Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 50 9 2021 09 02 1796 1804 EN Goksel Durmus Department of Public Health Nursing, Hasan Kalyoncu University, Gaziantep, Turkey Tulay Ortabag Department of Public Health Nursing, Istanbul Gedik University, Istanbul, Turkey Serpil Ozdemir Department of Public Health Nursing, University of Health Sciences Turkey, Ankara, Turkey 2019 01 06 2020 02 03 Background: Obesity has become widespread among adolescents throughout the world. This study aimed to determine the relationship between problematic internet use and obesity among 10-19 yr old adolescents. Methods: The descriptive study was carried out in a private elementary and high school in Gaziantep Province in the Eastern Turkey in 2016-2017. Overall, 474 adolescents and 938 their parents were enrolled. Data collection form consisted of three parts. The first part included questions about sociodemographic characteristics of the adolescent and his/her parents. The second part included data on anthropometrical measurements, dietary habits and physical activity level. Third part of the data collection form included Problematic Internet Usage Scale. First, anthropometrical measurements of the adolescents were recorded. Then, the data collection forms were applied to adolescents and their parents. Results: 34.8% of adolescents were overweight and obese. Approximately four out of ten male adolescents and three out of ten female adolescents were overweight or obese (P<0.05). Girls had less problematic internet use behaviors (P<0.05). There were statistically significant differences between age, sex, socioeconomic status, unhealthy eating habits and problem internet usage (P<0.05). Conclusion: Periodic screening should be done to determine the prevalence of obesity and problematic internet usage. Training programs on regular physical activity and healthy nutrition should be prepared and guidance services should be provided for the reduction of obesity rates and the protection of ideal weight. https://ijph.tums.ac.ir/index.php/ijph/article/view/15821 https://ijph.tums.ac.ir/index.php/ijph/article/download/15821/7346