Just did a search for continuous monitoring systems as I thought they should be possible and there is a market. Found the Dexcom which was the sort of thing I was expecting but also the C8 Medisensors non-invasive one which I think is very exciting - then found this thread when I was going to post about it. I'm type 2 diet controlled which probably isn't what these are aimed at - and at $4000 it's pretty expensive. I would have thought there would be a market for rental though. It would be good to get an indication of how your body is reacting to food and exercise over a period of time and I think everyone could benefit from that. As it is non-invasive that should be possible.