New York: Researchers have developed a thin adhesive film that could upgrade a consumer smartwatch into a powerful health-monitoring system.The system looks for chemical indicators found in sweat to give a real-time snapshot of what's happening inside the body.According to the study, published in the journal of Science Advances, the researchers engineered a disposable, double-sided film that attaches to the underside of a smartwatch.The film can detect molecules such as metabolites and certain nutrients that are present in body sweat in very tiny amounts.They also built a custom smartwatch and an accompanying app to record data."The inspiration for this work came from recognizing that we already have more than 100 million smartwatches and.