What is a CGM and do I need one?

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A continuous glucose monitor is a small sensor worn on the arm or abdomen that reads glucose in the tissue fluid every few minutes around the clock, streaming to your phone - replacing finger-stick snapshots with a movie. NIDDK describes CGMs as standard tools in modern diabetes care, and for some groups they are genuinely transformative: people on insulin, where real-time readings and alarms prevent dangerous lows - the strongest indication, often covered by insurance; people with type 1 diabetes universally; and people with type 2 whose control is erratic or whose A1c disagrees with their finger-sticks.

The honest case for everyone else: for type 2 managed on diet or metformin alone, a CGM is optional - useful for a few weeks of learning how your body responds to specific foods, meals, sleep, and exercise, then often done. For people without diabetes, consumer CGM use is a trend with thin evidence - watching normal glucose wiggle after meals teaches little, and it can fuel food anxiety in the anxious.

Practical notes: readings lag blood glucose by about 10 to 15 minutes, sensors run 10 to 14 days each, compression lows - false low alarms from sleeping on the sensor - are a known quirk, and finger-stick confirmation still applies when a reading does not match how you feel. Insurance coverage follows the insulin indication most reliably.

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What is a CGM and do I need one?

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