Inclusion Criteria:

- Patients with GI cancer (stomach, pancreas, small and large bowel and rectum)
histologically proven

- Well nourished patients as defined by a total score of <3 on the nutritional
screening tool NRS-2002 (46) (Appendix III)

- Patients who are >= 18 years of age;

- Patients who have signed a written Informed Consent (Appendix I) prior to admission
to the study;

- Patients who have an ECOG performance status of 0, 1 or 2 (Appendix II).

- Patients able to orally consume 750 mL or more of liquid a day prior to surgery

Exclusion Criteria:

- Patients who have co-morbid conditions, uncontrolled metabolic conditions or
psychiatric conditions that might make tolerance or evaluation of the feeding formula
difficult;

- Patients who are pregnant;

- Patients with cardiac failure as defined by the Goldman classification class>3

- Patients with respiratory failure (FEV<0.8l/sec)

- Patients with renal failure (Cr >= 3mg/dl or dialysis patients)

- Patients with hepatic dysfunction (Child >A)

- Patients suffering from an intestinal obstruction or ileum

- Patients with an Hb level of <=8 g/dL experiencing gastrointestinal hemorrhaging

- Patients with HIV, HCV, HBV

- Patients requiring immunosuppression treatments

- Patients undergoing emergency surgery

- Other patients determined by a study investigator to be inappropriate for enrolment
in this study