If someone used to the stress of living each day in fear of physical danger and failure to meet basic needs would probably see a stress reduction and health improvement in university life, wouldn't you?
My point is that going against the social milieu causes physical damage to the body, I suppose because you are in actual rebellion against the social system in which you are born and raised.
There's an actual study on this matter, I just don't know where it is.
Harvard is looking for people who are most likely to bring glory and massive future cash flow to Harvard.
If they had to give everyone free rides to do this, they probably would, but that's not reality, so they don't have to.