Should I use a CGM if I'm not diabetic and not pre-diabetic?

Yes, with appropriate expectations. The behavioral feedback value is real and documented: knowing that your oatmeal drives you to 175 mg/dL while eggs and avocado barely move you changes what you eat for the rest of your life. The data from Levels Health's population showed consistent dietary changes in users following CGM-guided insights, with downstream improvements in triglycerides and fasting insulin. Behavioral change at this scale in healthy men is not trivial.

What the CGM will not do is tell you your cardiovascular risk. It is a metabolic tool, not a cardiovascular screening tool in the sense that a CAC score is. The man who uses a CGM as his primary health monitoring strategy while skipping ApoB, hs-CRP, and blood pressure assessment is optimizing one signal while the primary predictors of cardiac events go unchecked. The CGM belongs in a complete picture; it does not replace the rest of the picture. (Continuous Glucose Monitor use in non-diabetic adults, systematic review, Diabetes Technology and Therapeutics, 2020)

Cardiologist's calibrated position, Promising (2) for non-diabetic CGM use. The behavioral change data is real. The long-term cardiovascular outcome evidence is not yet available from RCTs.

What to do: Use CGM for 14–30 days to identify your personal glycemic responders, then reassess whether continuous monitoring adds new information. Add ApoB, Lp(a), and hs-CRP to your lab panel while the CGM is running.

For the full picture, read The CGM on Your Arm Doesn't Know Your Arteries.