Research reviewed by Gram suggests that continuous glucose monitors are not yet proven useful for healthy people trying to improve their diet. An expert workshop held in May 2025 found that blood sugar responses to the same meal differ widely between individuals, but too little evidence links monitor readings to long-term health. Experts advise using them outside diabetes care only within research or with professional guidance.
Continuous glucose monitors, small sensors that track blood sugar throughout the day, are increasingly marketed to people without diabetes who want to eat better. According to research reviewed by Gram, a panel of nutrition experts met in May 2025 to examine whether this practice is supported by evidence. They found that blood sugar responses to meals vary widely from person to person, and that monitors can reveal these differences in everyday life. However, the experts also noted that the devices can be imprecise when judging a single meal, that testing methods are not yet standardized, and that there is little proof linking monitor readings to long-term health outcomes. Their conclusion is cautious: until stronger studies are completed, using these monitors outside diabetes care should happen within research studies or with guidance from a health professional. The paper was published in Advances in Nutrition in November 2026.
Key Statistics
A 2026 perspective paper in Advances in Nutrition, based on a May 2025 expert workshop convened by the Institute for the Advancement of Food and Nutrition Sciences, concluded that continuous glucose monitor use in people without diabetes should be approached cautiously.
The 2026 expert review found that blood sugar responses to meals vary substantially between individuals because of diet, lifestyle, and physiology, yet there is insufficient evidence linking monitor-derived measurements to long-term clinical outcomes.
The Quick Take
- What they studied: Whether wearing a continuous glucose monitor, a sensor that tracks blood sugar over time, is useful and safe for people who do not have diabetes, and what scientists still need to learn before recommending it.
- Who participated: This is an expert perspective paper, not a study with patients. A group of nutrition scientists, clinicians, and researchers from different fields took part in a workshop in May 2025. The number of participants was not reported, and no new people were tested.
- Key finding: Blood sugar responses to the same food differ widely between individuals, and these differences are shaped by diet, daily habits, and body traits. The experts found that there is not yet enough high-quality evidence showing that monitor readings lead to better long-term health for people without diabetes.
- What it means for you: If you do not have diabetes, a glucose monitor is not yet proven to improve your health or diet. If you are curious, consider using one through a research study or with a doctor or registered dietitian who can explain what the readings do and do not mean.
The Research Details
This paper is a perspective piece, meaning it summarizes expert discussion and existing knowledge rather than testing people directly. The Institute for the Advancement of Food and Nutrition Sciences organized a workshop in May 2025 that brought together experts from several disciplines. They discussed how normal blood sugar works, what affects blood sugar after eating, how monitors are used, and what this means for doctors and researchers.
The experts’ goal was to pull together current evidence and point out where it is strong and where it is weak. They looked at practical issues, such as whether monitors give consistent results, and scientific issues, such as whether there are agreed-upon ways to run studies. The result is a set of considerations meant to guide future research, clinical decisions, and policy.
Because the paper synthesizes expert opinion and prior work, its conclusions reflect the judgment of the panel. It is not a single experiment with a fixed group of participants, so readers should treat it as a guide to what is known and unknown rather than as proof that monitors work or fail.
Bringing experts together to review the evidence is useful when the science is new and fast-moving. Consumer glucose monitors are being sold to healthy people faster than research can keep up, so a careful review can separate promising ideas from claims that have not been tested.
This approach also highlights methods problems. When experts point out that protocols are not standardized, they are explaining why results from different studies may not be comparable. That helps readers understand why one study might show a benefit while another does not.
The paper was published in a peer-reviewed nutrition journal, which means it went through editorial review. Its authors come from a respected scientific organization and drew on a range of disciplines. However, it is an opinion-based synthesis rather than an original experiment, so it does not provide new numbers on how well monitors work.
The study type listed in the submitted information says randomized controlled trial, but the paper itself is a perspective from an expert workshop. Readers should not assume it contains trial results. Its strength lies in clearly stating what is still missing from the research.
What the Results Show
The most consistent message from the workshop is that people respond to food in very different ways. Two people can eat the same meal and see different rises in blood sugar. The experts explained that this variability comes from a mix of factors, including what is on the plate, how much someone moves, sleep, stress, and individual body chemistry.
Continuous monitors can capture these changes as they happen in daily life, which is one reason researchers find them interesting. Blood sugar responses after eating are increasingly viewed as possible early signals of problems with how the body handles sugar. This is why the technology has drawn attention beyond diabetes care.
Despite this promise, the experts stressed clear limits. Monitors may not be precise enough to judge a single meal or a short-term moment, and readings can vary due to the device and how it is analyzed. Interpreting one spike or dip without context may give a misleading picture of overall health.
