Measuring blood sugar level is very important for controlling diabetes and other diseases. Usually, measuring blood sugar requires testing a drop of blood in a blood glucose meter or using an implantable continuous blood glucose monitor (CGM). At present, the methods of measuring blood sugar level include collecting blood samples and using medical-grade equipment. Apple will adopt finger puncture, a typical invasive medical practice, but it will make measuring blood sugar level through applewatch non-invasive.
In IOS 15, blood sugar highlight is added as a health indicator in health application. Applewatch collects a lot of data during exercise and sleep, so you can see highlighted blood sugar and heart rate and respiratory rate data after exercise or waking up, and provide interactive charts to view blood sugar data. But users must use external hardware to provide data to see whether their blood sugar is high or low. If Apple adds glucose monitoring function to future Applewatch models, it will make it easier for users to check their blood sugar data.