Food is a nutritious substance that people eat or drink in order to maintain the life growth. Food is any substance consumed to provide nutritional support for an organism. Adolescence is a significant period for both physical growth and sexual growth. Nutrition being an important determinant of physical growth of adolescents is a crucial area that needs much attention. This study aims to find the effectiveness of video assisted programme on knowledge and attitude regarding health hazards of junk food among adolescents and to find the relationship between knowledge and attitude regarding health hazards of junk food among adolescents. The study was conducted in LMS Higher Secondary School, Neyyoor. Simple random sampling technique was adopted. Samples were selected on the basis of inclusion criteria. Samples used were 60 students who were studying in the LMS Higher Secondary School, Neyyoor. The data collection tools developed for generating the data, were structured knowledge questionnaire to assess the knowledge of adolescence regarding health hazards of junk food. Four point Likert attitude scale was used to assess the attitude of adolescents about health hazards of junk food. The study was based on Kenny's open system model. The research design adapted for this study was one group pretest posttest design. In the post test the mean knowledge score was 16.50 with SD 1.79 and the attitude score was 36.53 with SD 3.50. The relation between these two variables was analyzed by using Karl Pearson correlation coefficient. There is high degree positive correlation in these variables. There is no association between pretest level of knowledge and attitude among adolescence regarding junk food and their selected demographic variables. This study reveals that the video assisted programme is effective in improving the knowledge and attitude of adolescence on health hazards of junk food. Though the knowledge and attitude of the adolescence were significantly improved with highest improvement in mean value, it is important to create awareness about junk food among adolescents. So teaching about effects of junk food to all the schools will improve the health status and eating pattern of the students. So we strongly recommend the awareness video assisted programme about health hazards of junk food to all the school children.