Only a small percentage of Americans eat a nutritious diet. A Harvard professor weighs in on his ideas about what we need to do to improve the American diet. Aired Oct. 8, 2010 [18:38]

National Public Radio talks with Dr. Walter Willett, Harvard MD and nutritionist, about changes that need to be made in the 1992 US Food Guide Pyramid. Interesting as an introduction to this topic, with links to related stories.