Continuous glucose monitors are small sensors worn on the skin that track blood sugar in real time. They've moved well beyond diabetes management into general wellness marketing, often bundled with gut health apps that connect blood sugar spikes to specific foods. A 2026 narrative review published in JAMA Internal Medicine looked specifically at whether this makes sense for people without diabetes.
The review's conclusion was direct: there is no scientific evidence that continuous glucose monitoring improves health or prevents disease in people who don't have diabetes.[1] One of the researchers specifically called for companies selling these devices to be more transparent that this evidence gap exists, rather than implying a proven health benefit.
The review also flagged a real downside: blood glucose naturally fluctuates throughout a healthy person's day, and normal fluctuations can be misread as problems. That can lead to unnecessary dietary restriction and increased anxiety around eating, exactly the kind of over-tracking spiral that undermines a relaxed relationship with food.
What to do with this
If you don't have diabetes or prediabetes, the current evidence doesn't support continuous glucose monitoring as a tool that will meaningfully improve your health, despite the marketing built around it. If you're curious how specific foods affect you, a short, defined trial period, two to four weeks, with a clear question you're trying to answer, such as whether a post-meal walk blunts a spike or whether late-night snacking shows up differently, is more contained than open-ended monitoring. If a CGM is making you more anxious about normal blood sugar fluctuations rather than more informed, that's a sign to stop, not a sign to analyze the data more closely.
