i very much resigned myself to the fact a very long time ago that you can't eat healthy on the cheap. you can be smart, you can look for deals, but you have to pay for food; you can't even grow it, it's not safe in our polluted cities. and, dying young isn't a worthwhile opportunity cost to buy...i don't even know what.
your health is your only worthwhile investment.
and, realizing or not realizing that is really the definition of intelligence and stupidity.
so, i want to minimize costs, sure - but you have to pay for food and you can't get around it.