The purpose of this study is to make students become aware of the causal relationship between hypothermia and their living habits in order to improve their quality of life. Recently, the number of cases of hypothermia has been increasing among students. Therefore, this study examined 9th grade students' subjective health and their senses of food based on a survey conducted last year about their subjective health and current living conditions. In addition, health instruction was implemented to improve students' senses of health and their problems associated with daily life focusing on hypothermia and eating habits. Through this instruction, students tended to be aware of relationships between their health and eating habits, have goals for their future life, and improve their quality of life.