Most people think of cotton as a fiber. That makes sense: Cotton gives us clothing, towels, bedding, medical products, home furnishings, and thousands of other textile products. But focusing only on the fiber overlooks an important part of the cotton plant.
Cotton also produces food.
For every harvest of cotton fiber, farmers produce a substantial quantity of cottonseed. That seed can be processed into cooking oil, livestock feed, and other valuable products, making cotton a crop that contributes not only to the world’s fiber supply but also to its food system.
And advances in agricultural science could make cottonseed an even more important source of nutrition in the future.
Cottonseed: The Other Half of the Crop
Cottonseed is not simply a minor by-product of fiber production. For every kilogram of cotton fiber produced, the plant generates considerably more than a kilogram of seed.
Cottonseed contains both oil and high-quality protein. ICAC research has estimated cottonseed at approximately 21% oil and 23% protein, making the seed itself an important agricultural resource.
After cotton is harvested and the fiber is separated from the seed at the gin, that seed can enter several different markets.
Some is saved for planting the next crop. Much of the rest is processed into food, feed, and industrial products.
Very little of the cotton plant needs to go to waste.
Cottonseed Oil: Cotton on the Dinner Table
One of cotton’s most familiar food products is cottonseed oil.
After cottonseed is processed and refined, its oil can be used for cooking and food manufacturing. Cottonseed oil has long been used commercially in products such as baked goods, snack foods, salad dressings, and other prepared foods.
The refining process removes gossypol, a naturally occurring compound in cottonseed that protects the plant from insects and diseases but can be toxic to humans and some animals at sufficiently high levels. USDA notes that properly processed cottonseed and cottonseed oil can be used as edible products after gossypol is reduced to safe levels.
That means the same plant that provides fiber for a shirt can also produce oil for the kitchen.
An Important Source of Livestock Feed
Cottonseed is also an important source of animal nutrition.
Whole cottonseed and cottonseed meal contain protein, energy, fiber, and other nutrients that make them valuable livestock feeds.
Cottonseed products are particularly well suited to ruminants such as cattle, sheep, and goats. Their digestive systems allow them to tolerate levels of gossypol that would be unsuitable for humans and many non-ruminant animals.
After oil is extracted from cottonseed, the remaining meal is rich in protein and can be incorporated into livestock rations. USDA research notes that cottonseed meal has traditionally been used primarily as feed for ruminant animals because of the presence of gossypol.
In this way, cotton contributes indirectly to the human food supply as well, helping support the production of milk, meat, and other livestock products.
Why Gossypol Matters
Cottonseed has enormous nutritional potential, but there is one major obstacle to using its protein more widely for human food: gossypol.
Gossypol is a naturally occurring compound produced by the cotton plant. It serves an important purpose by helping defend the plant against insects and diseases.
But gossypol is toxic to humans and many non-ruminant animals at high enough concentrations. That is why ordinary cottonseed cannot simply be ground into flour or eaten as a protein-rich food.
The challenge for scientists has been to reduce gossypol in the seed without eliminating it from the rest of the plant, where it continues to provide valuable natural protection.
That distinction is crucial.
A cotton plant with no gossypol anywhere could become more vulnerable to pests and disease. But a plant that retains gossypol in its leaves, stems, and other tissues while producing seed with extremely low levels could offer the best of both worlds.
Enough Protein for 500 Million People
The potential is enormous.
USDA researchers have estimated that the cottonseed produced worldwide contains enough protein to satisfy the annual protein requirements of approximately 500 million people.
ICAC research has cited the same estimate.
Today, much of that protein cannot be used directly for human nutrition because of gossypol.
But scientists have been developing cotton varieties in which gossypol is dramatically reduced specifically in the seed while remaining present elsewhere in the plant.
Research into these ultra-low-gossypol cottonseed varieties could eventually transform what is already one of the world’s major fiber crops into a much larger source of human protein.
Recent scientific research continues to describe the potential of the global cottonseed crop to provide protein for roughly half a billion people if the gossypol limitation can be overcome.
A Crop That Produces More Than One Essential Product
This potential is especially compelling because the cotton does not have to be grown instead of a food crop.
The seed is already being produced alongside the fiber. Every cotton harvest generates both.
That means improvements in cottonseed utilization could increase the amount of food and protein produced from existing cotton agriculture without requiring a separate crop to be planted solely for that purpose.
For countries already producing cotton, that creates an opportunity to gain more value — and potentially more nutrition — from every harvest.
Supporting a More Efficient Food System
Using more of what agriculture already produces is an important part of building a sustainable global food system.
Cotton demonstrates how one crop can serve multiple purposes.
Its fiber provides a renewable raw material for textiles and countless other products. Its seed provides edible oil and nutritious livestock feed. Cottonseed hulls and other processing products have additional agricultural and industrial uses.
And advances in science may eventually unlock much more of cottonseed’s considerable protein content for direct human consumption.
Instead of thinking of cotton simply as a fiber crop, it makes more sense to think of it as a multipurpose crop.
Food, Feed, and Fiber
One of cotton’s greatest strengths is how much of the plant can be put to productive use.
The fiber clothes us.
The oil helps feed us.
The seed and meal help feed livestock.
And the protein contained in cottonseed could someday become an important additional source of nutrition for hundreds of millions of people.
That versatility matters in a world facing growing demand for food, fiber, and natural resources.
Cotton does much more than clothe millions
of people around the world. It helps feed those people, too.