Continuous glucose monitors (CGMs) measure blood sugar every few minutes and were once prescription-only but are now available over the counter for about $50.
The sensor is applied using a spring-loaded applicator, takes readings every 5 minutes (transmits every 15), and sticks to the upper arm with adhesive.
The companion app follows strict regulatory guidance, and for iOS can connect to Apple Health, which allows exporting data to XML/CSV.
Practical takeaways include recognizing surprising blood sugar spikes from certain meals and the strong effect of even brisk walks on lowering glucose.
Gamification and self-monitoring can motivate healthier habits by making users more aware of blood sugar changes.
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