The study aims to assess the general nutrition knowledge of physicians, to evaluate the concepts of patient's nutritional assessment and to identify the knowledge of physicians regarding nutrition of hospitalized patients who are taking "total parenteral nutrition or enteral feeding". A descriptive cross-sectional study through validated questionnaire with multiple choice questions was distributed to 36 physicians working in two departments at Shifa'a hospital "Surgery and Obstetrics", in Gaza City between March and July 2011. The questions divided into two main groups; each one composed of 12 questions. First part dealt with knowledge of assessment and principles of nutrition hospitalized patient. The second part dealt with diet disease relationship.