This over-the-counter gadget could help the war against diabetes

As a wearables reviewer, every morning I roll over, pull out my phone, and check my sleep stats. But that’s changed in the last 14 days. Instead, I’ve been checking my glucose levels. That’s because on the underside of my left arm is a Dexcom Stelo continuous glucose monitor (CGM). Some days, I’m relieved by what I see. Other days, I wonder if I should call my doctor.

The Stelo is unique in that it’s one of three FDA-cleared…