Dnt worry.
I hv a frnd who worship lord vishnu and keep fast on thursday,she only eat sweet fast dishes like yellow sweet puri in the evning,and no salt and banana on thursday.bt at one thursday she becom weak and eat namak vali khichdi,i alert her bt she said 'i also part of shri vishnu,i am her daughter,and he knw that her daughter is unable to control,so i hv no worry abt that.and every thng was ok..
So nitinsuper ji u ate banana unknwngly.say sorry to him and do not worry
It was god's wish and u realized..god also knw it was done unkwngly..we r his child..he lv us..dnt be affraid...