Corn shows up in a staggering range of products, from the obvious (tortillas, popcorn) to the unexpected (drywall, diapers, spark plugs). In the United States alone, roughly 15 billion bushels of corn are produced each year, and less than a tenth of that ends up on your plate as a recognizable food. The rest is transformed into fuel, animal feed, sweeteners, plastics, textiles, and thousands of industrial ingredients that touch nearly every aisle of a grocery store and hardware store alike.
Food Ingredients and Sweeteners
The most familiar corn-based foods are the ones you can still see the kernels in: fresh corn on the cob, canned corn, tortillas, cornmeal, grits, polenta, and popcorn. But corn’s deeper reach into the food supply comes from what happens after the kernel is broken down into its component parts: starch, oil, protein, and fiber.
Corn starch is the workhorse of processed food. It acts as a thickener in soups, gravies, and sauces, and as a stabilizer in everything from yogurt to salad dressing. When corn starch is further processed, it yields a family of sweeteners. High-fructose corn syrup is the most well-known, used heavily in soft drinks, candy, baked goods, and condiments. Corn syrup (the non-high-fructose variety) shows up in ice cream, caramel, and canned fruit. Dextrose, another corn-derived sugar, sweetens sports drinks and is commonly listed on the labels of processed meats and bread.
Maltodextrins, which are short-chain carbohydrates extracted from corn starch, give dairy products and desserts a creamy texture. Resistant dextrin and soluble corn fiber are increasingly used in functional foods and protein bars as a source of prebiotic fiber. Corn oil, pressed from the germ of the kernel, is a common cooking oil and a major ingredient in margarine and snack foods. Even citric acid, the tart flavor in countless beverages and candies, is typically produced by fermenting corn-derived sugars.
Ethanol and Fuel
About a third of all U.S. corn goes straight into fuel production. In 2023, roughly 5.3 billion bushels were used to make ethanol, according to the USDA. Nearly all gasoline sold in the United States contains 10% ethanol (labeled E10 at the pump), a blend that became standard between 2001 and 2010. Some vehicles run on E15 or E85, which contain even higher proportions of corn-based ethanol.
The ethanol production process also generates byproducts. Distillers grains, the protein-rich leftovers after fermentation, are sold as livestock feed. Carbon dioxide captured during fermentation is used in carbonated beverages, dry ice, and food-grade packaging.
Animal Feed
Animal feed and residual use account for about 45% of total domestic corn consumption. Poultry, swine, dairy cattle, beef cattle, horses, and farmed fish all eat corn-based rations. During the finishing phase, when beef cattle are fattened before processing, corn grain can make up 60 to 85% of their diet depending on the region and feed prices. Over a cow’s entire lifetime, though, corn accounts for only about 7% of its total feed intake because the animal spends most of its life eating grass and forage.
Corn gluten meal and corn gluten feed, both byproducts of starch extraction, are high-protein feed ingredients for poultry and aquaculture. Pet food manufacturers also rely heavily on corn as a carbohydrate and protein source in dry kibble.
Bioplastics and Packaging
Corn starch can be converted into a bioplastic called polylactic acid, commonly known as PLA. You have probably already used it without realizing it. PLA is formed into clear food containers, takeout clamshells, disposable cups, cutlery, 3D printing filament, and even some medical products like dissolvable sutures.
PLA’s appeal is that it comes from a renewable resource and has a smaller carbon footprint than petroleum-based plastic. In an industrial composting facility heated to around 140°F with active microbes, PLA can break down into carbon dioxide and water within about three months. The catch: those conditions rarely exist outside specialized facilities. In a home compost bin, decomposition takes far longer, and in a landfill packed tightly with little oxygen, a PLA bottle could take anywhere from 100 to 1,000 years to break down, not much better than conventional plastic.
Paper, Cardboard, and Textiles
Corn starch plays a critical role in papermaking. It is used as a sizing agent, meaning it coats paper fibers to control how ink absorbs into the surface. Without sizing, printer paper would behave like a paper towel, wicking ink in every direction. Corrugated cardboard relies on corn-based adhesives to bond the fluted inner layer to the flat outer sheets.
In the textile industry, corn starch serves a similar sizing function. Yarn is coated with a starch solution before weaving to strengthen the fibers and reduce breakage on the loom. Cotton fabrics in particular are treated this way. The starch is washed out after weaving, leaving behind a smoother, more uniform cloth.
Pharmaceuticals and Personal Care
If you have ever taken a tablet or capsule, there is a good chance corn starch held it together. In pharmaceutical manufacturing, corn starch serves three roles: as a binder that holds the tablet’s ingredients in a solid form, as a filler that bulks a tiny dose of active ingredient into a pill large enough to handle, and as a disintegrant that helps the tablet break apart in your stomach so the medication can be absorbed. Starch paste at concentrations of 5 to 20% is routinely used during tablet production, and at lower concentrations it speeds up how quickly a tablet dissolves.
Corn derivatives also appear in personal care products. Citric acid produced from corn fermentation is a common ingredient in shampoos, conditioners, and skincare products, where it adjusts the pH. Corn starch itself shows up in dry shampoo, body powder, and some toothpaste formulations, where it works as a mild abrasive to polish teeth and remove buildup.
Industrial Chemicals and Thickeners
Fermentation of corn sugars produces a long list of industrial chemicals. Xanthan gum, the thickener found in salad dressings, gluten-free baked goods, and cosmetics, is made by fermenting corn-derived sugars with a specific bacterium. Corn steep liquor, a byproduct of corn wet milling, serves as a nutrient source for many fermentation processes.
Lactic acid, another corn fermentation product, is used in food preservation, biodegradable solvents, and the production of PLA plastic. Corn-derived ethanol also serves as a base for industrial solvents, hand sanitizers, and cleaning products.
Surprising Household and Construction Uses
Corn’s binding properties make it useful in places you would never expect. Drywall, the standard material for interior walls, uses corn starch as a binding agent and texturing component to create a smooth, strong finish. Fireworks rely on corn starch’s dextrin to hold the explosive components together in precise arrangements until the shell detonates.
Spark plugs contain a corn-derived ceramic insulator. Because corn can be processed into a material with a very high melting point, it protects the plug from overheating under extreme engine temperatures. Diapers use corn starch as a binding agent to hold the structure together, along with a corn-based superabsorbent gel that can soak up many times its own weight in liquid.
Even crayons, batteries, and matchsticks contain corn-derived components. Corn starch acts as a binder or filler in each case. The adhesive on envelopes and postage stamps has historically been corn-based as well. When you factor in all these applications, a single ear of corn is connected to an industrial supply chain that stretches from your gas tank to your medicine cabinet to the walls of your house.