<![CDATA[Type 2 Diabetes Mellitus is increasingly observed among adolescents, driven by unhealthy dietary behaviors and lifestyle transitions. This study aimed to examine the relationship between diabetes knowledge and fast food consumption behavior as a risk factor for Type 2 Diabetes Mellitus among eleventh-grade students at SMA Islam Sultan Agung 1 Semarang. An observational analytic study with a cross-sectional design was conducted involving 94 respondents selected through total sampling based on inclusion criteria. Data were collected using the Diabetes Knowledge Questionnaire (DKQ) and Food Frequency Questionnaire (FFQ), and analyzed using Spearman correlation with a significance level of p<0.05. The findings indicate that a considerable proportion of respondents exhibited low knowledge levels and frequent fast food consumption patterns. Statistical analysis revealed a significant but weak positive correlation between knowledge and consumption behavior. These results suggest that knowledge alone is insufficient to shape healthy dietary practices, as external determinants such as environment, accessibility, and social influences also play substantial roles. Comprehensive interventions integrating education, behavioral strategies, and environmental modifications are required to effectively reduce metabolic disease risk among adolescents. ]]>
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