The primary active compound in blueberries is a phenolic compound and powerful antioxidant called anthocyanin. This substance gives blueberries their rich blue color.
In addition to their antioxidant activity, blueberries have been found to protect against urinary tract infections, improve ‘tired eyes’ and possibly reduce the overall effects of aging through their potent antioxidant activity. Blueberry also has a number of antioxidants actions and improves the response of tissues to insulin.
Epidemiological data suggest that consumption of two or more servings of blueberries per week is associated with lower risk of type 2 diabetes mellitus, and suggest that the high level of flavonoids, particularly anthocyanins, in blueberries are responsible for their positive effects.
Blueberry leaves also are said to have blood sugar lowering qualities. Several cups a day prepared as a decoction is said to lower blood sugar. Three months are said to be required before benefits became apparent.
Health benefits of eating blueberries to diabetic