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A continuous glucose monitor (CGM) measures blood sugar in interstitial fluid every 5 minutes over 14 days. For people with diabetes it is a covered benefit. For everyone else — longevity-oriented users, athletes, people with unexplained energy dips — CGMs have long been hard to access. SIBIONICS is one of the few vendors that sells the GS1 sensor without a prescription to out-of-pocket buyers in Germany. Legally it is a medical device for self-application, but the device is explicitly not a substitute for diagnosis or therapy.

In a self-test across three sensor cycles (42 days) the deviation against a parallel reference (Contour Next One, fingerstick, morning fasted) averaged +6 mg/dL — a lag typical for CGM systems due to interstitial measurement. For the purpose "spot which meal produces which curve" that is more than enough. For hard medical decisions (insulin dosing) it is not.

The most useful insight from 42 days of CGM without diabetes was not the single spike but the time-in-range (70–140 mg/dL). Cereal in the morning without protein reproducibly produced spikes above 160 mg/dL with a reactive low after 90 minutes — subjectively the classic "11 am dip". The same calorie amount as scrambled eggs with berries stayed under 130. An espresso after breakfast measurably smoothed the curve. These everyday patterns are practically invisible without continuous glucose monitoring.