I am not diabetic nor do I have any out-of-normal blood chemistry (no high cholesterol, etc.), and exercise frequently.
But I *am* overweight, and not by a little.
A few weeks ago I started a strict ketogenic diet. In support of this, I started using a continuous glucose monitor that provides a reading every 15 minutes.
This is a complete game changer!
The ability to see how food, sleep, stress, alcohol, and workouts all affect blood sugar levels makes fine tuning one's diet and daily activities very easy.
It's not just for diabetics (except in the eyes of health insurers, who don't cover it otherwise.)