I'm fairly certain in some cultures (not sure if it's true anymore) that the placenta was eaten by the mother after birth largely because it contains a great deal of nutrients and the mother was in need of them.
That being said, I guess we know where all the forced sterilization babies end up in China. Just doesn't happen to be where most of us expected them.
I recall someone did a study in my school on our rowing team, and found that people who were receiving negative feedback (i.e. choice A) did better on their 2,000 meter row than those who were encouraged (i.e. B).
This obviously only applies to certain people in certain situations, but food for thought