Hunger is one of the hidden values all slimes have which determines which standard facial expression they will assume also in relation to their agitation values.
The Hunger mechanic dictates whether or not the slime will seek out and attempt to eat food. A fully fed and happy slime will have an open mouth expression, internally referred to as "Elated", and will not seek out food. After 6 in-game hours from its last feed, its facial expression will decay to a closed smile, "Happy"; it is at this point it will begin seeking out food. If it continues going without feeding, its facial expression will decay further to a grumpy face, "Angry", and finally enter a starving state, "Starving". A slime can go into a starving state in around 18 hours, and a starving pure slime will eat three pieces of food before it is satisfied regardless of whether the food is its favorite, and a Largo will eat two.
Eating food lowers a slime's agitation, so keeping a slime fed is the most guaranteed way to avoid negative behaviours from occurring.
Feral Slimes will always eat food regardless of hunger, and will obey their own hunger value once they have been calmed; so a fully fed feral slime will eat to calm down, but not immediately after.
Gordo Slimes are a special case and will consume all foods in its diet until burst.
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Trivia
- A feral slime will always eat regardless of hunger, and a Hunter Largo can go feral when highly agitated. It is possible to force them to go feral by shooting Fire Slimes at them, then feeding them again to calm them down to produce more plorts.
- Gold Slimes and Lucky Slimes are susceptible to hunger and agitation like any other slime. Due to the nature of their rarity and despawning mechanics, this does not normally come into play under normal circumstances.