Interesting, well as it's no longer an issue, here's the answer that people were trying to keep from sdn.
From the bender guy:
I'm entering Ohio State as a Med 1 this August. I was intrigued by this question (as it wasn't a question for us last year), so I went and talked to the admissions committee people about why they choose it and what the purpose of the question was.
Basically, there are a few applicants (you would be surprised) that don't really understand the problems of the world beyond their daily issues. They don't know about starvation, epidemics, or water shortages, let alone relatively 'minor' inconveniences such as poverty, lack of living space, and lack of education. There's another category of people that understand that these problems exist, yet refuse to acknowledge that it's their responsibility and duty to do something about it. After that, there's a group of individuals that understand these problems and understand that something must be done about them, but haven't yet done anything themselves. Lastly, there's a few people out there that may or may not have actually faced this issues themselves, but definitely have a in-depth understanding of the afflictions of poverty and the social injustice associated with having been born into a much poorer situation than the people (such as us) that live life in great comfort in developed countries. This last group has also done something, anything, to shift the balance, from sending food packages to other countries to volunteering their time to help create a better living situation for impoverished people, and so on.
You need to show that you're in the last group. You need to be able to articulate the fact that you understand that life isn't the same for a whole lot (and I mean a WHOLE lot) of other people in this world, and, more importantly, that you, in your condition as spoiled residents of the world's richest country (that's what we are) have done something about it. Because face it, even an incredibly busy undergraduate (which is what I assume most of you are applying from) still means that you have much more free time than the average medical student or resident; and, if you haven't done anything to show that you're committed to helping other people in your free time as an undergrad, you're not going to be able to suddenly start when you're much busier with other things in your life.
Hope this helps, and best of luck to all of you. Let me know if you have any other questions, and I'm sure you'll all make fantastic physicians one day!