Apple’s Watch is capable of monitoring sleep, steps, heartrate and oxygen. But why can’t it measure blood sugar? There have been years of reports of big tech companies trying to breakthrough into accessible noninvasive glucose monitoring, so what’s stopping it from being a reality?

I dig into Apple’s secrets, decode its patents and talk to some leaders in health tech to see whether measuring blood sugar above the skin could become a reality.

0:00 Checking blood glucose
0:46 Noninvasive glucose monitoring
1:56 Technological and regulatory challenges
3:20 Apple’s patents and research

I’m Dalvin Brown, a WSJ reporter covering personal technology, which includes the latest smart devices, apps and services making an impact on consumers. Subscribe if you're curious about what the latest tech developments mean for you, or if you want to go behind the scenes to find out what’s powering today's digital services.

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