If you find this field interesting, Know Labs is working on a non-invasive continuous glucose monitor using RF spectroscopy: https://www.knowlabs.co
Non invasive would be a golden goose. I don’t think I want to have something sticking into my skin for weeks on end.
[1] Meet the inventor: Professor Adrian Porch from Cardiff University:
https://www.med-technews.com/medtech-insights/latest-medtech...
[2] Microwave Noninvasive Blood Glucose Monitoring Sensor: Human Clinical Trial Results: