Gram Research analysis of 318 U.S. adults with type 2 diabetes not using insulin found that one year of Dexcom G7 continuous glucose monitor use was linked to an average HbA1c drop of 0.66%. Participants also showed gains in weight, diet, and diabetes-related stress. Because the study was observational, it shows association, not proof of cause.
A new study from Gram Research analysis followed 318 adults with type 2 diabetes who do not use insulin. These adults wore a Dexcom G7 continuous glucose monitor, a small sensor worn on the arm or belly that tracks blood sugar all day, while continuing their regular care at 10 primary care clinics in the United States. After one year, their average HbA1c, a three-month measure of blood sugar control, dropped by 0.66 percentage points. Participants also showed small improvements in weight, eating habits, and stress about living with diabetes. The study did not include a control group that went without the device, so it cannot prove the monitor caused these changes. Still, the results suggest that glucose monitors may be useful for people with type 2 diabetes who take pills or make lifestyle changes rather than using insulin.
Key Statistics
A 2026 cohort study of 318 adults with non-insulin-treated type 2 diabetes in U.S. primary care found that average HbA1c dropped by 0.66% after 12 months of Dexcom G7 continuous glucose monitor use.
In the same one-year real-world study, diabetes-related distress scores fell from 2.2 to 1.8 on a standard scale among participants using a Dexcom G7 monitor.
Participants in a 2026 registry study of 10 U.S. primary care sites had an average age of 61 and an average body mass index of 31 kg/m2 at the start of continuous glucose monitor use.
The Quick Take
- What they studied: Researchers wanted to know whether wearing a continuous glucose monitor for a year helps adults with type 2 diabetes who do not take insulin improve their blood sugar, weight, diet, and stress levels.
- Who participated: The study included 318 adults with type 2 diabetes who do not use insulin, recruited from 10 primary care clinics in the United States. The average age was 61, about 54% were men, about 40% were not white, and average body mass index was in the obese range. About 39% had a low income.
- Key finding: Average HbA1c fell by 0.66 percentage points over one year. This is a meaningful drop, since even small changes in HbA1c are linked to lower risk of diabetes complications. Diabetes-related distress scores also improved, falling from 2.2 to 1.8 on a standard scale, a change that was statistically strong.
- What it means for you: If you have type 2 diabetes and do not use insulin, a glucose monitor may help you see how food, activity, and sleep affect your blood sugar. Talk with your doctor before starting one, since the study was observational and results may differ for you.
The Research Details
This was a real-world registry study, meaning researchers tracked people in everyday clinical settings rather than controlling every part of their lives. Adults with type 2 diabetes who were not on insulin started using a Dexcom G7 continuous glucose monitor while continuing their usual medical care. The sensor records glucose levels throughout the day and night, and the device can share readings with a phone.
Over 12 months, researchers measured HbA1c, weight, body mass index, and self-reported measures of stress, diet, and daily habits. Participants were followed from the start of the study to the one-year mark, so changes could be compared over time. The study was registered publicly under the identifier NCT06483945, which helps show the study plan was recorded before the results were collected.
Because the study had no separate group that did not wear the monitor, it is difficult to know how much of the improvement came from the device itself and how much came from the attention and coaching that come with joining a study. Researchers therefore describe the findings as associations rather than proof of cause.
Watching real people in primary care clinics shows how a tool performs in the messy conditions of everyday life. This kind of evidence helps doctors and patients understand what to expect outside of tightly controlled trials. The study also looked at people who do not use insulin, a group that has been studied less often for glucose monitoring than insulin users.
The study was registered in advance and included a large number of participants for this type of research. It followed people for a full year and measured several outcomes, including a standard blood test for blood sugar control. However, it had no control group, did not randomly assign people to wear the monitor, and relied partly on self-reported habits, which can be less precise than lab measurements. Readers should view the results as encouraging but not conclusive.
What the Results Show
The main result was a drop in HbA1c, a blood test that reflects average blood sugar over about three months. Participants lowered their HbA1c by an average of 0.66 percentage points after 12 months. The range of likely values in the study was from about 0.49 to 0.83 points, which means the improvement was consistent across the group rather than driven by a few people.
An HbA1c drop of this size is considered clinically meaningful for people with type 2 diabetes. Health guidelines commonly treat changes of this size as important because lower blood sugar over time is linked to lower risk of eye, kidney, and nerve problems. The result is in line with what doctors often hope to see from new diabetes tools.
