Keep in mind that if you already have some jumbo mice on hand, you don't necessarily need to throw them out, but just don't feed them all the time. It's perfectly fine to change up the prey from one meal to the next- maybe feed a jumbo mouse just once in a while (with leaner meals in between) until you use them up (& I'm hoping you don't have a huge supply, lol). In human terms, it's like having a BIG MAC* now & then, but not every day for your own best health. (*just a fast-food example- I'm not picking on McDonalds)