Asian Indians have high rates of diabetes and prediabetes, and this disease has profound impacts not only on health outcomes, but on work productivity measures. There is strong evidence that lifestyle changes can improve health outcomes among this population and worksites present a unique and effective environment for potential interventions. This study will implement and evaluate a worksite-based lifestyle intervention. The worksite education program includes 2,000 adults with either prediabetes or unmedicated diabetes at eight diverse worksites in India. The program uses scientific innovations (text message support for lifestyle changes), social innovations (peer health educators delivering the program), and business innovation (worksite partnership). The project will measure program success, acceptability, effectiveness, and cost-effectiveness. If successful, the intervention can be disseminated to other worksites in India and beyond.