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ERS has new data on food inflation: http://www.ers.usda.gov/Briefing/CPIFoodAndExpenditures/Data/CPIForecasts.htm
Dairy shows some increase in costs but, not as much as meat. Anyone can practically live on dairy. However, George Orwell noted some time ago in The Road to Wigan Pier, regarding the life of the British working poor:
The basis of their diet, therefore, is white bread and margarine, corned beef, sugared tea and potatoes -- an appalling diet. Would it not be better if they spent more money on wholesome things like oranges and wholemeal bread or if they even, like the writer of the letter to the New Statesman, saved on fuel and ate their carrots ? Yes, it would, but the point is that no ordinary human being is ever going to do such a thing. The ordinary human being would sooner starve than live on brown bread and raw carrots. And the peculiar evil is this, that the less money you have, the less inclined you feel to spend it on wholesome food. A millionaire may enjoy breakfasting off orange juice and Ryvita biscuits; an unemployed man doesn't.… When you are unemployed … you don't want to eat dull wholesome food. You want something a little bit "tasty." There is always some cheaply pleasant to tempt you.
All of which leads to Coke's annual report: http://www.thecoca-colacompany.com/investors/pdfs/form_10K_2010.pdf
A snip can be seen above. Coke had a reduction of 3%, 2008 vs 2009.
then look at: http://usda.mannlib.cornell.edu/usda/current/MilkProdDi/MilkProdDi-04-27-2011.pdf
On page 6 you will find dairy farms lost 30% in the same 2008 - 2009 period.