Ed, if you know of good urban gardening resources, feel free to post them. While I'm not really in an urban area, I'm taking ideas from urban gardening as well as rural gardening concepts.
We do have to balance our foods. Of course, a frozen pizza is sometimes what works best in our lives. Ed, like you, I had a frozen pizza today. On it went onions from either the CSA I'm in or the farmer's market, tomatoes from the back yard, and bell peppers from somewhere, I think the back yard.
Rita, to your first point, I think this is something that has to culturally change. Preparing and cooking a healthy meal should be the most valued skill in the household. I know it isn't always but it should be.
To your second point, some farmers are paid very poorly. Corporate farming is big money business, largely because of subsidies. What I'm saying is let's turn those subsidies around. Instead of giving subsidies that lead to huge profits for growing unhealthy food sources while we leave those growing healthy food sources scraping by, let's turn it around and give subsidies that lead to respectable profits for growing healthy food sources while leaving those growing unhealthy food sources to their own devices. This would do two things. First, it would moderate prices of food to where you don't pay a premium to buy healthy food. Second, it would encourage more farmers to grow healthy foods and discourage some from growing unhealthy foods.
As for those quick foods, sometimes they are necessary. We try to have healthy quick snacks around to hold us over until a healthy meal can be cooked but, of course, at times the quick meal is the best option. I don't think anyone is talking about banning frozen pizza, just not relying on it so heavily.