From Medical Device to Wellness Gadget
Continuous glucose monitors (CGMs) — small sensors that measure interstitial glucose every few minutes — revolutionized type 1 diabetes management and are now available over the counter and marketed to metabolically healthy people seeking to optimize diet and performance. The premise is that seeing real-time glucose responses to meals empowers better food choices. This has spawned an entire wellness industry, but the evidence that CGM improves outcomes in non-diabetics is far thinner than the marketing suggests.
What Glucose Data Can and Cannot Tell You
In people without diabetes, blood glucose is tightly regulated and post-meal spikes are a normal physiological response, not a pathology to be eliminated. Glucose responses vary enormously between individuals eating identical foods — the influential PREDICT studies showed personalized responses shaped by microbiome, sleep, and genetics. While this personalization is scientifically fascinating, no randomized trial has yet demonstrated that CGM-guided eating improves hard health outcomes in healthy people. Much of the interpreted meaning attached to modest glucose fluctuations lacks clinical grounding.
A Balanced Verdict
CGMs can offer genuine educational value — revealing how specific foods, stress, and exercise affect an individual — and may motivate healthier behavior. But for metabolically healthy people, they also risk fostering anxiety, disordered eating, and overinterpretation of normal variation. They are most clearly beneficial for people with prediabetes, gestational diabetes, or diabetes. The wellness use case remains promising but unproven. Facilities managing glucose monitoring for patients can source diagnostic equipment and blood glucose supplies from our catalog.
