Genetically engineered food comes from plants or animals whose DNA has been changed using laboratory techniques that couldn’t happen through traditional crossbreeding or natural processes. In the U.S., more than 90 percent of corn, cotton, and soybeans are already grown from genetically engineered seeds, which means most people eat products made from these crops regularly, often without realizing it.
How It Differs From Traditional Breeding
Farmers have been crossbreeding plants for thousands of years, selecting for traits like bigger fruit or hardier stalks. That process relies on shuffling genes within the same species or closely related ones through pollination and selective planting over many generations. Genetic engineering skips that slow process entirely. Scientists identify a specific gene responsible for a desired trait, then insert or edit it directly in the organism’s DNA using laboratory tools.
The key distinction is precision and origin. Traditional breeding mixes thousands of genes at once and hopes for a good outcome. Genetic engineering targets one or a few genes, and those genes can come from a completely unrelated organism. A well-known example: insect-resistant corn carries a single gene from a soil bacterium that produces a protein toxic to certain pests. No amount of crossbreeding between corn and bacteria could produce that result naturally.
What Happens in the Lab
The older method of genetic engineering, often called transgenic modification, involves taking a gene from one organism and inserting it into another. Scientists have long used a natural soil bacterium as a delivery vehicle to transfer new DNA into plant cells. Once the foreign gene integrates into the plant’s genome, the plant produces a new protein it couldn’t make before, like the pest-killing protein in Bt corn or an enzyme that lets soybeans survive herbicide sprays.
Newer techniques work differently. The most prominent, CRISPR, acts like molecular scissors. It uses a short piece of RNA as a guide to find a precise location in the organism’s DNA, then an enzyme cuts the strand at that exact spot. Scientists can disable a gene, tweak it, or insert a new sequence at the break point. This approach is faster, cheaper, and more precise than older methods. In some cases, researchers deliver the editing tools directly as proteins rather than DNA, meaning no foreign genetic material remains in the final plant.
Why Foods Are Genetically Engineered
Most genetic engineering in agriculture targets two practical problems: weeds and insects. Herbicide-tolerant crops are designed to survive weed-killing chemicals that would otherwise destroy the crop along with the weeds. This lets farmers spray their fields more efficiently. Insect-resistant crops produce their own pest-targeting protein, reducing the need for external insecticide applications. In 2025, about 92 percent of U.S. corn acres were herbicide-tolerant, and 87 percent carried insect-resistance traits. Roughly 84 percent of corn and 87 percent of cotton were “stacked,” meaning they carried both traits at once.
But pest control isn’t the only goal. Some engineering aims to improve nutrition. Golden Rice is engineered to produce beta-carotene, the orange pigment your body converts into vitamin A. Standard white rice contains none. The latest version of Golden Rice contains up to 35 micrograms of beta-carotene per gram of dry rice, enough that a single 100-gram serving could supply 80 to 100 percent of an adult’s estimated daily vitamin A requirement. It was developed specifically for populations in rice-dependent regions where vitamin A deficiency causes blindness and weakened immunity in children.
Other modifications prevent browning in apples and potatoes, reduce bruising during shipping, or alter the oil profile of soybeans for healthier cooking oil.
Genetically Engineered Animals
Genetic engineering isn’t limited to crops. The FDA has approved AquAdvantage Salmon, which is engineered to reach its market weight faster than conventional Atlantic salmon. It carries a growth gene from a Pacific Chinook salmon and a promoter sequence from an ocean pout, an eel-like fish, that keeps the growth gene active year-round instead of only during warm months.
The FDA has also approved the GalSafe pig, engineered to be free of a sugar molecule called alpha-gal on its cell surfaces. People with alpha-gal syndrome, a tick-triggered allergic condition, react to this sugar when they eat conventional red meat. The GalSafe pig gives them a pork option that doesn’t trigger that reaction. The FDA determined that both the salmon and the pig are as safe and nutritious as their conventional counterparts.
What the Safety Evidence Shows
People have been eating foods made from genetically engineered crops for decades, and the scientific evidence on their safety is extensive. The National Academies of Sciences, Engineering, and Medicine reviewed the cumulative research and concluded there is no validated evidence that foods made from genetically engineered crops are less healthy than non-GMO foods.
One of the strongest lines of evidence comes from comparing health trends in North America, where these foods are widespread, with trends in Europe, where they are rare. Researchers found no differences in rates of cancer, obesity, diabetes, kidney disease, gastrointestinal problems, celiac disease, autism, or food allergies between the two populations. Laboratory and farm animal feeding studies have reached the same conclusion. No single study can prove zero risk for anything, but the weight of evidence across many studies and many years has not identified a health concern specific to genetic engineering.
How GE Foods Are Regulated in the U.S.
Three federal agencies share oversight of genetically engineered foods under a framework established in 1986 and most recently updated in 2017. The USDA evaluates whether a new engineered plant poses risks to other plants or agriculture. The EPA regulates crops engineered to produce pest-targeting substances, treating those substances similarly to pesticides. The FDA oversees food safety, ensuring that engineered foods are as safe and nutritious as their conventional versions.
This three-agency system means a single product can be reviewed by multiple regulators before it reaches the market, each looking at it from a different angle.
Labeling Rules
U.S. law now requires disclosure of bioengineered ingredients under the National Bioengineered Food Disclosure Standard. “Bioengineered” is the official legal term Congress chose, though “GMO” and “genetically engineered” still appear on many packages voluntarily. Mandatory compliance began on June 23, 2025.
Food manufacturers, importers, and certain retailers must label products that contain detectable genetic material modified through laboratory techniques. They can meet this requirement several ways: printed text on the package, a USDA-designed symbol (a green circle with the sun and a field), a QR code or digital link, or a text-message option. Small manufacturers get additional flexibility, including phone numbers or web addresses. The standard applies only when modified genetic material is actually detectable in the final food, so highly refined ingredients like oils and sugars derived from engineered crops may not require disclosure if no modified DNA remains after processing.