Overweight dan obesitas pada anak usia sekolah erat kaitannya dengan risikoobesitas saat dewasa dan berlanjut menjadi penyakit tidak menular, sepertidiabetes mellitus tipe 2. Penelitian ini bertujuan untuk mengetahui faktor dominanterhadap overweight dan obesitas pada siswa kelas 1 SD di Jakarta Selatan.Desain studi yang digunakan dalam penelitian ini adalah cross sectional yangmelibatkan 153 sampel kelas 1 usia 6-9 tahun di 6 SD di Jakarta Selatan.Pengukuran overweight dan obesitas menggunakan nilai Z-score indeks IMT/U.Hasil penelitian menunjukkan terdapat 32% siswa mengalami overweight danobesitas. Dari beberapa variabel yang diteliti, terdapat perbedaan bermaknakejadian overweight dan obesitas berdasarkan frekuensi konsumsi lemak,frekuensi konsumsi serat, aktivitas fisik, screen time, dan pekerjaan ibu. Analisismultivariat dengan menggunakan uji regresi logistik ganda menunjukkan screentime sebagai faktor dominan terhadap kejadian overweight dan obesitas setelahdikontrol dengan variabel frekuensi konsumsi lemak, frekuensi konsumsi serat,aktivitas fisik, pendidikan ibu, dan pekerjaan ibu. Berdasarkan hasil penelitian,disarankan bagi sekolah untuk memantau status gizi siswa. Orang tua siswadiharapkan untuk membatasi waktu anak untuk menonton TV, bermaingames/laptop/komputer di rumah dan mengajak anak untuk melakukan aktivitasdi luar rumah.Kata Kunci :Overweight dan obesitas, anak usia sekolah, IMT/U, screen time, aktivitas fisik

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Overweight and obesity on school-age children associated with risk of obesity onadulthood and would be continued become non-communicable disease, such asDiabetes Mellitus type 2. The purpose of this study is to determine the dominantfactor of overweight and obesity on 1st grade elementary school students at SouthJakarta. This study used cross sectional design with 153 sampels amongelementary school students aged 6-9 years old at South Jakarta. In this study,overweight and obesity measured using Z-score index IMT/U. The result of thisstudy shows that 32% students are overweight and obesity and there weresignificant differences of overweight and obesity based on fat consumptionfrequency, fiber consumption frequency, physical activity, screen time, andmaternal employment. Multivariate analysis using multiple regression logicticshows that screen time as dominant factor of overweight and obesity aftercontrolled by fat consumption frequency, fiber consumption frequency, physicalactivity, and maternal education, maternal employment. According to these result,it was expected for school to monitor nutritional status of their studentsperiodically. Parents are suggested to control children‟s time for watching TV andplaying games/laptop/computer at home and they must consider to take theirchildren for outdoor activities.Key words :Overweight and obesity, school-age children, IMT/U, screen time, physicalactivity.