The only sweetener in Banjo is rebiana, also known as Truvia (TM).
According to the Truvia website (FAQs for health care professionals):
Can people with diabetes use Truvia(TM) natural sweetener?
Yes, diabetic individuals can use Truvia™ natural sweetener. Clinical studies have shown that daily consumption of 1,000 mg of rebiana, equivalent to drinking eight 8-ounce servings of rebiana sweetened beverage every day, for 16 weeks did not affect blood sugar control and was well tolerated in people with type 2 diabetes. Truvia™ natural sweetener has no effect on the glycemic index.