<![CDATA[Heart disease remains an important public health problem, while dietary habits associated with cardiovascular risk can begin to develop during adolescence. Health education therefore needs media that can deliver practical and understandable information. This study aimed to determine the effectiveness of leaflet and educational video media on adolescents’ knowledge, attitudes, and actions regarding healthy eating as an effort to prevent heart disease. A quantitative quasi-experimental study with a two-group pretest-posttest design was conducted among 36 grade XI students of SMA Negeri 22 Palembang in February–June 2026. Participants were divided into a leaflet group and an educational video group, with 18 respondents in each group. Data were collected using a validated and reliable questionnaire covering knowledge, attitudes, and actions. Within-group changes were analyzed using the Wilcoxon Signed Rank test, while differences between media were analyzed using the Mann-Whitney U test. The leaflet group showed significant changes in knowledge (p<0.001) and attitudes (p<0.001), but not actions (p=0.471). The video group showed significant changes in knowledge (p=0.001) and attitudes (p=0.001), but not actions (p=0.059). Comparison between media showed a significant difference in knowledge (p=0.020), while attitudes (p=0.168) and actions (p=0.392) did not differ significantly. These findings indicate that both media can support health education, with a statistically significant difference between media observed only for knowledge in this study.]]>
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