Efficacy and Safety Comparison Between SMOFlipid and Lipovenoes MCT

Inclusion Criteria: 1. Age between 25 \~ 75 years old 2. Postoperative (gastrectomy) patients required parental nutrition for at least 5 days 3. Signed informed consent form Exclusion Criteria: 1. Known hypersensitivity to fish-, egg- or soy protein or to any of the active substances or excipients 2. Known type IV hyperlipidemia, disturbances in lipid metabolism or hypertriglyceridemia. If the fasting S-triglyceride value at the time of inclusion is \>2.26 mmol/l (\>200 mg/dl) the subject must not be included 3. Severe liver insufficiency (total serum bilirubin ≧ 3 mg/dL or parental nutrition as a contraindication.) 4. Severe renal insufficiency with need for dialysis, chronic stable renal insufficiency defined as S-creatinine value of \>3mg/dL (250 µmol/l), or dialysis/hemofiltration therapy 5. Over weight (BMI\> 30kg/m2) 6. Severe blood coagulation disorders 7. Inborn abnormality in amino acid metabolism 8. Unstable conditions (e.g. severe post-traumatic conditions, uncompensated diabetes mellitus, acute myocardial infarction, stroke, embolism, metabolic acidosis, severe sepsis and hypotonic dehydration) 9. Known diabetic ketoacidosis 7 days prior to randomization. 10. Acute shock 11. General contraindications to infusion therapy: acute pulmonary oedema, hyperhydration, decompensated cardiac insufficiency 12. Pregnancy or lactation 13. Chemotherapy within 7 days before start of the trial 14. Participation in another clinical study with an investigational drug or an investigational medical device within 1 month prior to start of study or during the study 15. Already accept parental nutrition therapy.