I have rarely, if ever, thought about my blood sugar. I think about sugar on occasion — the dentist demands it, and I get a headache when I eat an entire bag of Haribo dinosaur gummies.

But a new spate of startups wants me, and everyone, to start thinking about our blood sugar all the time. Over the past few years, companies like Levels, January, and Nutrisense started selling programs that promise to help people start managing their blood sugar levels. They sell devices called continuous glucose monitors: small sensors that embed a tiny needle in someone’s body to track the way their blood sugar (their glucose) levels rise and fall.

Continuous glucose monitors (CGMs) are usually used by people with Type 1 diabetes, a chronic condition…

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