In reply to The Lemming:
ive never got this argument.
to eat healthy i buy fresh vegetables, whatever meat is on special and bulk buy all the bits to make it taste good (olive oil, herbs, nuts, berries etc). i do the occasional trip to costco for the bulk stuff, but the rest comes from a mid-range supermarket (and i admit theres a small amount from friends who have little farms).
excluding eating out (where we still go as healthy as the situation allows, but we are not monks) its about $12 a day for 2 adults and a baby.
it could be less if we got strict about it, yet to get the same amount of nutrients id need to eat twice as much crap. even if it is cheaper, its not 50% cheaper.
its like saying well i could live off tap water and jelly beans and thats cheaper. well yes it is, but it doesnt actually feed you.
depends what the equation is: fuelling a human body to do stuff, or putting shit in your mouth, chewing and swallowing.
to do the former effectively is the cheaper option. the latter is not the same thing.
to make the equation function it needs a 3rd factor; 'what for?'
to sit at a computer all day and expend 1500kcals, yes, crap will work. but to be active and maintain health wont happen realistically on that.