Abstract:Objective To analyze the body compositions of patients with gastrointestinal cancer after surgery under the enhanced recovery after surgery (ERAS) by bioelectrical impedance spectroscopy (BIS) to compare the change trend of postoperative and preoperative body composition in gastric cancer patients and intestinal cancer patients. Methods A total of 246 patients with gastrointestinal cancer receiving surgery at Jiangsu Province Hospital of Chinese Medicine from July 2018 to December 2019 were selected, including 100 cases in gastric cancer group and 146 cases in intestinal cancer group. Body composition monitoring and statistical analysis were performed before and 6 and 12 months after surgery in two groups. Results In gastric cancer group, compared with preoperative, all body composition indicators of patients decreased statistically at 6 and 12 months after surgery (P＜0.01) . After surgery in intestinal cancer group, body weight, BMI and body fat increased compared with those before surgery (P＜0.01) , but there were no statistical differences in protein level, muscle mass, lean tissue mass and skeletal muscle mass (P＞0.05) . At 6 months after surgery, only 15.53% of gastric cancer patients returned to their preoperative weight, while 56.67% of colorectal cancer patients returned to their preoperative weight. At 12 months after surgery, there was no increase of proportion of patients returned to preoperative body weight in gastric cancer group, while 65.33% of patients recovered to their preoperative weight in intestinal cancer group. Conclusion Under the ERAS protocol, all gastrointestinal cancer patients recovered quickly and discharged from hospital, but the body composition showed different changes in the long term after surgery. The nutritional status of patients with gastric cancer significantly deteriorate compared with that before surgery, while the nutritional status of patients with intestinal cancer show a trend of improvement. The patients with gastric cancer have a higher nutritional risk after surgery and should be paied with more attention and new strategies for nutritional treatment.