100gm honey contents 80gm of suger and 100gm banana contents 15gm suger. The effect of any food item on our body is depends on how much quantity and frequently we are eating that food item. If you are consuming honey and banana in large amount daily you are prone to increase blood suger level.
According to ayurveda diabetes
is disease of kapha dosha. Banana increases kapha in body. So eating banana daily in large quantity can raise you suger.