The secret Apple project for potentially blood glucose monitoring would be amazing. Non-interstitial fluid / noninvasive sounds like a really hard problem that

The secret Apple project for potentially blood glucose monitoring would be amazing. Non-interstitial fluid / noninvasive sounds like a really hard problem that may require a very bright light source and/or a sensor more sensitive than used for heart rate. It's a worthy goal. Even more awesome would be a limited generic mass-spectrometer that could do more, arbitrary blood chemistry quantification in software without having to develop many/additional specialized sensors.