https://www.theregister.co.uk/2020/01/14/ai_blood_sugar/

Academics have applied for a patent describing how a neural network can detect low blood-sugar levels by analyzing heartbeat patterns rather than a blood sample.

Keeping track of glucose levels is annoying and painful. Multiple times per day, diabetics have to prick their finger, place the small drop of blood on a test strip, and insert that strip into a glucometer to get a reading, and then dial up their insulin dosage, or eat or drink carbohydrates, as necessary. In the US, at least, these strips aren't cheap, thanks to the healthcare system.