Nutritional care is an important part of medical care of patients and plays a key role in improvement, prevention and control of malnutrition in hospitals. The current study aimed to determine the nutrition knowledge level of doctors, nurses and nutritionists in some teaching hospitals in Tehran in 2008. In a cross-sectional study a total of 198 samples including 28 nutritionists, 81 nurses and 89 physicians were selected using simple random sampling. The current study was conducted in 9 hospitals affiliated with the Shahid Beheshti University of Medical Sciences (SBMU) in Tehran. A self-administered multiple choice questionnaire about different aspects of basic and clinical nutrition was completed. Then nutrition knowledge levels of each i...