Continuous glucose monitor (CGM)

A continuous glucose monitor (CGM) is a wearable sensor that tracks your blood sugar around the clock. It usually sits just under your skin and reads interstitial glucose every few minutes. Most stick-on sensors last about 7 to 14 days (it depends on the system), while implantable ones like Eversense 365 can last up to a year. A CGM gives you trend data: fasting, after-meal, and overnight glucose, plus 'time in range' and how much your glucose swings. More and more non-diabetic adults use them to personalize their nutrition and fine-tune longevity-minded lifestyle choices.

Last reviewed: June 22, 2026

This definition is educational and is not medical advice, a diagnosis, or treatment. Talk to a doctor about any health decisions. Read our full medical disclaimer