Stopping CGM Use Worsens Blood Sugar in Type 2 Diabetes

What Was Studied and Why It Matters

Researchers wanted to know what happens to blood sugar levels when people with Type 2 diabetes stop using a continuous glucose monitor (CGM). CGMs are small wearable sensors that track blood sugar around the clock, giving users instant feedback on how food, exercise, and daily habits affect their glucose levels. While studies have shown CGMs can help improve blood sugar control — even in people who don't use insulin — very little research had looked at what happens after the device is removed.

This question matters because CGMs can be a significant investment, and understanding whether their benefits last could help patients and doctors make smarter decisions about long-term use.

What the Researchers Did

The study, called the UNITE study, followed adults with Type 2 diabetes who were not using insulin. In the first phase, participants used a real-time CGM for two months alongside a nutrition-focused program. In the second phase, they stopped using the CGM for four months. Researchers then compared blood sugar data from the end of the CGM phase to data collected after those four months without it.

What They Found

The results were striking. When participants were actively using their CGM, they spent about 77% of their time with blood sugar in a healthy range (70–180 mg/dL). After four months without the CGM, that number dropped to just 60% — a significant and meaningful decline.

• Multiple other measures of blood sugar control also worsened after CGM use stopped
• Diet quality and formal exercise habits didn't change significantly — suggesting the CGM itself played a key motivating role
• Overall physical activity levels did decrease slightly without the CGM

What This Means for Real Patients

Think of a CGM like a fitness tracker for your blood sugar. When you can see the numbers in real time, you're naturally more motivated to make small adjustments — choosing a lower-carb meal, taking a short walk after dinner, or catching a high before it becomes a problem. When that instant feedback disappears, so does much of the motivation it provided.

This study suggests that ongoing CGM use may be important for maintaining blood sugar gains, not just achieving them. For patients managing Type 2 diabetes without insulin, staying connected to your glucose data consistently could be a key part of long-term success.

If you're looking to maintain continuous CGM use, having a reliable source for sensors and supplies makes all the difference. MDS Diabetes offers a wide range of CGM supplies and diabetes management products to help you stay equipped without interruption.

Bottom Line

Stopping CGM use led to a real and measurable drop in blood sugar control for non-insulin Type 2 diabetes patients — even without major changes in diet. The data strongly suggests that continuous, long-term CGM use is likely necessary to maintain the improvements it creates. Talk to your healthcare provider about whether staying on a CGM long-term is right for your diabetes management plan.