With the Hunger-System is based on saturation. Tghe saturation is a value between 1 and 100, where 100 is the best and 1 is the worst.
After a periodic amount of time (can be set with the MyPet.HungerSystem.Time setting) the saturation decreases and affects other stats of your pet.
When a pet respawns it doesn't has full hitpoints when the Saturation is below 90.
This tables shows how much the saturation affect the hitpoints on a respawn:
|Hunger-Points||Hitpoints on respawn|
The lower the saturation the less is the range of the beacon effect.
The lower the saturation the slower your pet will run when you ride it.