Adolescence is a critical phase that determines future maternal and child health. Nutritional status and reproductive readiness during adolescence contribute to pregnancy outcomes and child growth and development. This study aimed to analyze the effect of Community–Family-Based Nutrition Education on adolescents’ nutritional and reproductive readiness. A pre-experimental one-group pretest–posttest design was conducted among 40 adolescents aged 15–19 years selected using total sampling in the working area of Balowerti Community Health Center, Kediri City. The intervention involved structured nutrition and reproductive health education with family and community participation. Data were collected using structured questionnaires and analyzed using paired t-tests. The results showed significant improvements in nutritional readiness (64.2 ± 7.4 to 76.3 ± 6.1; p = 0.001) and reproductive readiness (67.8 ± 8.4 to 79.6 ± 7.2; p = 0.001). Community–Family-Based Nutrition Education effectively improves adolescents’ nutritional and reproductive readiness and may serve as a promotive and preventive strategy to support optimal child growth and development.
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