Hmm, could be true I suppose. Or your husmbandry could be off. I have 3 ball pythons right now, after downsizing, and they all eat evevry week, all winter. Hmmm, so how do you explain that? They don't know it is winter. It is 79 degrees in the snake room, they have hot spots of 90 degrees. The humidity is around 65-70% on average. It is EQUATORIAL conditions, like where their natural habitat. They have no reason to fast, so they don't.