Introduction: The increasing number of teenagers who are obese has become a public concern, considering the impact of obesity on physical and psychosocial health. The aim of this research is to investigate the relationship fast food consumption habits and physical activity with incident of obesity among urban high school students.Method: This study was analytical correlation design with a cross sectional approach. The sample in this study was 78 students at SMAN 1 Konawe grades X and XI selected using Stratified Random Sampling techniques. The Food Frequency Questionnaire, the Physical Activity Level, and body mass index were the instrument used in this study. The statistical test used is Pearson chi-square.Results: Most of the respondents had a habit of consuming excessive fast food (59.0%) and had low physical activity (50.0 %). There was a significant relationship between fast food, physical activity and obesity (p = 0.000 respectively). Conclusions: Fast food consumption habits and physical activity are significantly related to the incidence of obesity in urban high school students. It is necessary to carry out obesity prevention and control programs involving various sectors in society, including educational institutions.
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