A lot of posters on this site have said that it is bad for cats to have too much liver, but why? I have found a food that my very picky dry food addict IBD kitty loves, but it is duck and duck liver. She is only supposed to have duck and hates the "loaf" style food. This food consists of little pieces. Should I not feed this food too often and stick more to the dry duck food that she also likes and tolerates and does not contain liver?