Wang L, et al. - In order to determine the effect of laparoscopic sleeve gastrectomy (LSG) on type 2 diabetes mellitus (T2DM) in patients with a body mass index (BMI) less than 30 kg/m², researchers retrospectively analyzed the clinical data of 25 patients with type 2 diabetes mellitus (T2DM) and body mass index 23.23–29.97 kg/m² who were treated by LSG at the Department of Bariatric and Metabolic Surgery in China-Japan Union Hospital of Jilin University from May 2016 to May 2017. Outcomes revealed a significant influence of LSG on patients with type 2 diabetes mellitus with BMI less than 30 kg/m² in a short time. At 3, 6, and 12 months after the operation, complete remission rates of type 2 diabetes mellitus were 40%, 60%, and 68%, respectively, and complete remission rates for insulin resistance index were 52.4%, 80%, and 80%, respectively.