I have spent $550 this month on food to feed my family of 7.
We did not need to buy grains, beans or meat because we had those stocked up according to my system of spending 1/5 of my grocery budget on bulk items. I have not bought my bulk yet, so that will be another $200 or so on top of my $550.
It is almost the end of the month and we still have food in the cupboard. I may have to get a few things before the end of the month, but I'd say that this proves (to me at least) that it is not too expensive to eat a Whole Foods Diet!
Oh, and we only ate things out of my Whole Foods Binder System to accomplish this. :)