Cell Reports MedicineA prospective cohort study collaborating with the team of Professor Bao Yuqian from the Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine and the team of Professor Xia Xia from the Information Institute of Shanghai Center for Disease Control and Prevention was published online in January 2026 [Hu T, Cai R, Xu Y, et al. Longitudinal body mass index exposure-based threshold to prevent mortality for populations with type 2 diabetes mellitus. Cell Rep Med, 2026, 7 (1): 102566. DOI: 10.1016/j.xcrm.2025.102566.]. in view of the important problem that middle-aged and elderly patients with type 2 diabetes have not yet had a clear cut-off point for long-term weight management, the research team introduced "time above target range (TAR)" and "time Within BMI target range (TTR)" Two indexes containing time dimension, which put forward the cut-off point for long-term weight management of middle-aged and elderly patients with type 2 diabetes in China for the first time in the world.