(slaps head) I meant to say, smart watches are more suited than cell phones for health monitoring. And of course people use them for that.

An actual needle inserted under the skin? That doesn't seem very comfortable, especially if the monitor is being used by non-diabetics. Why go through constant discomfort. On a buttock?! Or even underarm or lower belly? Ouch.

I can see that it would be a useful diagnostic for a T2 diabetic, to track how their body responds to lifestyle choices throughout the day, but for how long?

I knew one very old fellow who could tolerate only brown bread and soup, and would go into a diabetic coma very easily if he ate anything, literally, than that prescribed diet. So something like this would have been useful for him. I think he went into hospital and probably died because they wouldn't tailor the diet for exactly his needs. Poor guy. But he was well up into his 90's and had a very full life.