Mayo Clinic and Gentag have announced the joint development of wireless, disposable patch sensors to monitor and manage obesity and diabetes. The wearables will communicate with smartphones via a closed-loop diabetes management system. Other indicators monitored by Gentag patches include heart rate, temperature, hydration, sweat, blood sugar, lactic acid, electrolytes and other biomarkers. It is unclear how many of these will be included in the Mayo/Gentag patch. Gentag currently monitors glucose with patches that work with tiny, battery-free sensors implanted under the skin.