My overall food bills went down when i gave up junk food - soda, chips, candy at the gas station are expensive. Yes, the weekly "at the super market" bill probably went up a bit because I was buying more fruits and veggies. But I never bought my junk food at the super market anyaay, those costs snuck in every day at vending machines and every time i got gas.
However my food bills went back up when I decided to try to eat only organic (and for meat/dairy/eggs - only local, pasture raised). But it's a cost I can currently afford. It still is probably cheaper than my junk food addiction...
"Vision without action is a daydream ~ Action without vision is a nightmare"