Ken Meter, with the Crossroads Center in Minnesota, has compiled some wonderful facts regarding food markets. Here is one such fact:
" Annual cost of energy used in food system (production, processing and distribution), at current consumption rates (2005): $139 billion."
And here is how Ken figure this out, as noted in the footnotes:
"Calculated from ratio determined by FEA study cited above, using current Department of Energy data for energy consumption ($694 billion in 2001 -- DOE Table 1.5 Energy Consumption, Expenditures, and Emissions Indicators, 1949-2004, http://www.eia.doe.gov/emeu/mer/consump.html, viewed Nov. 27, 2005). Bureau of Labor Statistics data on consumer expenditures for food, ftp://ftp.bls.gov/pub/special.requests/ce/standard/2004/region.txt, viewed February 7, 2006."
Source: Ken Meter, "U.S. Food Market Highlights", Crossroads Center, rev. Sept. 5, 2006, http://www.crcworks.org/foodmarkets.pdf