Obesity is fat accumulation in the human body that increases or excessive weight. This case may cause diseases appearing in the human body, such as hypertension, cardiovascular, diabetes, and stroke. The number of obesities increased when the Covid-19 virus started to infect Indonesia. This study was conducted in October 2021 to discover the dominant factor of health, social, and economic determinants on the obesity that increased during the pandemic, especially to the first grade in SMKN 7 Malang. This study is used analytical observational with the cross-sectional study approach. This study's population is 465 students; however, the study divides them into the sample using purposive sampling with inclusion and exclusion criteria. Hence, the final samples of the study are 102. There primarily taken from interviews and observations, also secondary data related to the name, age, gender, address of respondents. The data collection will analyze by multivariate analysis. This study found that the father's education level/mother and parents' income do not influence obesity. Then, food management, physical activity, and street food consumption have influenced obesity. In addition, the considered variable can explain the obesity variable on the teenager around 37,2%.