If you were interested in receiving a seemingly endless stream of data about your bodily functions, it used to be enough to buy an Oura ring. Now, wellness obsessives are tracking their blood sugar around the clock, too. While continuous glucose monitors (CGMs) were initially intended to help people with diabetes manage their blood sugar, they’re now available over-the-counter for anyone curious about how their body is responding to their breakfast. My Instagram feed is full of ads for direct-to-consumer CGMs from brands like Lingo and Stelo . Gwyneth Paltrow recently filmed herself wearing one while making grain-free pancakes.

Proponents of CGMs will tell you that the main reason to wear one is to avoid “blood sugar spikes.” The influencer Jessie Inchauspé — known online as Gl

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