What does it mean that the mouse is full and hungry?

The diet arrangement of mice (usually used as experimental animals), that is, whether they should be full or hungry.

Rats, like other rodents, have a relatively simple digestive system and mainly rely on the stomach and small intestine to digest food. When mice are full, their stomachs and small intestines will expand to adapt to more food. However, if mice are full, it will have a negative impact on their digestive system.