But as soon as you've got someone else who needs to eat (cat->eat(), dog->eat()...), it is still better to go with a functional approach:
feed(person, bread)
Basically, my abstraction was bad for that case, but it is so much easier to move from eat(bread) to eat(person, bread) and then rename that to "feed" than to introduce object inheritance/composition and think about the commonality between dog and person if all you want to do is feed them.
Sure, there are cases where purely OOP approach is not burdensome, and may even be easier, but functional approach, as an explicit superset of possibilities, will usually be simpler and more understandable.
