Evidence explainerMetabolic Health & Blood Sugar
Do You Need a Continuous Glucose Monitor Without Diabetes? What the FDA Cleared and What Studies Show
Over-the-counter glucose monitors are FDA-cleared for adults not on insulin. A 2026 systematic review found they may nudge some diet changes as part of structured programs, but stand-alone benefit is not established.
Key takeaways
- Dexcom Stelo, cleared March 5, 2024, is for adults 18+ not on insulin, shows readings every 15 minutes, and each sensor lasts up to 15 days [1].
- It is not for people with problematic hypoglycemia, because it does not alert to low blood sugar [1].
- A 2026 systematic review of 12 studies in adults without diabetes found CGM plus diet education cut carbohydrate intake by 15 g in one 8-week trial, but certainty was low [2].
- Physical activity did not clearly change, and evidence on psychological effects was insufficient to show benefit or rule out harm [2].
What the FDA cleared
The FDA cleared Stelo as the first over-the-counter CGM, intended for people with diabetes on oral medicines and for people without diabetes who want to see how diet and exercise affect glucose [1]. Reported adverse events in its study included local infection, skin irritation and discomfort [1].
The FDA says users should not make medical decisions from the readings without talking to a health care provider [1].
What studies in people without diabetes show
The 2026 review found 12 eligible studies but could not pool them [2]. In one 8-week randomized trial, CGM plus low-glycemic education reduced carbohydrate intake (-15.2 g), glycemic index and glycemic load more than education alone [2].
Activity showed no clear difference, certainty was low for diet outcomes and very low for the rest, and the authors concluded large, durable or stand-alone benefits are not established [2].
Who might get value
A CGM can work as biofeedback inside a structured eating or lifestyle plan [2]. If your concern is prediabetes, the intervention with the strongest evidence is a lifestyle program [3]; see our prediabetes guide.
Quick answers
Can a CGM diagnose diabetes?
No. Diagnosis uses lab tests ordered by a clinician, and the FDA says not to make medical decisions from an over-the-counter CGM without one [1].
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References
- [1]FDA Clears First Over-the-Counter Continuous Glucose Monitor. U.S. Food and Drug Administration, 2024.
- [2]Behavioral and Psychosocial Effects of Participant-Visible Continuous Glucose Monitoring in Adults Without Diabetes: A Systematic Review. Medicina (Kaunas), 2026.
- [3]Reduction in the incidence of type 2 diabetes with lifestyle intervention or metformin. N Engl J Med, 2002.