Attempting to trick mine into thinking it's still summer, neither have gone off feed yet, but they're eating a little less each day. I'm not too worried though. They've been perfectly healthy, giving only perfect sheds in all the month's I've owned them, and the male was off feed for quite awhile last winter. We'll see how it goes, though, I'm going to start being careful how many ratties I buy them so I'm not left over with useless dead rodents.