A new smart ring could reveal far more than how well someone slept or how fast their heart is beating. Engineers at the University of California, San Diego, have developed an experimental smart ring that continuously analyzes sweat from the finger to monitor several molecules associated with metabolism, nutrition, exercise, and alcohol consumption. The researchers describe the system in Nature Communications as the first fully integrated smart ring intended for routine biochemical monitoring. In tests involving healthy volunteers and people with type 1 diabetes, glucose measurements from the ring closely followed readings from commercial continuous glucose monitors (CGMs). DOI: 10.1038/s41467-026-75980-zThis work was supported by the UC San Diego Center of Wearable Sensors (CWS) and the National Science Foundation – UC San Diego Materials Research Science and Engineering Center (DMR‑2011924).