How your kidneys and glucose are connected—and what that means for your health

Published: Sep. 11, 2025

5 min read

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The content in this article should not be taken as medical advice. Please consult with your healthcare provider regarding your individual health needs.

Kidneys are small but mighty organs responsible for a lot more than removing waste from the body. Along with filtering your blood, your kidneys help balance fluids, control blood pressure, and keep electrolytes in check. They even play a part in making red blood cells and helping your body absorb calcium. These jobs are all interconnected, and glucose plays a big role in keeping everything running smoothly. Understanding how kidneys and stable glucose levels are interconnected is a powerful first step toward taking care of your kidney (and glucose) health for the long haul.

The kidney-glucose connection

Higher than usual glucose levels for extended periods of time can be rough on our bodies—including our kidneys. Here’s a simpler way to picture it: if your glucose stays within your target range, your blood flows like water—smooth and easy for your kidneys to filter. But when glucose runs high, your blood gets thicker and “stickier”, which can make things much harder on your kidneys.

The bottom line? Keeping your glucose within your target range helps your blood flow smoothly, and that means better support for your kidneys.

You might be surprised to learn that some people with diabetes experience changes in kidney function, which may lead to long-term complications like kidney disease.

There are plenty of ways you can take care of your kidney health—no matter where you’re starting from. But first, let’s get into the details behind kidney disease so you’ll know exactly what to watch for.

The five stages of kidney disease

Kidney disease doesn’t happen overnight. It progresses in stages and is evaluated based on two tests: eGFR (blood test that shows how well the kidneys filter) and uACR (urine test that shows the protein in the urine). Let’s take a look at the five stages a little closer:

Stage 1:

Evidence of ongoing kidney damage (eGFR 90 or higher and uACR 30 or higher) for 3+ months

Stage 2:

Gradual loss of kidney function and ongoing kidney damage (eGFR 60–89 and uACR 30 or higher) for 3+ months

Stage 3a:

Mild to moderate loss of kidney function (eGFR 45–59) for 3+ months

Stage 3b:

Moderate to severe loss of kidney function (eGFR 30–44) for 3+ months

Stage 4:

Severe loss of kidney function (eGFR 15–29) for 3+ months

Stage 5:

Kidney failure (eGFR less than 15) for 3+ months. Dialysis may be needed.

Here's the good news: knowing your eGFR and uACR numbers helps you and your doctor spot changes early, so you can take action before small problems become big ones. The sooner you know where you stand, the more options you have to slow or stop further damage.

Steps to help prevent kidney disease, starting now

Small steps make a real difference. Here’s how you can start tuning in to your kidney health right now:

1. Know your glucose patterns

Keeping glucose levels in an optimal range can lower your risk of kidney damage. A glucose biosensor like Stelo gives you data 24/7 so you can catch patterns early (like post-meal spikes or overnight dips) and adjust your daily habits with confidence.

2. Get regular lab work

Talk to your healthcare team about monitoring your kidney health with the following tests:

Urine tests like microalbumin/creatinine ratio
Blood tests like creatinine and eGFR
Cholesterol and lipid blood test

If you don’t know your latest numbers, it’s worth asking. Kidney issues often show up in the urine before they show up in the blood.

3. Check your blood pressure regularly

Keeping your blood pressure in a healthy range helps protect the delicate blood vessels in your kidneys. According to the American Heart Association, a healthy blood pressure is typically 120 or less for the systolic (upper number) and 80 or less for the diastolic (lower number), which can go a long way in supporting your kidney health.

If you’re not sure what a healthy range looks like for you, talk to your healthcare team.

4. Build kidney-friendly habits into your routine

Every healthy choice you make adds up when it comes to supporting your kidney health. Looking for a place to start? Try weaving in a few of these habits today:

Stay hydrated: Your kidneys love it when you stay hydrated. A quick way to check if you’re getting enough fluid? Peek at your pee—if it’s light yellow or clear, you’re on the right track. If it’s darker, that’s your cue you may need to drink more fluid.
Get moving, your way: Whether it’s a walk around the block, gardening, or a quick dance break, staying active can help regulate your blood pressure, weight, and stress (all things your kidneys appreciate).
Make balanced meals your go-to: Mixing up your plate with protein, carbs, healthy fats, and plenty of vitamins and minerals can helps your kidneys function at their best.
Take your medications exactly as prescribed: Medications can make a big difference in helping your glucose, blood pressure, and cholesterol stay in a healthy range, all working together to give your kidneys the support they deserve.

Some medications like ACE inhibitors, Angiotensin II receptor blockers (ARBs), SGLT2 inhibitors, or GLP-1 receptor agonists may even offer kidney-protective benefits. If you already have kidney disease, your provider might refer you to a nephrologist (kidney specialist) to guide your care.

Remember: everyone’s journey is unique, so be sure to check in with your healthcare provider for personalized tips, especially if you’re already managing kidney disease.

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The earlier you know, the more you can do

Healthy glucose levels are important for maintaining healthy kidneys. And healthy glucose starts with awareness: of your habits, your levels, and how your body responds. Whether you’re newly diagnosed or have been living with diabetes for years, it’s never too early (or too late) to protect your kidney health and take steps to prevent kidney disease.

Stay curious. Stay consistent. And don’t hesitate to ask your healthcare team specific questions, especially about your labs. With the right tools and support, you can protect your kidneys and your glucose health, one informed choice at a time.