I've heard of a couple studies that say that the unhealthy eating is a result of consumers in the area not having either the time and/or the money to make better decisions. If you're working 2 jobs you may find yourself less able to make healthy decisions. In my more self-imposed case, I know that I wasn't able to eat healthy while pursuing an EE/physics degree while working an engineering internship. I was either sleeping or working and there was rarely time to prepare my own food or even go to the grocery store to get the ingredients.