https://wccftech.com/apple-supplier-reveals-non-invasive-blood-glucose-monitor-for-future-apple-watch-models/

Apple has been gradually beefing up the Apple Watch with new sensors that boast enhanced health-related features. An Apple supplier Rockley Photonics has developed new sensors for smartwatches that could potentially make their way to the Apple Watch. These new digital sensors include a non-invasive blood glucose monitor, core body temperature, and more. As mentioned earlier, these sensors could come to future Apple Watch models.

We have been hearing for some time that Apple is working to board glucose monitoring on the Apple Watch. According to reports, Apple could not integrate the sensors that were said to be coming with the Apple Watch Series 7. However, since glucose monitoring is an important health metric, Apple will integrate the sensors sometime in the near future (via MacRumors).