More than half of all calories Americans consume come from ultra-processed foods. CDC data from 2021 to 2023 puts the figure at 55% for anyone over age one, with children and teens averaging even higher at nearly 62%. That number isn’t an accident. It’s the result of decades of overlapping forces: wartime innovation, agricultural policy, food science, loose regulation, and simple economics.
What Counts as Ultra-Processed
The most widely used framework for categorizing processed food is the NOVA classification system, which sorts all foods into four groups based not on their nutritional content but on how much industrial processing they’ve undergone. Group 1 is unprocessed or minimally processed food: fruits, vegetables, eggs, plain meat. Group 2 covers culinary ingredients like oils, butter, and sugar. Group 3 is processed food, things like canned vegetables, cured meats, and fresh bread made with a short ingredient list.
Group 4, ultra-processed food, is where things get complicated. These products are formulated mostly or entirely from substances derived from foods rather than being recognizable as food themselves. They typically contain ingredients you can’t buy at a grocery store: modified starches, hydrogenated oils, protein isolates, bulking agents, emulsifiers, flavor enhancers, and artificial colors. Think packaged snack cakes, flavored yogurts, instant noodles, soft drinks, and most fast food. They’re engineered to be shelf-stable, convenient, intensely flavorful, and often habit-forming.
World War II Changed What Americans Eat
The roots of America’s processed food supply trace back to the 1940s. During World War II, the military needed foods that could survive long supply chains to soldiers overseas. That demand drove rapid innovation in dehydration, freeze-drying, and chemical preservation. Powdered cheese, instant coffee, frozen juice concentrate, and shelf-stable rations all emerged from or expanded during the war effort.
When the war ended in 1945, the military sat on enormous stockpiles of these engineered foods. The government liquidated them to private industry, sometimes for pennies on the dollar. Companies like Frito, Kraft, and others built consumer products out of wartime surplus. In 1948, Frito coated puffed cornmeal with dehydrated cheese powder, and Cheetos were born. Kraft macaroni and cheese had been invented in 1937, but the war made it a household staple because it was cheap, filling, and required only one ration point for two boxes. Minute Maid’s frozen orange juice concentrate came directly from a 1942 military research project.
Soldiers came home with a taste for instant coffee. Women who had entered the workforce during the war valued speed and convenience in the kitchen. These cultural shifts stuck, and the food industry was happy to meet the demand with an expanding lineup of convenience products that only grew through the 1950s, 60s, and 70s.
Farm Subsidies Make Processed Ingredients Cheap
U.S. agricultural policy has long favored a handful of commodity crops: corn, soybeans, and wheat. Federal subsidies and price supports for these crops have flooded the market with their derivatives, particularly high-fructose corn syrup (from corn), hydrogenated fats (from soybeans), and cheap animal feed that lowers the cost of meat production. Meanwhile, fruits and vegetables receive comparatively little federal support, which critics argue discourages farmers from growing them.
High-fructose corn syrup is a good example of how policy shapes the food supply. Farm subsidies reduce the cost of corn, while tariffs and import quotas on foreign sugar make cane sugar more expensive. The result: HFCS became the default sweetener in American soft drinks, breads, sauces, and snack foods starting in the 1970s, not because it was nutritionally superior but because it was the cheapest option. Some agricultural economists have estimated that without corn and soy subsidies, prices for those crops would rise only 5 to 7 percent. But even that modest difference, multiplied across an industrial food system buying ingredients by the trainload, adds up to billions of dollars in savings for manufacturers.
Processed Food Costs Less Per Calorie
For consumers, the math is straightforward and punishing. Ultra-processed foods cost roughly $0.55 per 100 calories in the United States, while unprocessed and minimally processed foods run about $1.45 per 100 calories. That’s nearly three times the price for the same energy. Over the past decade, that gap has widened: ultra-processed foods haven’t increased in price as fast as whole foods.
For a family stretching a tight grocery budget, this cost difference shapes every trip to the store. A box of flavored cereal, a bag of chips, or a frozen pizza delivers more calories per dollar than fresh produce, lean meat, or whole grains. Processed foods are also more durable. They don’t spoil in a few days like fresh fruit or raw chicken, which reduces waste and makes them practical for households that can’t shop frequently. Convenience, shelf life, and price all push in the same direction.
Food Engineering and the Bliss Point
Ultra-processed foods aren’t just cheap and convenient. They’re specifically designed to be difficult to stop eating. Food scientists use a concept called the “bliss point,” a term coined by American market researcher Howard Moskowitz, to describe the precise combination of sugar, salt, and fat that a consumer perceives as “just right.” Formulations are tested and adjusted until they hit this sweet spot of maximum palatability.
Texture plays an equally important role. When manufacturers added a crunchy mouthfeel to bliss-point formulations, they created an entirely new category of “craveable” foods. The combination of optimized flavor and engineered texture makes these products more stimulating to eat than most whole foods, which have more subtle and varied sensory profiles. This isn’t a conspiracy theory. It’s standard practice in product development, openly discussed in food science literature and by industry professionals.
Regulation That Favors Manufacturers
The U.S. regulatory system gives food manufacturers unusual latitude in deciding what goes into their products. Under federal law, any substance intentionally added to food is technically a food additive that requires pre-market review and approval by the FDA. But there’s a major exception: if a substance is “generally recognized as safe” (GRAS) by qualified experts, it bypasses the FDA approval process entirely.
In practice, this means companies can determine on their own that an ingredient qualifies as GRAS, using their own panels of experts, and begin using it in products without notifying the FDA at all. The agency maintains a voluntary notification program, but participation isn’t required. Thousands of substances have entered the food supply this way. The European Union, by contrast, requires pre-market safety assessments for food additives and has banned or restricted dozens of ingredients that remain legal in U.S. products. This regulatory gap helps explain why American processed foods often contain longer and more complex ingredient lists than their counterparts in other countries.
Scale and Infrastructure Lock It In
All of these forces reinforce one another. Subsidies lower ingredient costs. Low costs make processed food the most profitable product category for manufacturers. Profits fund food science research that makes products more craveable. Craveable products sell well, which justifies more investment in processing infrastructure. That infrastructure, from industrial kitchens to distribution networks optimized for shelf-stable goods, becomes the backbone of the food system.
Grocery stores reflect this reality. The center aisles are filled with ultra-processed products that have long shelf lives and high profit margins. Fresh foods are pushed to the perimeter, where they require refrigeration, more frequent restocking, and absorb more spoilage loss. Fast food and convenience stores, which dominate many lower-income neighborhoods, lean even more heavily on processed options because they’re cheaper to source, easier to store, and faster to prepare.
The American food system didn’t become this processed overnight, and no single villain explains it. It’s the accumulated result of wartime necessity, farm policy, corporate incentives, regulatory permissiveness, consumer budgets, and food science all pulling in the same direction for the better part of a century.