The federal government has issued Dietary Guidelines for Americans seven times since 1980, but the 2005 whole-grain recommendation was the first instance in which consumers were given a specific dietary target, that whole grains should be at least half of their grain consumption. Anecdotal...

Since the early 1990s, the retail market for leafy green vegetables has been divided between largely unprocessed products and bagged salads. The latter embody kitchen labor and economize on storage costs, in effect offering consumers convenience as a product attribute. Using time-series retail...