The objectives of this research are ; 1) to study the knowledge about healthy food;2) to study the attitude towards consumption of healthy food;3) to study the relationship between the individual of personal factor and health factor and 4) to study relationship between knowledge and attitude towards of healthy food of high school teacher at Nonthaburi that influence their behaviors. Questionnaires were used as a tool for collecting the data and the data was analyzed using percentage mean standard deviation t-test f-test and Pearson correlation (r) Most of the responders of this research are female. Age group is between 51-60 years old. Height group is between 151-160 centimeters. Weight group is between 51-60 kilograms. The majority of their salaries are between 28001-33000 Baht. The level of personal sickness is low. The level of understanding of how to consume healthy food is high. The attitude of consuming healthy food is high level. But the behavior of consuming healthy food is mostly at moderate level According to the study of relationship between the individual of personal factor and health care factor. The results are: there is relationship between sex and behavior of consuming healthy food statistically significant at the .05 level. Moreover the study of relationship between the knowledge and attitude of consuming healthy food of high school teacher that impact to their behavior show knowledge and attitude have relationship to behavior to consume healthy food statistically significant at the .05 level