No Pricks, Big Hopes: The Quest for Noninvasive Glucose in Wearables
Researchers continue to chase truly noninvasive glucose monitoring for wearables, a notoriously difficult problem because glucose signals are small and easily swamped by other biological signals. The effort has shifted from tear-based sensors (which proved unreliable) to methods that detect glucose through the skin, with Raman spectroscopy showing promise but requiring highly sensitive, bulky optics. MIT researchers have developed a working shoebox-sized prototype that reads skin glucose signals and aims to miniaturize it for wearables, with a startup partner planning market release around 2029–2030 after FDA clearance. The path to a consumer device like an Apple Watch remains long due to the need for medical-grade accuracy and substantial miniaturization, but progress continues on narrowing the signal-to-noise gap and shrinking the technology for everyday use.
