It's apparently doable optically, similarly to blood oxygen, albeit much more challenging. There's an actual product out for it from one of Apple's suppliers, e

It's apparently doable optically, similarly to blood oxygen, albeit much more challenging. There's an actual product out for it from one of Apple's suppliers, even: https://appleinsider.com/articles/21/07/14/apple-supplier-launches-non-invasive-glucose-monitor-health-sensor-tech https://appleinsider.com/articles/21/07/14/apple-supplier-la...