Diabetes can affect the kidneys gradually, often before you notice any symptoms. High blood sugar can damage the kidneys’ filtering structures over time, and high blood pressure can add to that damage. The encouraging part is that you can check for changes and take steps to lower your risk.
Protecting your kidneys involves two kinds of tests, a plan for blood sugar and blood pressure, and treatment suited to your results. A “kidney detox” or supplement cannot take the place of those steps.
Want help building kidney-friendly daily habits? Explore the Kidney Health program. Use it as an educational resource alongside your diabetes and kidney care plan.
How does diabetes affect kidney function?
Your kidneys filter waste and extra fluid from your blood. Diabetes can damage those filters. One early sign may be albumin, a protein that normally stays in the blood, leaking into urine.
Diabetes and kidney disease can also affect each other. As kidney function changes, your healthcare team may need to review medicines and how you monitor blood sugar. Regular follow-up helps you respond before a change becomes harder to manage.
If you are new to kidney test results, our guide to understanding creatinine levels explains one part of the picture.
Ask for both kidney checks
A blood test is used to calculate your estimated glomerular filtration rate (eGFR), an estimate of how well your kidneys filter blood. A urine albumin-to-creatinine ratio (uACR) checks for albumin leaking into urine.
You need both results to understand your kidney health more fully. Someone can have albumin in their urine even when their eGFR has not fallen much. Ask your healthcare professional when you should have these tests and how often to repeat them.
Keep copies of the results. Trends over time are generally more informative than trying to interpret one number in isolation.
Manage blood sugar with a plan that fits you
Work with your diabetes care team on your blood sugar targets, monitoring, food choices, activity, and prescribed medicine. Bring your readings or device records to appointments if you check glucose at home.
Avoid stopping medicine because a reading improves. Some treatments do more than lower blood sugar: depending on your circumstances, your clinician may consider medicines with demonstrated kidney and heart benefits. Ask which options apply to you and how your kidney function affects medicine choices.
If you take medicine that can cause low blood sugar, discuss changes in meal timing or fasting with your care team before trying them.
Give blood pressure equal attention
High blood pressure can worsen kidney damage, including in people whose main diagnosis is diabetes. Ask what blood pressure target is appropriate for you and whether you should measure it at home.
Taking prescribed treatment, eating less sodium, being active as appropriate, and keeping follow-up appointments can all help. Some blood pressure medicines are used specifically because they may help protect the kidneys when urine albumin is present.
Looking for a structured routine around food and activity? Review the Kidney Health program. Check its recommendations against your glucose readings, kidney tests, and prescribed medicines.
Make food choices for both diabetes and kidney health
Start with practical changes: compare sodium on packaged foods, reduce sugary drinks, and plan meals with portions that work for your blood sugar. Our guide to reducing sodium and phosphorus in foods can help you spot hidden ingredients.
If kidney disease has already been diagnosed, ask whether you need changes to protein, potassium, phosphorus, or fluids. These restrictions are not automatic for everyone with diabetes or CKD. A renal dietitian can help balance kidney needs with blood sugar management without making meals unnecessarily restrictive.
Move regularly and review medicine safety
Activity you enjoy and can sustain may help you manage blood sugar, blood pressure, and heart health. Ask for personal advice if you have symptoms or another condition that affects exercise.
Tell your healthcare team about everything you take, including over-the-counter pain medicines, vitamins, and herbal products. Some nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen and naproxen, can pose kidney risks in certain situations. Ask which pain-relief options are suitable for you.
What if your kidney tests are abnormal?
An abnormal result deserves a conversation, not a guess. Ask whether the change appears persistent, whether your urine contains albumin, and whether treatment needs adjusting. Your clinician may repeat tests or arrange further assessment.
If your eGFR has changed, our article on whether a low GFR can be reversed explains why the cause and the pattern over time matter.
Bring these questions to your appointment:
- What are my latest eGFR and uACR results?
- How have they changed from my previous tests?
- What are my blood sugar and blood pressure goals?
- Are my current medicines appropriate for my kidney function?
- Would a renal dietitian or kidney specialist help me?
Frequently asked questions
Can diabetes cause kidney damage without symptoms?
Yes. Kidney changes may develop before you feel different. Blood and urine tests can detect problems that symptoms alone may miss.
Is a normal creatinine result enough to rule out kidney damage?
No. Your clinician also considers eGFR and a urine albumin test. Ask for an explanation of your results together.
Can better blood sugar control reverse diabetic kidney disease?
Managing blood sugar and blood pressure can help slow or prevent further damage. Whether an individual result improves depends on the cause and stage of disease; an improved number does not automatically mean established damage has disappeared.
Should I stop eating fruit if I have diabetes and CKD?
No blanket rule applies. Fruit choice and portion depend on your blood sugar plan and, if relevant, your potassium results. A dietitian can help you fit fruit into meals.
The takeaway
If you have diabetes, protect your kidneys by knowing your eGFR and uACR, following your blood sugar and blood pressure plans, and reviewing medicines as your results change. Build food and activity habits you can maintain, and ask for individual guidance if kidney disease is found.
Ready to make supportive habits more consistent? See the Kidney Health program. Use its ideas alongside regular testing and the treatment recommended by your healthcare team.