I'm also allergic to banana. It's an allergy that has got steadily worse over the years. I used to be able to eat it without problems, then it started to leave me with an itchy throat, but if it was cooked I'd be fine... eventually even cooked banana left me itchy and it's now progressed to the point where I can't even touch a banana without reacting. Eating a grape that had been in a bag with a banana once gave me a pretty nasty esperience with feeling that my throat was closing up... I'm pretty sure it would be life threatening now if I were to eat one.

I'm also allergic to rockmelon in the same way, and kiwi fruit seems to be following. Fortunately we discovered the rockmelon allergy when I'd been chopping one up rather than eating it. My hands became very red, swollen and itchy. Please tell your friend to be extremely careful when introducing other fruits!

BW