Standing in my bathroom, staring at the needle poking out of a continuous glucose monitor (CGM), I started having second thoughts. CGMs measure glucose levels in interstitial fluid — the fluid between your cells. Unlike traditional fingerprick tests, they can give you real-time data about your blood sugar levels, and they’re typically used by people with Type 1 diabetes to manage their condition. But Nutrisense and other companies like Levels and January are proposing that nondiabetics can use