Adolescents are more prone to changes in lifestyles and food habits and they also impel for more opportunity to assert food choices and expand or narrow healthy option. Hence, this research was planned to study the existing pattern of consuming unhealthy foods among adolescents and impact of an awareness programme. The study was conducted at Father Muller School of Nursing, Mangalore and Shanthiniketan Pre-University College, Chikkaballapur on 100 subjects from each institute during their mid-term of academic year. Demographic profile, food habits and knowledge regarding hazards of junk foods and other healthy habits were studied using a structured questionnaire. Nutrition intervention was carried out using powerpoint presentation, brochures in three sessions. The study showed that 75% of subjects were from urban background with 46% belonging to middle adolescence age group (15-16 years). Education level of parents on an average was above Pre-University level with family income more than Rs. 15,000/- per month. Food habits of the subjects showed that 37% were vegetarian and 63% were non-vegetarian. Subjects were in the practice of carrying packed lunch; however, few subjects consumed food from outside and spent around Rs. 80/- for junk foods on weekly basis. Peer pressure and media influence were the main reasons to consume food outside. Pre-test scores showed that 72% of the subjects had moderate knowledge about junk foods and eating habits and post-test scores showed 89% of the subjects were able to grasp adequate knowledge. The post-test scores were higher in comparison with pre-test scores, showing positive impact of education programme. The study brings out the need to create awareness in adolescents regarding healthy eating habits.