If you feed your character something that'd make them have +110% hunger they'll comment on how they're full. They'll also receive a debuff that slows them down.
This mechanic would:
1. Encourage people to use more diverse methods of healing (which would mean that new content being a healing item wouldn't be frowned upon)
2. Give Klei more space to work with when designing characters. Minor perks linked to overeating.