Background: Menstrual disorders represent a significant reproductive health issue among female adolescents and can be influenced by various factors, one of which is suspected to be unhealthy dietary habits, such as fast food consumption. Objective: This study aims to analyze the correlation between fast food consumption behavior and menstrual disorders among female adolescents at SMAN 1 Godean, Sleman Regency, Yogyakarta. Methods: This quantitative study employed an analytical observational design with a cross-sectional approach. The research population comprised 140 eleventh-grade female students, with a sample of 58 respondents (n = 58) selected using proportional stratified random sampling. Data were collected via questionnaires and analyzed using the Spearman Rank correlation test. Results: The majority of respondents exhibited a moderate level of fast-food consumption (63.8%) and experienced moderate menstrual disorders (65.5%). Statistical test results indicated no significant correlation between fast-food consumption behavior and menstrual disorders (p=0.539; r=−0.082). Conclusion: There is no significant correlation between fast food consumption behavior and menstrual disorders among female adolescents at SMAN 1 Godean. Nevertheless, as a preventive measure for reproductive health, students are advised to transition to a balanced nutritional diet by optimizing the Free Nutritious Meal (MBG) program at school. Implementing an MBG menu rich in iron and fiber could be a practical way to provide healthy food alternatives while also educating students to limit fast-food intake to support long-term health.
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