I feed Hissy two or three smaller mice at a feeding at this time. This is because I was advised initially to feed her small mice when I first got her. I was not informed on the benefits of rats. Recently though (her last two feedings) even when I put three mice in her tank, she only eats one. She is healthy as all get out. She has good muscle tone. She has gained a significant amount of weight since I got her. (When I got her she was underweight) She sheds perfectly & she has calmed an unbelievable amount since I got her. (The whole post shed issue has been laid to rest because we had a pleasant father/daughter handling session last nite) She sheds perfectly as well. I dunno, I mean, she seems incredibly happy & healthy. I am getting some rats, so I think that i will probably take a look at the size of the rats & maybe give her a variety of foods between the mice & the rats. We shall see, it should be interesting.