I guess because of how they digest food, even one large meal can trigger a growth spurt! As soon as I bumped up Toby's meal size, he went into his first shed (since I got him). Yesterday Delilah ate one F/T adult mouse, and literally within hours started to peel her skin. I thought she was getting sick at first, because she was rubbing her head on the ground... then I saw a little skin peeling off, and realized she was starting the shed.