If you overeat the character should feel a short period of happiness but after that a steep slope into depression and no energy.
If the character does interment fasting for a few days the intelligence and perception should be buffed, but too much of it should lead a into depression that debuffs all the attributes.
If the character does some meaningful job like has milked all the cows and done all the farming, then the character should be happy.
If the character has finished building something, it should also boost the mood.
If the character is doing a lot of walks into the nature like foraging, it should boost the mood.
If the character kills a bear or some other wild creature, it should boost the mood.
If the character has depressive mood, all work should take 5x the stamina of usual.
Happy levels should boost the attributes.
Any more ideas?
Illustration for inspiration:
