Fully printed wearable biosensor tracks glucose, alcohol, pH and temperature in sweat

Imagine a future where a simple patch worn on the skin could keep tabs on your health as you go about your day, flagging concerning changes before symptoms even appear. This tantalizing vision has driven intense research into wearable biosensors that can non-invasively monitor diverse physiological parameters. While consumer devices like smartwatches can already track basics like heart rate and activity, the next frontier is tapping into the trove of molecular biomarkers carried in bodily fluids like sweat.