Purpose: After gastrectomy for gastric cancer, patients often lose significant body weight because of decreased caloric intake and nutrient absorption. Body weight typically requires approximately 1 year to stabilize. This study aimed to examine the changes and predictors of body composition during the first postoperative year.
Methods: A total of 230 patients underwent radical gastrectomy for stage I to III gastric cancers. Body composition was measured using bioelectrical impedance analysis, and changes were analyzed over 1 year. Multiple regression analysis was used to identify predictors of body composition changes.
Results: Body composition changes and significant body weight and body fat mass reductions occurred primarily within the first 6 months postoperatively. Skeletal muscle mass initially decreased but improved after 6 months without significant changes related to adjuvant chemotherapy. Increased edema was observed at 6 and 12 months postoperatively in patients after total gastrectomy and adjuvant chemotherapy. Gastrectomy type and body mass index significantly affected postoperative body weight changes. In addition, gastrectomy type was associated with changes in skeletal muscle mass and bone mineral content. Adjuvant chemotherapy significantly affected the whole-body phase angle at 6 and 12 months.
Conclusion: Our findings emphasized the initial significant reductions postoperatively and subsequent adjustments over time and elucidated the complex interplay between surgical techniques, adjuvant treatment, and patient characteristics and midterm changes in body composition.
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