If banana skins were poisonous to pigs Meg would've died long since. Bananas are her absolute favourite food, she eats them whole. She will eat an empty banana skin in preference to pig nuts. We buy any reduced bananas we see for her, she eats a lot of bananas and banana skins...
She doesn't like orange peel, she peels oranges with her snout and eats the flesh but leaves the skin.