Keeping your kidneys healthy involves managing blood pressure and diabetes, eating a balanced diet, staying appropriately hydrated and using medicines safely. Testing is also important when you have risk factors, because early kidney disease often causes no noticeable symptoms.
These habits can help reduce preventable risks, although they cannot prevent every kidney condition. People with existing kidney disease need advice tailored to their diagnosis and test results.
Your kidneys remove waste and excess water from the blood to make urine. Damage to their blood vessels can interfere with this work.
High blood pressure can damage the kidneys, while kidney disease can make blood pressure harder to control. Protecting kidney health therefore involves looking after the wider cardiovascular system as well.
High blood pressure frequently causes no symptoms. Feeling well does not confirm that your readings are within a healthy range.
If you have hypertension:
Blood pressure treatment and lifestyle changes can help prevent or slow kidney damage. Do not stop prescribed treatment because a reading has improved.
Diabetes can damage the kidneys over time. Keeping blood glucose within your agreed target range can help reduce this risk.
Follow your treatment plan, attend diabetes reviews and discuss kidney testing. Treatment should account for your glucose levels, blood pressure, kidney function and other health conditions.
Do not wait for kidney pain or urinary symptoms before asking about testing. Diabetes-related kidney damage may develop without obvious warning signs.
Water supports normal kidney function, but drinking more is not always better.
Fluid needs vary with activity, weather, illness and medical conditions. Severe dehydration can reduce blood flow to the kidneys. Conversely, some people with kidney failure or heart disease need to limit fluids.
Practical habits include:
Avoid forcing large quantities of water to “flush” your kidneys. Appropriate hydration means avoiding both dehydration and fluid overload.
People with previous stones may need a specific prevention plan. Read more about kidney and ureteric stones.
A balanced eating pattern can support blood pressure, weight and general health.
Include a variety of vegetables, fruit, whole grains and suitable protein sources. Reduce frequent consumption of heavily salted packaged foods, instant meals and salty snacks.
Useful changes include:
Consistency matters more than relying on one food promoted as beneficial for the kidneys.
No. People with healthy kidneys should not automatically follow restrictions intended for advanced kidney disease.
If you have chronic kidney disease, advice about protein, potassium, phosphorus, sodium and fluids should reflect your blood tests, kidney function and nutritional needs. Unnecessary restriction can make it harder to eat adequately.
Discuss protein supplements and potassium-containing salt substitutes before using them if you have kidney disease.
For people with stones, dietary advice also depends on stone composition. See the guide to what to eat and limit in a kidney stone diet.
Regular physical activity, maintaining a suitable weight and stopping smoking support long-term health.
Choose activity you can sustain, such as walking, cycling or swimming. Build up gradually if you have been inactive, and ask about suitable exercise if you have significant medical limitations.
Adequate sleep and avoiding excessive alcohol also support the management of conditions that affect kidney health.
Some medicines can affect kidney function, particularly during dehydration or illness.
Non-steroidal anti-inflammatory drugs, or NSAIDs, include medicines such as ibuprofen and naproxen. Prolonged use can harm the kidneys, and use during dehydration or low blood pressure can contribute to acute kidney injury.
Before taking an over-the-counter product:
Ask for an individual medicine plan if you become unwell with vomiting, diarrhoea or poor fluid intake. Do not independently stop prescribed medicines without advice.
“Kidney cleanse” teas, herbal mixtures and supplements are not a substitute for medical assessment or treatment.
Products marketed as natural can contain ingredients that affect kidney function, interact with medicines or cause problems for people with existing disease. Evidence supporting detox programmes is limited.
Discuss supplements with your healthcare team, including products used for weight loss, bodybuilding or general wellness.
Early chronic kidney disease often has no symptoms. Testing is particularly relevant if you have diabetes, high blood pressure, heart disease or a family history of kidney failure.
Two important assessments are:
| Test | What it helps assess |
|---|---|
| Blood creatinine with estimated glomerular filtration rate, or eGFR | How well the kidneys filter blood. |
| Urine albumin-to-creatinine ratio, or uACR | Albumin leakage into urine, which can indicate kidney damage. |
These tests provide different information. A clinician may recommend repeat measurements to confirm an abnormal result or assess changes over time.
The testing schedule should reflect individual risk and previous findings. An ultrasound alone does not replace blood and urine assessment of kidney health. NIDDK
Arrange assessment for persistent swelling, unexplained changes in urination or other ongoing concerns.
Seek urgent help for:
Acute kidney injury can occur during illness, dehydration, infection or obstruction and may require prompt treatment.
Visible blood in urine also needs assessment. Read about painless blood in urine and its possible causes.
Managing diabetes and high blood pressure, when present, is central to reducing kidney damage. Healthy habits and appropriate testing also matter.
No. Fluid requirements vary. Some medical conditions require a fluid restriction, so a universal target is unsuitable.
Reference: National Kidney Foundation — Healthy HydrationYes. Early kidney disease often has no noticeable symptoms, which is why risk-based testing matters.
No. Risk depends on the medicine, dose, duration, kidney function and circumstances such as dehydration. Ask which option is suitable for you.
Reference: NIDDK — Keeping Kidneys SafeThere is insufficient evidence to recommend them, and some products may cause harm or interact with treatment.
Reference: National Kidney Foundation — Herbal SupplementsNo. Restrictions should reflect an individual diagnosis, nutritional needs and test results rather than a universal food ban.
Ask whether you need blood creatinine with eGFR and a urine albumin-to-creatinine ratio. Your clinician can explain the appropriate timing.
Keeping your kidneys healthy involves consistent everyday care: managing blood pressure and diabetes, eating balanced meals, drinking appropriately and using medicines safely.
Testing remains important for people at risk, even when they feel well. Existing kidney disease requires an individual plan for treatment, nutrition, fluids and follow-up.
Disclaimer: Website content and visuals are for general informational, educational and representational purposes only, may not reflect individual patient conditions or outcomes, and do not replace personalised medical advice, diagnosis or clinical assessment.