Control diabetes: Just like the fruit, jamun seeds, are also possess anti-diabetic activity. The seeds contain some chemicals which prevent the conversion of starch into sugar and hence aid in keeping your blood sugar level in control. Detoxifies the body: The seeds of jamun are reported to be rich in flavonoids, a powerful antioxidant, that not only helps in flushing harmful free radicals from the body but also exerts a protective effect on the antioxidant enzymes.