I know all this was well over 2 years ago but I created an account just to say that there is more nutrition in the skin than in the fruit as with many other fruits.
I slice a banana with the skin on and add it to my smoothie each day.
The bananas I get weigh about 4.5 to 5oz and I'm still not sure about the calories. Never counted before but need to shed some weight now for the first time in my life and had a lot of success with the Every Other Day Diet but my smoothie is way over 500 calories so cannot have it on the 500 days.
Haven't read all the rules so not sure if I'm able to post links but just Google 'banana skin nutrition' and you can all see what I'm talking about
Don't think it would taste that good eating it on it's own but in my beetroot juice based smoothies it's fine.