1. Fasting blood glucose (FBG) level reduction activity The result of this study shows that after the introduction of diet control, exercise and intake of Syzygium cumini (L).Skeels seed extract or placebo, both group shows lessened blood glucose level. However, only the group with Syzygium cumini (L).Skeels seed extract shows significant decrease in fasting blood glucose level. Our finding correlates with the result of Ramahandridona & Rakotondravoavy (1985), which used the same dosage of extract. Fasting blood glucose levels in placebo group slightly decreased, though they are not significant. Our finding correlates with the previous study by Sahana et al. (2010). This may be due to the lifestyle modification and diet control education. The placebo group tended to change their behaviors, which resulted in the decrease in FBG levels. However, only Syzygium cumini (L).Skeels seed extract group shows significant decrease in FBG levels