The U.S. Dept. of Health and Human Services and the U.S. Dept. of Agriculture have jointly published Dietary Guidelines for Americans every five years since 1980. The Guidelines provide authoritative advice for people two years and older about how good dietary habits can promote health and reduce risk for major chronic diseases. They serve as the basis for federal food and nutrition education programs. HHS and USDA issued the most recent revision on January 12, 2005. Here’s a discussion of the D…