Weird History Food is taking you on a Junk Food trip, through each decade, to see what were the most popular foods and snacks. The most impressive aspect of junk food developed throughout the 20th century is just how many of the inventions stuck around. Before the Industrial Revolution, most of what we would now consider “junk food” was made at home on a small scale. While the invention of the steel mill and steam power was certainly useful and revolutionary, the more whimsical effects of the societal overhaul are worthy of analysis as well. The developments in food science expanded while mass production grew more sophisticated, enabling the American public to experience a wide array of new snacks.