Nothing more to add other than a comment about the thing Nina said about the acid in the fruit may be too much for his stomach -
No way, basically, no fruit is ever gonna be as acidic as the digestive juices in his stomach which is pH 1-2 (million times more acid than water!).
This kinda thinking stems from old wives tales. I was fed the same stuff as a child. I LOVE brown sauce and, esp as a child, would have it with EVERYTHING - dad would often say to me that it would "eat away the lining of my stomach" to try and scare me and left a dirty penny in it overnight to demonstrate - of course, penny would've come out shiny if it'd been left in stomach acid too :roll:
Anyway, just thought I'd mention this