CGM for Type 2 Diabetes: 3 Lessons My Continuous Glucose Monitor Taught Me

Using a CGM for type 2 diabetes, even for a short time, taught me more about my own body than years of finger-prick checks. In March 2025, I wore a continuous glucose monitor (CGM) and kept a 12-day record of my blood sugar through meals, workouts, and evenings out. I live with type 2 diabetes and do not use insulin, so I was curious what a CGM could show someone like me. Thank you for reading. Here I would like to share what I saw, the three habits it confirmed for me, and why I now believe that, at least in my case, stepping away from diabetes is possible, though never easy.

Table of Contents

1. Why I tried a CGM without insulin
2. What my meals showed
3. Remission: what “escaping diabetes” really means
4. 3 lessons from my CGM
5. Tips if you would like to try a CGM
6. Frequently asked questions

1. Why I tried a CGM for type 2 diabetes without insulin

A continuous glucose monitor is a small sensor worn on the arm that measures glucose every few minutes, day and night. CGMs used to be mostly for people on insulin, but more people with type 2 diabetes who do not use insulin are now trying them, and some sensors are sold over the counter in the U.S.

Diabetes is mostly a condition of daily habits, and so is its care. Unless diabetes is severe enough to need intensive treatment, I believe it is very important for us to understand our own bodies. A doctor’s guidance is essential, but no one can follow us through every meal. Self-understanding fills that gap, and a CGM is one of the best tools I have found for it.

2. What my meals showed

Over the years, I have been testing how different foods affect my blood sugar. Some results surprised me. For me, the most dangerous food turned out to be ramyeon (Korean instant noodles). On the other hand, jjajangmyeon (noodles in black bean sauce), which many people with diabetes call a “blood sugar bomb,” did not raise my blood sugar as much as I expected. Little by little, I am building my own list of meals my body handles well.

Seeing real numbers after each meal changed how I felt about food. Instead of following general “good” and “bad” food lists, I could see how my body responded. I think this is the greatest gift a CGM can offer: it turns vague worry into clear, personal information.

3. Type 2 diabetes remission: what “escaping diabetes” really means

In medicine, the word “cure” is not used for type 2 diabetes. Instead, doctors use remission. An expert group convened by the American Diabetes Association defines it as an A1C (HbA1c) below 6.5% (48 mmol/mol) measured at least 3 months after stopping all glucose-lowering medication. Remission means blood sugar is in a healthy range, but diabetes can return if the old habits come back.

Personally, I like to call my goal “escaping diabetes.” Watching how my body responded on the CGM, I saw a real possibility of moving away from diabetes. Research supports this hope for some people: in the UK DiRECT trial, almost half of participants with type 2 diabetes reached remission after one year of a structured weight-loss program. Still, this is my personal view, and it cannot be generalized. Everyone’s blood sugar responds differently.

My own numbers: my A1C was 13% at diagnosis and has come down to 5.7% (6.4% → 5.9% → 5.7%). I currently take a combination of saxagliptin and metformin, and my doctor and I have agreed to consider stopping it if my next blood test shows 5.6% or lower. That decision will be made together with my doctor, not on my own.

4. Three lessons from my continuous glucose monitor

Lesson 1: Keep carbohydrates low

The more I studied diabetes, the more I realized that for my body, too much sugar was a much bigger problem than too little. When I kept carbohydrates to a minimum, my blood sugar barely rose, and the CGM showed this clearly meal after meal.

Research supports this approach. The ADA’s 2019 nutrition consensus report noted that reducing overall carbohydrate intake has the most evidence for improving blood sugar in people with diabetes. If you are interested, I have written more about my approach to a low carb diet for diabetes. Changing the order of foods, such as eating vegetables first, also helped soften my spikes.

Lesson 2: Move after meals

It is often said that diabetes care is about 80% diet and 20% exercise. From my experience, I would gently suggest that exercise deserves more weight, perhaps 60:40 or even 50:50. Especially after a higher-carb meal, moving afterward clearly reduced the rise in my blood sugar. On days I exercised well, managing blood sugar for the rest of the day also felt easier.

