I try to very a lot, bananas, mangos and papayas are the most frequent ones, also apples, pears, melons, oranges, lime and pineapple, or anything else I can find. Well seems like most fruits have protein, bananas seems like a good source, I'm no expert. I don't fell hungry at all, I fell a desire to satisfy my taste only, sugar and salt are kind of addictive I think