U.S. Census Bureau Daily Feature for March 15 -- WASHINGTON, March 15, 2013 /PRNewswire-USNewswire/ -- WASHINGTON, March 15, 2013 /PRNewswire-USNewswire/ -- Following is the daily "Profile America" feature from the U.S. Census Bureau: Profile America - Friday, March 15th. A number of various causes are recognized in March. Two of these seem to go hand-in-hand - National Nutrition Month and National Frozen Food Month. The goal of the first is make consumers aware of just how easy it is to eat healthy meals. And one of the ways this is possible is because of frozen food. Developed by Clarence Birdseye , the first commercially available frozen food was fish in 1925. Frozen food became increasingly popular as refrigerated freight trains and trucks were able to carry it to all parts of the nation. Today in the U.S., packaged frozen food wholesalers sell $57 billion worth of heat and eat products. Sources: 2007 Economic Census, NAICS 42442