Studies agree. A 2022 meta-analysis found that breaking up sitting with light walking lowered after-meal blood sugar and insulin compared with staying seated, and walking worked better than simply standing. For me, this has become running three times a week and cycling to work, but a 10-minute walk after dinner is a wonderful place to start.

Lesson 3: Drink less alcohol, or none

This was the biggest surprise. I had assumed alcohol did not raise blood sugar much, so I underestimated it. My CGM showed that drinking did not raise my blood sugar right away, but it kept it elevated for a long time. On drinking days, I often saw high blood sugar above 200 mg/dL (11.1 mmol/L) during sleep, and the next day’s after-meal numbers were harder to control. I had always thought ramyeon with gimbap (seaweed rice rolls) was my worst combination, but for me, alcohol turned out to be even harder on blood sugar.

Please note that alcohol affects people differently. For those taking insulin or sulfonylureas, alcohol can also cause low blood sugar (hypoglycemia), especially overnight. This is something to discuss with your doctor.

5. Tips if you would like to try a CGM

• Talk to your doctor first. They can help you choose a device and understand your readings. Coverage and availability differ by country and insurance plan.
• Keep a simple food and activity log next to the CGM data. Numbers mean much more when you know what you ate and did.
• Test your own “usual” meals, not just special ones. Your everyday lunch matters most.
• Be curious, not fearful. A spike is information, not a failure. Please don’t be too hard on yourself.
• Remember that sensor readings can differ from a finger-stick test, especially when glucose is changing fast. If a reading does not match how you feel, check with a meter.

Frequently asked questions

Is a CGM useful for type 2 diabetes without insulin?

For me, it was very useful. Even without insulin, a CGM shows how specific foods, activity, sleep, and alcohol affect your blood sugar, which can help you and your doctor make better choices together.

Can you buy a CGM for type 2 diabetes over the counter?

In the U.S., some CGMs are now sold over the counter for adults who do not use insulin. Prescription devices may be covered by insurance in some cases. Availability differs by country, so please ask your doctor or pharmacist what is right for you.

Can type 2 diabetes go into remission?

Yes, for some people. Remission is usually defined as an A1C below 6.5% (48 mmol/mol) for at least 3 months without diabetes medication. Weight loss is the strongest known factor, and remission needs ongoing habits to last.

How does alcohol affect blood sugar on a CGM?

It differs from person to person. In my case, blood sugar did not jump right after drinking, but stayed high overnight and made the next day harder. For people on insulin or sulfonylureas, alcohol can instead cause low blood sugar, so please ask your doctor about safe limits.

Escaping diabetes is possible, but not easy

Cutting back on alcohol, keeping carbohydrates low, and moving after meals: for me, the path is simple and clear. Living it every day is the hard part. Each day I have to face the urge to drink and the wish to just rest. That struggle is actually one of the reasons I started this blog; writing helps me keep my promise to myself.

I now think of my type 2 diabetes as a warning light I am grateful for. It pushed me to understand my own metabolism, and the same habits that help blood sugar may also help lower the risk of high blood pressure, high cholesterol, heart disease, and dementia. If you are at the prediabetes stage, my article on prediabetes weight loss explains why I wish I had started even earlier. I hope you can find your own pattern, too, and live with confidence. The safest path is always the one you plan with your doctor.

Thank you for reading, and I truly wish you good health.

References (PubMed)
· Riddle MC et al. Consensus Report: Definition and Interpretation of Remission in Type 2 Diabetes. Diabetes Care 2021;44(10):2438-44. doi:10.2337/dci21-0034
· Lean MEJ et al. Primary care-led weight management for remission of type 2 diabetes (DiRECT): an open-label, cluster-randomised trial. Lancet 2018;391(10120):541-551. doi:10.1016/S0140-6736(17)33102-1
· Evert AB et al. Nutrition Therapy for Adults With Diabetes or Prediabetes: A Consensus Report. Diabetes Care 2019;42(5):731-754. doi:10.2337/dci19-0014
· Buffey AJ et al. The Acute Effects of Interrupting Prolonged Sitting Time in Adults with Standing and Light-Intensity Walking on Biomarkers of Cardiometabolic Health in Adults: A Systematic Review and Meta-analysis. Sports Med 2022;52(8):1765-1787. doi:10.1007/s40279-022-01649-4