Throughout the 1900s, a number of rapid, important developments led to food processing as we know it today. Just as World War I popularized the tin can at the turn of the century, World War II and the mid-century space race helped accelerate the development of ready-to-eat packaged foods. During this period, the working middle class also began to expand around the world, bringing with it an increased demand for fast food with a long shelf life.
New processes as well as new raw materials and new equipment have contributed to the history of food processing in the 20th century. The use of spray drying, evaporation, freeze drying and preservatives makes it easier to pack and keep different types of food on the shelf. Artificial sweeteners and colors help make these pickled foods more palatable. Home ovens, microwaves, blenders, and other appliances provide an easy way to prepare these meals quickly. Factories and mass production technologies made it possible to produce and package food quickly. These developments paved the way for globally popular foods such as frozen dinners, instant noodle cups, baking powders, and more.