The Department of Agriculture (USDA) and the Department of Health and Human Services (HHS) may soon be telling you what you should eat to reduce your “carbon footprint.” In order to—ostensibly—prevent global warming and reduce our national carbon footprint, Washington is already telling Americans what light bulbs they can buy, and what buildings in which they should want to live and work. Now, food could be the next frontier. Currently, the USDA and HHS are drafting their 2015 Dietary Guidelines. Every five years, the USDA and HHS issue recommendations for Americans on what constitutes a healthy diet. As Dr. Barbara...