Okay, so I know that balls will fast for a while in the winter, and I shouldn't be too concerned, BUT:
Mine is less than 2 years old, and the "fast" has lasted since late November.

He used to eat great for me, but he stopped around Thanksgiving. I didn't worry about it too much since the temp was dropping, but I'm starting to get concerned since he's become noticeably "squishier" and has lost some weight.

When they're fasting, do they tend to still exhibit "hunting" behavior? Before, whenever he would sit with his head out of the hide in the "S", he would eat. Now he'll sniff the mouse, but jump back suddenly.

My temps are good, 92 hot side, and about 85 cool, humidity around 50 most of the time. And he's shed twice since he's stopped eating, and pooped once, but peed a few more times.

Any ideas, or am I just being paranoid?