 This study evaluated the effects of preoperative administration of oral nutritional supplements, ONS, on the self-sufficiency, physical status, and nutritional status of patients undergoing elective colorectal resection. The study found that preoperative ONS did not reduce postoperative morbidity or enhance recovery. Additionally, patient self-sufficiency, physical status, and nutritional status were not affected by preoperative ONS. This article was authored by Melontesar, Veronica Kozysnikova, Lubamir Martinek, and others.