Whenever I stress about the price of good, nutritious food, I think about how much money a 5 day hospitalization for, say, chest pain costs (around $30,000 I believe), and I think that food costs are just a drop in the bucket. Plus I tend to feel more emotionally well balanced when I'm eating well, so I figure I'm saving on not doing stupid things like impulse shopping for clothes, too.
Plus, Americans actually spend a smaller percentage of their income on food than any other country (
http://www.motherjones.com/blue-marb...-spending-less). The only reason we think food should be so cheap is because our government subsidizes the calories that make us fat (e.g., corn.) But that's a rant for another day... :-)
Good luck on P1!!