Sorry to break the party. A buddy of mine is deeply skeptical, and he is one of the few with a decent amount of peer-reviewed publications about non-invasive blood glucose measurement. The idea to use "Radar near-field sensing" is everything but new and nothing has ever come out of it.
My buddy is one of the few guys that has a sound (no pun intended) technology that might work. But future will tell. I won't give a link. Yes, the company secured funding.
This is "my uncle who works at Nintendo said Sony sucks" level information to anyone but you.
I do agree on one part regardless of any of that though... I'm at the point of waiting for the one who actually sells me said device instead of the one that says they'll soon be able to.
At this state, they are likely able to do this. Not small enough for your watch but a working stationary device that can RELIABLY monitor your blood sugar. And with blood sugar I don't mean the skin prick test. If people claim they compared to the skin prick test and "it works" they have no idea what they are talking about. You have to compare venereal blood glucose with measured blood glucose and use the Clarke error grid to show what you are doing.
And yes, skin color or skin temperature (fever!) does not matter for his measurement. I once submitted an SBIR grant for this project, but have no involvement anymore with this project. The NIH found this approach "highly innovative" but thought it can not be realized bc the technology is "prohibitive expensive". I assume they did not really read the proposal. I explicitly wrote that, while such a device costs 50k on the market, a slimmed down version produced in quantities would cost a few hundred dollars. They just had a short look at the approach, googled the hardware behind it, and rejected it. An idiot and google is a very dangerous combination!
No, I could ask if they are able to deliver a stationary device. This would work while sleeping. But it would be very privy because it is custom-made and not delivered in quantities. And even if they can charge you 100k, they may not be willing to do that because it distracts them from their main goal. To miniaturize it and produce it in quantities.
"Breakthroughs" in this field are a dime a dozen: https://finance.yahoo.com/news/liom-cracks-holy-grail-non-22...
My buddy is one of the few guys that has a sound (no pun intended) technology that might work. But future will tell. I won't give a link. Yes, the company secured funding.