CGMs study individual meal responses
- Diabetes In Control reported on May 21 that researchers are using continuous glucose monitors to study why people show different glucose responses to similar meals. - A 2015 Cell study tracked 800 people across 46,898 meals and found “high variability” in post-meal glucose responses to identical foods. - A 2025 Nature Medicine study examined carbohydrate responses and mitigators, with insulin resistance and insulin secretion among the factors studied.
Continuous glucose monitors are being used in research well beyond insulin dosing. Scientists have used the devices to track why one person’s blood sugar may rise sharply after a meal that produces a smaller response in someone else, a line of work that has moved CGMs into studies of diet, metabolism and diabetes risk. Diabetes In Control said on May 21 that the devices are being framed increasingly as behavior and risk tools, not only as equipment for people already using insulin. A 2015 study in *Cell* helped establish that pattern. Researchers led by Eran Segal and Eran Elinav at the Weizmann Institute continuously monitored glucose in 800 people for a week, recorded 46,898 meals, and reported “high variability in the response to identical meals.” The paper said personalized diets guided by those data lowered post-meal glucose responses in a follow-up intervention. ### Why can the same meal produce different glucose spikes? (diabetesincontrol.com) The *Cell* study said postprandial glycemic responses differed widely even when participants ate the same foods. The researchers built a prediction model using clinical measures, diet, physical activity and gut microbiota, arguing that a person’s metabolic context matters as much as the carbohydrate count on the plate. A 2025 *Nature Medicine* paper pushed that work further with “deep phenotyping” of carbohydrate meals and so-called mitigators. (cell.com) The study reported that interindividual differences in postprandial glycemic responses reflected underlying metabolic physiology, including insulin resistance and insulin secretion. ### What are researchers trying to learn from repeated post-meal spikes? Stanford researchers reported in 2018 that some people without diabetes showed glucose spikes in ranges usually associated with diabetes. (cell.com) Michael Snyder, a Stanford genetics professor and senior author, said prolonged high blood sugar could contribute to cardiovascular disease risk and to insulin resistance, which is a precursor to diabetes. (nature.com) A 2023 review in *Metabolism* said interest in CGM use among people without diabetes has grown because the devices make post-meal patterns visible. The review said post-prandial hyperglycemia in people without diabetes is being studied for its role in metabolic health, while noting that interpretation remains a developing area. ### Are CGMs now being used in people without diabetes? (med.stanford.edu) Diabetes In Control said the expansion of wearable metabolic monitoring has raised interest in early detection and prevention, alongside concerns about over-medicalization and health anxiety. The article described CGMs as part of a broader shift in prevention technology. A review in *Metabolism* said CGMs have become a common adjunct in diabetes care and are now being used by people without diabetes to examine how meals and lifestyle affect glucose. (metabolismjournal.com) The authors said the visibility of glucose data has made it easier for users to study post-prandial changes in real time. ### How stable are these meal-response patterns? An *American Journal of Clinical Nutrition* paper on intraindividual variability raised a caution. (diabetesincontrol.com) The authors said CGMs are being used to provide personalized dietary advice, but added that the value of that advice depends on glucose responses being reliable within the same person over time. A 2023 study in *Nutrients* also used CGM data to examine individual postprandial responses to meal types with different carbohydrate levels in young adults. (metabolismjournal.com) The researchers linked those responses with 14-day glycemic variability, adding more evidence that meal effects can differ across individuals and across days. ### What comes next in this research? ADA 2026 coverage cited by Diabetes In Control’s broader reporting has flagged glucose monitors as one of the subjects drawing attention this year. (ajcn.nutrition.org) The next step in this field is likely to come from cohort studies and intervention trials testing whether identifying and reducing repeated spikes changes longer-term outcomes in named groups of participants. (diabetesincontrol.com) (mdpi.com)
