States, 2026
   Provides current U.S. CKD estimates, risk information, awareness data, diabetes statistics, and high blood pressure statistics.
   Read the CDC 2026 CKD report
4. National Institute of Diabetes and Digestive and Kidney Diseases: Keeping Kidneys Safe and Smart Choices About Medicines
   Explains medicine safety, NSAIDs, dehydration, kidney injury risk, and questions to ask a doctor or pharmacist.
   Read the NIDDK medicine safety guide
5. National Kidney Foundation: Know Your Kidney Numbers
   Explains the two key kidney tests, eGFR and uACR, how the numbers are interpreted, and why repeat testing can matter.
   Read the National Kidney Foundation kidney numbers guide

Conclusion: Know Your Numbers and Protect Healthy Kidneys

The best way to protect healthy kidneys is not to look for a detox drink or wait for symptoms.

Know your risks.

Know your blood pressure.

Control diabetes if you have it.

Eat less sodium.

Stay active.

Use medicines safely.

Drink an appropriate amount of fluid.

Avoid tobacco.

And get eGFR and uACR testing when your risk makes testing appropriate.

Remember that early kidney disease can be silent.

Your action today: If you have diabetes, high blood pressure, heart disease, a family history of kidney failure, or another kidney risk factor, ask your healthcare professional whether you should know your eGFR and uACR.

Continue Reading on NextFitLife

Use these NextFitLife resources to learn more about kidney health, testing, nutrition, prevention, and related conditions.

• Kidney Health and Disease Hub
• Kidney Disease Symptoms, Tests, Prevention, and Red Flags
• Diet for Kidney Disease: Foods and Safer Eating
• Foods for Healthy Kidneys
• Kidney Cleanse: What Actually Supports Kidney Health
• Renal Glycosuria: Causes, Diagnosis, and Care
• Heart and Cardiovascular Health Hub
• Diabetes and Blood Sugar Management Hub
• Nutrition and Vitamins Hub
• NextFitLife Health Hub