Hubungan frekuensi konsumsi junk food dan aktivitas fisik dengan persentase lemak tubuh dan otot rangka pada mahasiswi S1 Gizi

Background: Body composition is an important indicator of nutritional status that can be assessed through body fat and skeletal muscle percentages. Female nutrition students are a group of young adult women who may have a high junk food consumption frequency and low levels of physical activity, which may affect body composition.Objectives: To examine the associations of junk food consumption frequency and physical activity with body fat and skeletal muscle percentages among female nutrition students.Methods: An analytical cross-sectional study was conducted among 200 female nutrition students selected through proportionate stratified random sampling. Data were collected at the FIKK Building, Universitas Negeri Surabaya, in December 2025 using the Food Frequency Questionnaire (FFQ), Global Physical Activity Questionnaire (GPAQ), and an OMRON Karada Scan HBF-375 bioelectrical impedance analyzer. Associations were analyzed using Spearman's rank correlation at a 95% confidence level (α = 0.05).Results: The frequency of junk food consumption was significantly associated with body fat percentage (p<0.001; r=0.408) and skeletal muscle percentage (p<0.001; r=-0.350). Physical activity was also significantly associated with body fat percentage (p=0.003; r=-0.208), but was not associated with skeletal muscle percentage (p=0.330; r=0.069).Conclusion: Junk food consumption frequency was associated with body fat and skeletal muscle percentages, whereas physical activity was associated only with body fat percentage. Because of the cross-sectional design, these findings should not be interpreted as causal.