Weight regain and impaired nutrient absorption may be harmful after sleeve gastrectomy. Sleeve gastrectomy is among the more common minimally invasive procedures for weight loss and metabolism. Based on an understanding of the structure of the stomach, the procedure involves longitudinal resection of approximately 70% of the stomach volume on the side of the greater curvature of the stomach, leaving the remaining stomach structure in the shape of a sleeve or tube after resection. The danger of sleeve gastrectomy is, on the one hand, the rebound of weight that occurs after the operation. The procedure is mainly used for the treatment of obesity and type 2 diabetes. If the postoperative residual stomach eats too fast and too much for a long time, resulting in re-expansion and increased food intake, there may be regaining weight and weight rebound; on the other hand, there is a nutritional absorption disorder, which may lead to some nutrients such as folic acid deficiency. Therefore, no matter preoperative or postoperative should follow the doctor’s advice, and after the operation, it is more necessary to actively cooperate with the control of diet and so on.