Hmm... the rats demolish an egg in one sitting, the only thing I can see adding up to bad fats is the yolk. Maybe throw that away and let them eat the whites only so you can give them an egg twice a week. They liked them fried up too, but then you would have to seperate it before you cook it. I like to give it specifically to the pregger rats, they go crazy for them, rolling them all around trying to get in. lol, its good stuff. I just dont know how much mice eat.