The Fullness lobe is a brain lobe developed by evolnemesis. It creates a total for all three hunger drives and if the total is low (the norn is not particularly hungry for anything), it activates a neuron with a strength which indicates how full the creature is. A brain tract then conveys this information to the combination lobe, making the action of eating less desirable the stronger the feeling of fullness is.
Evolnemesis explains this as similar to how the friend or foe lobe makes the action of tickling less desirable when the creature is with a creature they dislike, and makes hitting less desirable for creatures that they like.
The Fullness lobe is implemented in the Creatures Full of Fixes.
A prior structure was developed in the Enhanced ChiChi Norn.