This research was aimed to study 1) The knowledge and dietary habits of Faculty of Medicine Vajira Hospital Navamindradhiraj University personnels 2) body mass index of personnels 3) relationship between dietary habits and body mass index. The sample used in this study were personnels of Faculty of Medicine Vajira Hospital Navamindradhiraj University. The survey was conducted on 297 samples who were non-medical and nurses personnels. Simple Random sampling method was used. The tools were foods and nutrition knowledge dietary habits and nutritional status questionnaire. Data were analyzed by using frequency percentile mean and standard deviation. To study relationship analysis correlation coefficient analysis was used. The study revealed that 66.00% of Faculty of Medicine Vajira Hospital Navamindradhiraj University personnels had very good nutrition knowledge 13.10% 12.10% 6.70% and 2.00% had good moderate passing and not passing knowledge respectively. The food consuming dietary habit was in good 52.50% 38.00% in moderate 7.40% in very good and 2.00% was in fair in orderly. 50.20% of the group had normal nutritional status while 40.70% and 9.10% were over nutrition and low nutritional status respectively. The study of the relationship between nutrition knowledge and consumption behavior revealed that there was a significant relationship between the two variables at significant level of 0.05