I find that bananas increase my blood sugars more than other fruits. Having said that, they are great before the gym or if I have a hypo. You could try getting some baby bananas - smaller so less sugar!
A medium banana can be over 30g of carbs which is my daily allowance. GI value and carbs are affected by ripeness as the sugar content increases with ripening
My children used to refuse to eat them. But only because they knew if they waited long enough, I would turn them into a banana tea loaf. Warm, spread with butter........... :cry: