«While organic systems used less energy, they had higher land use, did not offer benefits in GHGs, and tended to have higher eutrophication and acidification potential per unit of food produced. (climatenewsnetwork.net)
In the United States, it takes about 10 units of fossil energy to produce one unit of food energy. (gracelinks.org)
Although this terminology might sound confusing, the important thing to understand is the calories listed on food labels are in units of food calories or kcals. (healthyeating.sfgate.com)