The first half of the 20th century saw extraordinary changes in the ways Americans produced, procured, cooked, and ate food. Exploding food production easily outstripped population growth in this era as intensive plant and animal breeding, the booming use of synthetic fertilizers and pesticides, and technological advances in farm equipment all resulted in dramatically greater yields on American farms. At the same time, a rapidly growing transportation network of refrigerated ships, railroads, and trucks hugely expanded the reach of different food crops and increased the variety of foods consumers across the country could buy, even as food imports from other countries soared. Meanwhile, new technologies, such as mechanical refrigeration, reliable industrial canning, and, by the end of the era, frozen foods, subtly encouraged Americans to eat less locally and seasonally than ever before. Yet as American food became more abundant and more affordable, diminishing want and suffering, it also contributed to new problems, especially rising body weights and mounting rates of cardiac disease. American taste preferences themselves changed throughout the era as more people came to expect stronger flavors, grew accustomed to the taste of industrially processed foods, and sampled so-called “foreign” foods, which played an enormous role in defining 20th-century American cuisine. Food marketing exploded, and food companies invested ever greater sums in print and radio advertising and eye-catching packaging. At home, a range of appliances made cooking easier, and modern grocery stores and increasing car ownership made it possible for Americans to food shop less frequently. Home economics provided Americans, especially girls and women, with newly scientific and managerial approaches to cooking and home management, and Americans as a whole increasingly approached food through the lens of science. Virtually all areas related to food saw fundamental shifts in the first half of the 20th century, from agriculture to industrial processing, from nutrition science to weight-loss culture, from marketing to transportation, and from kitchen technology to cuisine. Not everything about food changed in this era, but the rapid pace of change probably exaggerated the transformations for the many Americans who experienced them.