The FAO Food Price Index is a measure of the monthly change in international prices of a basket of food commodities. It consists of the average of five commodity group price indices (representing 55 quotations), weighted with the average export shares of each of the groups for 2002-2004. In February, FAO revised the composition of the Meat Price Index. This resulted in adjustments to the historical values of the FFPI.
(more information at link)
Dairy is clearly rising to a greater extent than some other foods.