I think this is hard to determine right now. I don't know about you guys, but grocery prices have SOAREDin my area. I am spending about $30 per week more to feed my family of 5 than I did a few months ago. I don't blame this on healthy eating, I blame it on prices rising.
In the last year, the same 2 poundbag of shredded cheese has gone fro $5.96 to $11.96 - almost DOUBLE what it cost before. Banannas have gone up .10 per pound. Lettuce has risen almost .50 per head. Eggs, milk, and bread have all gone up as well.
I do have the luxery of having a large freezer. We also raise beef cattle, so we always have very lean beef in the freezer. I live an hour outside of Houston, so we have several grocery stores in the area. My husband sells beef at Farmer's Markets, so we also have the option of buying there.
I do think that location plays a HUGE part in grocery expenses. I also think it is cheaper per person for me to feed my family vs someone who lives on their own, or with just two in the home. I can purchase in bulk (or larger packaged items) before things go bad.
Although my grocery bill is higher, I do think that MY FAMILY spends less while we are eating more healthy. We have leftovers that get eaten vs nothing left, or leftovers going bad. I feel like I can only blame rising costs on our increased grocery bill, not healthy eating.