https://www.cnbc.com/2017/12/27/apple-watch-health-features-reveal-new-frontier-for-wearables.html

In the last months of Steve Jobs's life, the Apple co-founder fought cancer while managing diabetes.

Because he hated pricking his finger to draw blood, Mr. Jobs authorized an Apple research team to develop a noninvasive glucose reader with technology that could potentially be incorporated into a wristwatch, according to people familiar with the events, who asked not to be identified because they were not authorized to speak on behalf of the company.