Effect of oral nutritional supplements on outcomes of colorectal cancer surgery

Interventions: Dietary Supplement : ? Oral nutritional supplement - Newcare Omega (Daesang Wellife) : Constituents (%) - Protein:Lipid:Carbohydrate = 18:27:55 : arginine 0.25% 500mg, fish oil 0.25% (DHA+EPA 18%) 70mg, Protein 9g ? 2 packs per day, for 7 days (based on previous studies) : 9 days before surgery ~ 3 days before surgery * Contrast drug; N/A ** If CNUHH-NRST =4, preoperative nutritional counseling by NST team should be encouraged Primary outcome(s): Infectious complication rate Primary Purpose : Treatment, Intervention Model : Parallel, Blinding/Masking : Open, Allocation : RCT