Eating locally can do a lot to cut down on energy usage in the food system. But not for the obvious reason – savings on transportation energy. Rather, it’s mostly because you’d be eating real food. That’s the lesson to be gleaned from the report Energy Use in the US Food System, published by the United States Department of Agriculture (USDA).
Energy is used throughout the U.S. food supply chain, which is divvied up into seven stages: farm production and agribusiness (agriculture), food processing and brand marketing (processing), food and ingredient packaging (packaging), freight services (transportation), wholesale and retail trade and marketing services (wholesale/retail), away-from-home food and marketing services (food service), and household food services (households).
The processing stage seems to be where most of the low-hanging energy-saving fruit is to be found. Michael Bomford in an article titled Beyond Food Miles at Post Carbon Institute explains:
Buying from the local farmers’ market offers great opportunities to cut down on food system energy use, but it’s not because the food there has traveled less than the food at the grocery store. It’s because the aisles of a typical grocery store are mostly filled with highly-processed and packaged food, while farmers markets offer mostly whole or minimally-processed foods.
The energy intensity of our food system keeps getting worse rather than better. During 1997-2002, per capita energy use in the United States declined 1.8%, while per capita food-related energy use in the United States actually increased by 16.4%. As a share of the national energy budget, food-related energy use grew from 12.2% in 1997 to 14.4% in 2002 and is still growing, from 14.4 percent in 2002 to an estimated 15.7% in 2007.
Transportation is a small fraction of the food system energy budget.

However, the energy intensity of food transportation in the U.S. food system is growing. Food shipments are increasing in volume, at the same time average shipping distances are increasing significantly. These food-mile increases translate into substantial growth in energy use by food-related freight services.
A big culprit in the increase in energy usage in the food system is replacing human labor with machines. About half of the growth in food-related energy use between 1997 and 2002 is explained by a shift from human labor toward a greater reliance on “energy services” across nearly all food expenditure categories. The report blames “high labor costs” in the food services and food processing industries, combined with household outsourcing of manual food preparation and cleanup efforts through increased consumption of prepared foods and more eating out. Replacing humans with machines is also responsible for the increasing energy intensity in the “agriculture” stage.
Household operations – which is defined to include energy use for major kitchen appliances, auto use for food-related trips, and related energy flows for home food preparation and serving equipment – account for the highest food-related energy use. But food processing shows the largest growth in energy use, as both households and foodservice establishments increasingly outsource manual food preparation and cleanup activities to the manufacturing sector, which rely on energy-using technologies to carry out these processes.
The obvious way to cut down on energy usage in the food system is to cut out as many of the intermediate stages between “agriculture” and “household” as possible: buy directly from the farmer, cutting out processing, packaging, transportation (remember, your trip to the farm is already included in “household”), wholesale/retail, and food service entirely, or at least as much as possible. If we want a more energy-efficient agriculture we will have to reverse the historical trend and begin to once again employ people rather than machines.
Michael Pollan sums up everything we need to know about food and health in seven words: “Eat food, not too much, mostly plants.”
“Eat food” means to eat real food – vegetables, fruits, whole grains, fish, and meat, too, as livestock are an essential component of an ecologically sustainable food system. Eating food would not only be healthier for us. It’s the only means to a healthy economy and a healthy planet.