Cats that are close to humans seem to think that whatever their parents eat must be cat food as well. Whenever I eat something, Filou asks whether he can have it, especially if it is fat or meat: butter, tandoori chicken, pizza, full fat yoghurt. But he also tried avocados, mangoes, olives but not grapefruit. Ok I give him let's say half a gram or so -just because he asks so politely but if it's especially yummy (steak, fish) he also will try to steal his part (stolen food is special ).