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Kegemukan merupakan masalah serius karena penderita kegemukan terus meningkat di setiap negara. Lebih dari 340 juta anak dan remaja di dunia mengalami kegemukan dan 174 di Kota Jambi. Pengetahuan penting untuk membentuk sikap dan perilaku. Pengetahuan dan sikap mengenai gizi akan mempengaruhi seseorang dalam mempraktikkan gizi seimbang, sedangkan aktivitas fisik mempengaruhi status berat badan. Tujuan Penelitian ini adalah untuk mengetahui hubungan pengetahuan, sikap dan perilaku gizi seimbang dan aktivitas fisik dengan kejadian kegemukan pada remaja. Desain penelitian cross sectional dilakukan pada bulan Mei Juni 2023 di SMA N 8 Kota Jambi pada sampel sebanyak 70 responden dengan teknik random sampling. Pengumpulan data menggunakan microtoise, timbangan berat badan digital dan kuesioner. Analisis dilakukan dengan uji chi-square dan Regresi. Sebanyak 28 (40,0%) responden overweight dan obesitas, 29 (41,4%), 35 (50,0%), 29 (41,4%) memiliki pengetahuan, sikap, perilaku gizi seimbang kurang dan 25 (35,7%) memiliki aktivitas fisik sedang. Uji statistik menunjukkan ada hubungan pengetahuan (0,000), aktivitas fisik (0,028) dengan kegemukan dan tidak ada hubungan sikap (0,293), perilaku (0,266) dengan kegemukan. Ada hubungan antara pengetahuan gizi seimbang, aktivitas fisik dengan kejadian kegemukan, tidak ada hubungan antara sikap, perilaku gizi seimbang dengan kejadian kegemukan pada remaja di SMA N 8 Kota Jambi.

Overweight is a severe problem because obesity sufferers are rising in every country. Over 340 million children and adolescents worldwide are obese, and 174 in Jambi city. Knowledge is essential for shaping attitudes and behaviors. Knowledge and attitudes regarding nutrition will influence a person in practicing balanced nutrition, while physical activity affects weight status. This study aimed to determine the relationship between knowledge, attitudes, and behaviors of balanced nutrition and physical activity with pbesity in adolescents. The cross-sectional research design was carried out in May June 2023 at SMA N 8 Jambi City on samples A total of 70 respondents with random sampling techniques. Data was collected using microtomes, digital weight scales, and questionnaires. The analysis was performed whit chi-square and Regression tests. A total of 28 (40.0%) respondents were overweight and obase, 29 (41.4%), 35 (50.0%), 29 (41.4%) had less balanced nutritional knowledge, attitudes, and behaviors and 25 (35.7%) had moderate physical activity. Statistical tests showed there was an association between knowledge (0.000) and physical activity (0.028) with obesity and no relationship between attitude (0.293) or behavior (0.266) with obesity. There is a relationship between knowledge of balanced nutrition and physical activity and the incidence of obesity, and there is no relationship between attitudes to balanced nutrition behavior and the incidence of obesity in adolescents at SMA N 8 Jambi City.