Scientists have created a tiny biosensor platform using carbon nanotubes that can detect multiple important molecules in blood and food simultaneously. The sensor uses special enzymes that recognize glucose, lactate, glutamate, and dopamine, making it useful for monitoring diabetes, fatigue levels, and brain chemistry. By adding another enzyme called catalase, the sensor works even better and across a wider range of concentrations. Tests on real blood and food samples show the sensor accurately measures these important biomarkers, making it potentially valuable for both health monitoring and food quality testing.