Food cannot have less than 1 hunger.

[Modin]

Any food item that gives less than 1 hunger disappears instantly. No matter how much hunger it started with (gum with 1 or lollipop with 5), if you eat it partially and the hunger that it gives drops below 1, the item will disappear from your inventory and the rest of the hunger will not be gained.

 

Example, have a worm in your inventory. Eat half of it. It's gone. But you only gained half a worm worth of hunger: 1.

 

Have a gum in your inventory, start eating it but instantly cancel with ESC. The gum disappears and you barely gained anything.