The purpose of this study is to examine the difference between ideal and real on dietary habits and the relationships between actual dietary habits and usual health behavior. In this study, male high-school students (N=267) zcompleted questionnaires regarding their present dietary habits, ideal dietary habits, and usual health behavior.   The major findings were as follows: Life style of “whole family eating together” was positively associated with all factors of health behaviors.   Overall, it was thus inferred that the custom of “whole family eating together” had a effect on a maintaining students′ health. There was a tangible difference between the actual life style of eating and ideal life style of eating except “whole family eating together”. Key words; actual life style of eating, ideal life style of eating, health behavior, male high school students.assess the ability of food and meals corresponding to their environment.