The panel also found that there is not enough evidence connecting monitor-based measurements to long-term outcomes like heart disease or diabetes risk. Until that link is established through strong studies, the experts recommend treating monitor data as a source of curiosity and learning, not a basis for medical decisions.
The experts called for several improvements in future research. These include well-designed randomized controlled trials, which compare people who receive an intervention with those who do not, along with standard testing protocols that allow results to be compared across studies. They also asked for shared guidance that researchers and clinicians can follow.
The paper points out that blood sugar is only one part of metabolic health. Experts suggested that future work should look at how blood sugar connects with other body systems, such as fat storage, blood pressure, and cholesterol, rather than treating glucose as a standalone score.
Finally, the authors raised policy questions about how these devices are sold and explained to the public. Because people may interpret readings without training, they suggested that use outside diabetes care be supported by education and professional oversight.
This paper fits into a growing body of work showing that people without diabetes can have large differences in blood sugar responses to the same food. Earlier studies that used monitors to follow everyday eating have reported similar variation, which has encouraged interest in personalized nutrition.
At the same time, the experts’ caution reflects a broader scientific pattern: promising early observations often need larger, carefully controlled trials before they can guide advice. The workshop’s call for standardized methods responds to a known problem in nutrition research, where different studies measure things in different ways.
This paper does not present new experiments, so it cannot confirm whether monitors help or harm healthy people. Its conclusions are shaped by the judgment of the expert panel and by the evidence available at the time of the workshop. The number of participants in the workshop was not reported, which makes it hard to judge how broad the viewpoints were.
The authors themselves identify several gaps: monitor accuracy issues, a lack of standard protocols, and limited long-term data. Readers should also keep in mind that consumer products and research tools may differ, and that a paper calling for caution does not prove that all uses are harmful. It simply means the evidence is not yet strong enough to recommend them broadly.
The Bottom Line
Confidence that continuous glucose monitors are helpful for healthy people is currently low, because the expert panel found insufficient evidence linking their readings to long-term health. Using them outside diabetes care should ideally happen within structured research or with professional oversight. Confidence that blood sugar responses vary widely between individuals is high, since this is a consistent theme across the discussion.
People without diabetes who are considering a glucose monitor for diet tracking should read this paper carefully before buying one. Researchers designing nutrition studies, clinicians advising patients, and policymakers who regulate health technology will find the methodological concerns especially relevant. People with diabetes or prediabetes should follow the guidance of their own care team rather than general consumer interpretations, since this paper focuses on healthy populations.
Because the experts called for new trials, standardized methods, and long-term data, clear answers are unlikely in the short term. Researchers will need time to design and complete high-quality studies, so consumers should not expect definitive guidance on personal benefit soon. Any personal insights from a monitor are best viewed as short-term learning about your own patterns, rather than proof of long-term health gains.
Frequently Asked Questions
Should healthy people without diabetes use a continuous glucose monitor?
Experts advise caution. A 2026 review of a May 2025 expert workshop concluded that monitor use outside diabetes care should ideally happen within structured research or under professional oversight, because long-term benefits for healthy people are not yet established.
Why does the same meal raise blood sugar differently for different people?
Blood sugar responses vary because of interactions among food composition, daily lifestyle behaviors, and individual body physiology. Experts describe this individual variability as substantial, which is why one meal can affect two people very differently.
Are glucose monitors accurate enough to judge a single meal?
Experts say they are not reliably precise for single-meal assessments. The paper notes limited precision and analytical variability, so looking at patterns over days or weeks may give a more meaningful picture than one reading.
What research is needed before glucose monitors are recommended for healthy people?
Experts call for high-quality randomized controlled trials, standardized research protocols, consensus guidance, and integrated metabolic frameworks. These steps would help determine whether monitor use in healthy populations offers clinically meaningful benefits.
Want to Apply This Research?
- Log each meal along with the time, portion size, and any movement within two hours afterward, then note how you felt. Track these entries for at least two to four weeks so you can look for patterns across several days rather than judging one reading.
- Use your app to compare how different meals affect your energy and any monitor readings, then discuss the patterns with a doctor or registered dietitian before making major diet changes. Focus on steady habits like balanced meals, regular walking after eating, and consistent sleep, which are well supported by general health guidance.
- Review your logs monthly to see whether patterns repeat, and consider sharing summaries with a healthcare professional at routine visits. Revisit your approach as new research is published, since guidance in this area is expected to change as studies are completed.
This article summarizes an expert perspective paper and is provided for general education only. It is not medical advice and does not replace guidance from a qualified healthcare professional. Talk with a doctor or registered dietitian before starting a glucose monitor or making major diet changes, especially if you take medication or have a health condition.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.