This is a simple plugin that keeps your players hunger after they die,this forces player to eat food rather than to just kill themselves to gain hunger.
Per-World-Hunger: true Per-World-Hunger-in: world: true world_nether: true world_the_end: true
The above list will automatically add all your worlds. To make your world so up please add the plugin then start the server and then edit the config and reload the server for the changes you made in the config to be ineffect.
Source