I only run to the grocery store occasionally and it shocks me to see the price of bread, milk, butter compared to a year or two back. Now my wife is out of town for some time and I went for a full grocery shopping. When I saw the overall prices, I can see why my wife had been complaining about the monthly budget not being adequate.
Color commentary - We also now are just beginning to appreciate why portions are small and wastage is less in other countries where food uses up a significantly higher percent of a family's disposable income. This page has a link to a spreadsheet of world data:
http://www.ers.usda.gov/Data/InternationalFoodDemand/
Of the 9.8% we spend on food, 5.7% is 'at home' and 4.1% is away from home.