Diabetes mellitus is generally suffered by the elderly age group, but currently diabetes mellitus can also occur in adolescence. The main cause of type 2 diabetes mellitus in adolescents is an unbalanced lifestyle, including an unbalanced diet. The study aimed to find out the relationship between adolescents knowledge and attitudes about a balanced diet and preventive measures for type 2 diabetes mellitus at senior high school 10 Yogyakarta. The research design uses a quantitative method with proportionate stratified random sampling technique. The sample of this study was 93 respondents. The data were analyzed univariate and bivariate using Kendal's tau-b Test. The results were obtained between adolescents knowledge about diet with preventive measures for type 2 diabetes mellitus with a p-value of 0.010 (p?0.05) with a positive correlation of r=0.264 (0.2-0.399) and results between adolescents' attitudes about diet with preventive measures for type 2 diabetes mellitus with a p-value of 0.013 (p?0.05) with a positive correlation of r=0.300 (0.2-0.399). Interventions for preventing diabetes mellitus can be carried out, especially healthy living behavior. Future research can examine other factors, such as physical activity.
                        
                        
                        
                        
                            
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