The study also suggests that the monitor may have supported healthier daily choices. Participants reported changes in their diet and other lifestyle habits over the year, which could help explain the improvement in blood sugar. However, the study did not measure each habit in precise detail, so the exact contribution of each change is not clear.
Participants showed modest improvements in weight and body mass index over the year. Diabetes-related distress, the emotional burden of managing a long-term condition, also decreased, with scores falling from 2.2 to 1.8 on a standard scale. This suggests that seeing glucose readings may give some people a sense of control, though it may also cause worry for others. Researchers reported that dietary patterns and other lifestyle behaviors improved as well.
Most earlier studies of continuous glucose monitors focused on people who take insulin, because they are the group most likely to be given these devices. Evidence for people with type 2 diabetes who do not use insulin has been more limited. This study adds real-world data from primary care, which supports the idea that these tools may help a wider range of patients. Its results fit with the broader trend of using technology to help people manage blood sugar through daily feedback.
The study did not compare participants to a group that went without a monitor, so it cannot prove the device caused the improvements. Participants may have been more motivated than average, and the attention from study staff could have influenced their behavior. Many outcomes, such as diet and stress, were based on self-reports, which can be affected by memory and personal bias. The group was mostly from U.S. primary care clinics, so the results may not apply to other countries or health systems. Some information about weight changes was not fully reported in the summary, so readers should interpret those details with caution.
The Bottom Line
Research suggests that continuous glucose monitors may help adults with type 2 diabetes who do not use insulin lower their HbA1c and make healthier choices. Confidence in this finding is moderate, because the study was large and followed people for a year, but it did not use a control group. Doctors may consider monitors as one tool among diet, activity, and medication, with regular checkups to track progress.
Adults with type 2 diabetes who do not take insulin, and their doctors, should pay attention to these findings. People without diabetes, or those who use insulin, may find the results less directly relevant, although the general idea of tracking glucose may still interest them. Anyone considering a monitor should talk with a healthcare provider about whether it fits their needs, costs, and health goals.
In this study, changes in HbA1c and habits were measured over 12 months, so meaningful results appear to take about a year. Some people may notice useful patterns in their glucose readings within the first few weeks, such as how meals or walks affect their levels. Lasting changes usually take consistent effort over several months.
Frequently Asked Questions
Can a continuous glucose monitor help lower blood sugar in type 2 diabetes without insulin?
A one-year study of 318 adults found that using a Dexcom G7 monitor was linked to an average HbA1c drop of 0.66%. Participants also reported better diet and lower diabetes-related stress. The study was observational, so it shows an association rather than proof that the monitor caused the change.
How much does HbA1c need to drop to matter for type 2 diabetes?
Even modest HbA1c reductions can be meaningful for people with type 2 diabetes because lower average blood sugar is linked to reduced risk of complications. In one 2026 study, participants averaged a 0.66 percentage point drop over a year. Always discuss your personal targets with your doctor.
Are glucose monitors only for people who take insulin?
Most past research on glucose monitors focused on people using insulin. A 2026 registry study of adults with type 2 diabetes who do not use insulin suggests monitors may also be useful for this group. Anyone considering a monitor should speak with a healthcare provider about whether it suits their situation.
Does wearing a glucose monitor help with diet and stress for diabetes?
In a one-year real-world study, participants wearing a Dexcom G7 monitor showed improvements in dietary patterns, lifestyle behaviors, and diabetes distress. Distress scores fell from 2.2 to 1.8. Researchers noted that these gains were observed rather than proven to result from the device alone.
Want to Apply This Research?
- Log your average daily glucose from the monitor each week and record how many days you stayed within your target range. Also track your weight once a week and note any meals or activities that caused your readings to spike.
- Use the app to spot one pattern each week, such as a high reading after a particular meal, and try one small change, like a short walk after eating. Review the results with your care team at your next visit.
- Review your HbA1c results with your doctor every three months and compare them with your monitor data over time. Keep a monthly summary of weight, eating habits, and stress levels so you can see long-term trends and share them at checkups.
This article summarizes a single observational study and is for general education only. It is not medical advice. The study did not include a control group, so it cannot prove that a glucose monitor caused the results described. Anyone with type 2 diabetes should talk with a doctor or diabetes care team before starting, stopping, or changing any monitoring, medication, diet, or exercise plan.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.