Or.. you could do both. Personally, I eat mostly all-natural/organic foods because my wife is an organic food nazi. However after a while of living this lifestyle I do think it's a positive change. But does this mean I don't want to help others who may be afflicted by these diseases? Not at all. There's no way everyone in the world will just magically change the way they do things, we have to be realistic not just idealistic.

It's kind of like saying I don't want to try and keep animals from going extinct because we need to change peoples behavoirs who hunt them for profit. Some things are in our sphere of influence or control, and some things are not. If you really want to be a righteous person, influence what you can instead of diffusing your responsibility to a level you can't control.