In the United States today, how and what we eat--with all of its myriad ethnic varieties and endless choices--is firmly entrenched in every part of our culture. The American diet underwent constant evolution throughout the 20th century, starting from the meat-and-potatoes fare of the early-20th century and maturing into a culture that embraced the cuisines of immigrant populations, fast-food chains, health fads, and emerging gourmet tastes. Societal changes moved women out of the kitchen and into the workforce, spawning the invention of convenience foods and time-saving kitchen appliances....