Getting the Most From a Continuous Glucose Monitor With Type 2 Diabetes

From everydayhealth.com

If you have type 2 diabetes, you’re likely very familiar with A1C tests, which measure the average amount of sugar (glucose) in your blood over the past three months.

However, A1C isn’t your only option for tracking your blood sugar levels: Continuous glucose monitors (CGMs) have moved beyond type 1 diabetes care to being an important tool for type 2 management as well. People with type 1 or type 2 diabetes who use a CGM tend to have a lower A1C and more steady blood sugar.

Understanding CGMs

At first, CGMs were prescription-only and used by people with type 1 diabetes, a condition in which the body doesn’t make insulin. However, CGMs are now recommended for people with type 2 diabetes, whose bodies don’t make enough insulin and are resistant to it. You can even buy over-the-counter versions without a prescription.  

In fact, the 2026 American Diabetes Association Standards of Care were updated to reflect the fact that CGMs are now recommended as soon as type 2 diabetes is diagnosed. They’re also recommended for anyone previously diagnosed who could benefit from keeping a close watch on their blood sugar levels, including those who use insulin therapy, and those on other treatments that can cause low blood sugar.

“Updated studies show how valuable CGM is to anyone with type 2 diabetes,” says Amy Hess-Fischl, RDN, CDCES, president of health care and education for the American Diabetes Association. “Those with higher A1Cs can greatly benefit from CGM because they can now see the cause and effect of their meals and make adjustments quickly to have a big impact on reducing A1C.”

The Power of Instant Feedback

Real-time alerts from CGMs can help you adjust your diet, medication, and activity levels to prevent blood sugar fluctuations that can lead to complications like damage to your nerves, kidneys, blood vessels, eyes, and other parts of the body over time.

This real-time feedback is particularly helpful with meals, Hess-Fischl says. She describes a patient who had overindulged during a meal he loved, then received an alert that his glucose was rising higher than usual.

“Instead of getting mad at himself for being human, he took a 20-minute walk and it levelled off his readings,” Hess-Fischl says. “I was so proud of him, because that is exactly what CGM can do — instead of feeling helpless or defeated, he made a positive behaviour change.”

It’s not just about food choices though.

Stress and sleep, which are often interconnected, can also impact blood sugar levels. Cortisol, the stress hormone, triggers your liver to release more glucose into your blood. When you don’t get enough sleep, your body reacts as though it’s under stress. As a result, you may find that you wake up with higher morning blood sugar than usual.

Meanwhile, exercise can lower your blood sugar for up to 24 hours or more after a workout, since it makes your body more sensitive to insulin. Certain medications, like statins (used to lower LDL, or “bad,” cholesterol) and immunosuppressive drugs (like corticosteroids, used in arthritis treatment), can cause changes in your blood sugar too.

“Before CGMs became very popular, most of our focus was on looking at the A1C, which only really showed trends and average,” says Pouya Shafipour, MD, an obesity medicine physician at Providence Saint John’s Health Center in Santa Monica, California. “CGMs show the exact timing of your glucose levels and the relationships to food, sleep, stress, exercise, and medication, which is really empowering for both patients and doctors.”

Tracking Your A1C

A CGM uses something called the glucose management indicator to estimate your A1C, without the need for a blood draw. This is a formula using the average of your glucose readings over about two weeks.

Keep in mind that this is only an estimate, so it may not exactly match your actual A1C. But for most patients, consistent monitoring removes the anxiety of quarterly blood work by providing a daily running average, Dr. Shafipour says.

“Instead of waiting every three to four months to go to doctor visits and guessing or worrying about A1C, they have a tool to see if they’re in range most of the time,” Shafipour adds.

Understanding the Data

CGMs include your current glucose reading, plus a trend arrow that shows if it’s rising or falling. This helps you see how certain lifestyle choices or medications are affecting you. Meanwhile, retrospective data summarizes all of your readings for a big-picture view of your glucose levels.

The main metric to focus on is time in range. You should aim to spend more than 70 percent of time with your blood sugar between 70 to 180 mg/dL, which correlates loosely to an A1C of 7 percent or below.

You’ll get a report with a curve that shows all glucose readings in a 24-hour window. That helps you spot patterns like post-meal spikes and overnight drops, and swings that could point to inconsistencies in how you take your medicine.

“Learning the trends and using the reports takes time, but with practice, it is easy to see how the real-time data can help make positive, lasting behaviour changes,” Hess-Fischl says.

Sharing Data With Your Healthcare Team

Remote monitoring with a CGM allows your doctor to make more nimble changes to your diabetes regimen, like medication adjustments, in between physical appointments.

The data can also help you have a more productive conversation with your doctor, says Hess-Fischl.

Questions to Ask Your Doctor

• What are my goals before and after meals?
• Why am I experiencing low blood sugar (readings under 70 mg/dL) at certain times, and how can I prevent it?
• How can I reduce the swings between high and low (glycaemic variability)?
• When do we need to consider adjusting my medication or insulin based on these trends?
• How often should I be confirming CGM readings with a finger stick?
• Can we create a plan for when to contact the office versus when to manage high or low readings myself?

The Takeaway

• CGMs are now recommended for everyone who is newly diagnosed with type 2 diabetes.
• You can use your CGM data to better understand how diet, medication, exercise, stress, and sleep impact your blood sugar levels from day to day.
• Sharing this data with your healthcare team allows your doctor to make adjustments to your treatment plan in between physical appointments.

https://www.everydayhealth.com/type-2-diabetes/using-continuous-glucose-monitor-with-type-2-diabetes/