Diabetes is a disease that can reduce the quality of life of patients and lead to death. Based on Indonesian Basic Health research, the prevalence of diabetes mellitus has increased over several years. Breadfruit leaves contain antioxidant compounds that can lower blood sugar by inhibiting glucose transport in the gastrointestinal tract and stimulating insulin secretion in pancreatic beta cells. The study aimed to assess the effect of giving Breadfruit Leaf Extract on reducing Fasting Blood Sugar among type 2 Diabetes Mellitus Patients. The study used a quasi-experiment study with a randomized pretest-posttest, design with the control group. It involved 39 outpatients for type 2 diabetes mellitus at Biru Public Health Center of Bone Regency, who had suffered from Diabetes for 1-4 years. The sample was divided into 2 groups by simple random sampling, 19 respondents for the intervention group and 20 respondents for the control group. Data collected were the socio-demographic characteristics and fasting blood sugar levels. In the intervention group, breadfruit leaf capsules were given at a dose of 500 mg 1x1 for 21 days, while the control group was only given health education. The data were analyzed using the Chi-Square test, paired t-test, independent t-test, Wilcoxon Signed Rank Test, and Mann-Whitney. The majority of respondents aged 46-55 years were 53.8% in both groups, 74.4% were female, while the majority of BMI status had normal nutritional status as much as 41%. There was a change in FBS levels in the intervention group before (263.31 ± 134.43) and after (174.84 ± 84.99) intervention (p-value = 0.000). there was a change in FBS levels in the group before (181.35±91.36) and after (147.45 ±79.25) intervention (p-value = 0.001). it is known that there is a significant difference in changes in fasting blood sugar levels of patients with diabetes mellitus in the intervention group (-88.47±88.01) and the control group (-33.90±53.53) with (p-value = 0.024). The test results show that the content of flavonoids and other non-nutritive substances in breadfruit leaves has an effect on lowering the FBS of patients with diabetes mellitus and can be used as an alternative medicine in patients with diabetes mellitus.