Meningkatnya risiko kejadian obesitas pada remaja disebabkan oleh banyakfaktor, salah satunya adalah konsumsi fast food yang berlebihan. Penelitian inibertujuan untuk mengetahui faktor dominan frekuensi konsumsi fast food siswaSMA Islamic Village, Kabupaten Tangerang pada tahun 2014. Metode penelitianyang digunakan adalah kuantitatif dengan desain studi cross-sectional. Datakarakteristik personal, pengaruh lingkungan sosial, aksesibilitas, dan pengaruhpaparan iklan fast food diperoleh dari kuesioner, sedangkan data frekuensi konsumsidan besar porsi fast food diperoleh dari semi-quantitative FFQ. Kuesioner dan FFQtersebut diberikan kepada 205 siswa SMA Islamic Village, Kabupaten Tangerang yang dipilih dengan sistem sampling acak sederhana. Selain itu, digunakan pula perangkat lunak Google Maps Geo-Coding Javascript API versi 3.0 untuk mengukurjarak sekolah terhadap restoran fast food. Hasil penelitian ini menunjukkan sebanyak54,6% responden mengonsumsi fast food dengan frekuensi sering. Selain itu,terdapat perbedaan proporsi pada pengaruh peer group (p=0,001), besar uang saku(p=0,010), dan pengaruh paparan iklan fast food (p=0,000) dalam menentukan frekuensi konsumsi fast food. Berdasarkan hasil analisis regresi logistik ganda, pengaruh paparan iklan fast food merupakan faktor dominan dalam menentukanfrekuensi konsumsi fast food. Siswa dengan pengaruh paparan iklan fast food yangkuat berpeluang 2,6 kali lebih sering mengonsumsi fast food dibandingkan siswadengan pengaruh lemah setelah dikontrol variabel status pekerjaan ibu, uang saku,dan pengaruh peer group. Diperlukan edukasi gizi mengenai gizi seimbang, anjurankonsumsi zat gizi harian, jenis, kandungan, dan dampak konsumsi fast food agarsiswa terhindar dari konsumsi fast food yang berlebihan.Kata Kunci: Fast food, iklan fast food, konsumsi fast food, remaja.

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The risk of adolescents obesity has increased by some factors, one of thethem is the excessive of fast food consumption. The aim of this study is to determinethe dominant factor in fast food consumption frequency among the students of SMAIslamic Village, Kabupaten Tangerang in 2014. This study used a quantitativemethod and cross-sectional design. It used questionnaire about personalcharacteristics, social influences, accessibility, amount of pocket money, and fastfood advertisements influences. Semi-quantitative FFQ also used to determine thefast food frequency. Those questionnaires were given to 205 SMA Islamic Villagestudents which selected by simple random sampling. Moreover, this study also usedsoftware Google Maps Geo-Coding Javascript API versi 3.0 to determine theproximity between school and fast food restaurants. Result showed that 54,6% ofrespondents consumed fast food often. Furthermore, there is a difference proportionin peer group influences (p=0,001), amount of pocket money (p=0,010), and fastfood advertisements influences (p=0,000) in determining the frequency of fast foodconsumption. Based on multiple regression analysis, fast food advertisementsinfluence is the dominant factor in determining fast food consumption frequency.Students who have strong influences from fast food advertisements has anopportunity 2,6x more often to consume fast food than students who have weakinfluences after controled by other factors, such as mother employment status,amount of pocket money, and peer group influences. Nutrition education aboutbalance diet, nutrition daily allowance, and fast food is needed to prevent thestudents consume excessive fast food. Keywords : Adolescents, fast food consumption, fast food advertisements.