Diabetes mellitus and metabolic disorders are the priority programs in Indonesia. There is one program to reduce the fatality impact of diabetes which is diabetic self-management education (DSME). This study aimed to examine the effectiveness of Diabetes Self-Management Education (DSME) on dietary habits, physical activity, and obesity. This study is a quasi-experimental approach with one group pre-test post-test design. The sample in this study was 75 people with DM type II. The intervention for all samples was done for 4 sessions. Each session lasted 60 to 120 minutes/day with a maximum of 10 patients. The findings revealed that dietary habits were good from 56.0% to 69.3%, physical activity was good from 54.7% to 76.0%, and obesity decreased from 69.3% to 57.35, respectively for pre and post-test. The paired t-test result revealed that DSME correlates with dietary habits, physical activity, and obesity (obesity, physical activity, and dietary habit with p-values 0.024; 0.007; and 0.02, respectively). In conclusion, DSME has significantly influenced dietary habits, physical activity, and obesity. Education is crucial in promoting physical activity among individuals with diabetes. By enhancing self-efficacy, providing education on self-care behaviors, and emphasizing the importance of regular physical activity, these programs contribute to improving metabolic control, quality of life, and overall health outcomes in diabetic patients.