In its most recent report, the The Telegraph stated that the Apple Watch 8 is about to gain a big hardware upgrade. It will likely be able to measure your glucose and alcohol levels as well as your blood pressure.
The publication found some solid evidence in SEC (the US Securities and Exchange Commission) that Apple uses Rockley Photonics as its main supplier for health-tracking sensors. And the CEO of the said company has talked about these sensors in the past, indicating that consumer-ready products will start to pop up in 2022.
This, in turn, coincides with the Apple Watch Series 8 release, so it's not too far-fetched to see the 8th generation measuring blood sugar, blood pressure and alcohol levels. However, that doesn't mean that all three sensor will make it to Apple's watch but it seems quite possible for now.
Read some where that they use Raman effect to do this... It is not invasive.. I pray it should be successful if it is successful, it would atleast relieve daily pricking.
It's new technology that doesn't need to test blood directly butrather through another medium like Radio frequency. Look it up, there is documentation about the new but untested technology