In September 2015, a federal court in Georgia sentenced a 61-year-old American businessman to 28 years in prison. His crime was not murder, drug trafficking, or terrorism, but the distribution of contaminated peanut butter. It remains the harshest sentence ever handed down in a U. S.
food safety case. Stewart Parnell ran the Peanut Corporation of America, which supplied peanut butter in bulk to manufacturers of cookies, ice cream, snack bars, and dog food. At his plant in Blakely, Georgia, rainwater leaked directly onto the production line, and rodent droppings were found throughout the facility. When laboratory tests detected salmonella, the company sometimes ordered another test, and if the second one came back clean, the shipment was sent to customers anyway.
When a manager emailed Parnell that another batch had failed inspection, he replied with three words: “Ship it anyway. ”
So he did. Nine people died, 714 fell ill across 46 states, and nearly 3,900 products from 361 companies were pulled from shelves. At the time, it was the largest food recall in American history.
It also raised a troubling question: how did a product so strongly associated with childhood safety become so dangerous? To understand that, it helps to look at the peanut itself, a plant with a remarkable history. The peanut is not actually a nut. It is a legume, related to peas and beans, and it grows in an unusual way.
The plant flowers above ground, and after pollination, a shoot called a gynophore grows downward, pushing into the soil and burying the developing pod several centimeters deep. Only underground does the pod containing the seeds form. The first people to domesticate peanuts lived in what is now Bolivia and northern Argentina around 3,500 years before Christ. From there, the crop spread across the continent.
Archaeologists have found peanut pods placed in pre-Inca tombs along the coast of Peru, intended as food for the afterlife, alongside gold ornaments shaped like peanuts. The Aztecs called it tlalcacahuatl, roughly meaning “earth cacao. ” Spanish chroniclers of the 16th century described how the Aztecs roasted, ground, and sold peanut paste in the markets of Tenochtitlan. Peanut butter, in some form, existed more than 300 years before its first patent.
The plant’s unusual biology made it valuable in poor soils. Its roots carry nitrogen-fixing bacteria that draw nitrogen from the air, so it thrives where cotton and other crops struggle. It needs little more than sandy soil, sunshine, and moderate rainfall. That simplicity made it a crop of the poor, cultivated by people who owned almost nothing else of value.
The Portuguese carried peanuts from Brazil to West Africa in the 16th century. The crop adapted quickly, proving hardy, calorie-dense, and resistant to drought. It reached North America aboard slave ships, carried as inexpensive food for the people packed into the holds. The American southern term “goober” for peanut comes from nguba, a word found in several Bantu languages.
The word crossed the Atlantic together with the people who crossed it in chains. In America, peanuts were long regarded as food for enslaved people, poor farmers, and pigs. No respectable plantation owner would have considered eating them. During the Civil War, soldiers on both sides survived on peanuts when food ran short.
Afterward, they became a popular street snack in northern cities, sold from carts outside circuses and traveling shows. That association with circuses and cheap entertainment gave rise to the expression “peanut gallery,” which survives in English as a term for unwanted opinions from people whose views carry little weight. By the 1870s, peanuts were grown almost exclusively on small farms in southern Virginia and North Carolina, harvested by hand and left to dry on stakes. Mechanical harvesting did not yet exist, keeping production costs high while quality varied.
Large investors saw no real market for the crop. That changed because of an insect. In 1892, the boll weevil crossed from Mexico into Texas. The small beetle laid its eggs inside cotton bolls and spread eastward at up to 100 kilometers a year.
By the 1920s, it had devastated cotton harvests across the American South. An economy built around a single crop began to collapse, and entire farming communities were ruined. Then farmers realized something remarkable: the boll weevil had no interest in peanuts. George Washington Carver, a scientist at the Tuskegee Institute who had been born into slavery, traveled from farm to farm explaining that cotton strips nitrogen from the soil while peanuts put it back.
Rotating cotton with peanuts restored exhausted fields and produced reliable harvests where cotton could no longer survive. The problem was that nobody knew what to do with all those peanuts. The scale of the transformation is captured by a monument. In 1919, the town of Enterprise, Alabama, erected a statue in its main square honoring the boll weevil.
The very insect that had devastated the region was thanked because, after cotton collapsed, local farmers switched to peanuts and earned more money than ever before. The monument still stands. Carver turned his attention to creating demand. In 1916, he published a bulletin titled “How to Grow the Peanut and 105 Ways of Preparing It.
” He promoted peanut milk, flour, coffee, paints, cosmetics, and adhesives, and traveled the countryside with a mobile classroom wagon. In January 1921, he was invited to testify before Congress on tariffs for imported peanuts. A Black scientist in that era was given just 10 minutes to speak. He spoke for nearly 40, pulling sample after sample from his suitcase and holding the attention of the House Ways and Means Committee.
The tariff was approved. Carver is often credited with inventing peanut butter, but he never did. Doing so actually diminishes his legacy, because what he really accomplished was more significant: he helped restore the exhausted soil of an entire region and gave thousands of ruined farmers a crop around which they could rebuild their lives. The patent history of peanut butter is a chain of people solving unrelated problems.
In 1884, Montreal pharmacist Marcellus Gilmore Edson patented a process for grinding roasted peanuts between heated rollers until they reached what he described as the consistency of butter or lard. His intended customers were people who could no longer chew solid food. In 1895, Dr. John Harvey Kellogg, whose name now appears on cereal boxes, patented his own manufacturing process.
A vegetarian and Seventh-day Adventist who ran a sanitarium, he wanted a meat-free protein source for patients with poor teeth. His peanuts were steamed rather than roasted, producing a flavor described at the time as bland. In 1903, St. Louis physician Ambrose Straub patented a peanut butter-making machine, reportedly developed for patients with no teeth.
In 1904, at the St. Louis World’s Fair, a vendor named Sumner reportedly earned about $700 selling peanut butter to tens of thousands of visitors from across the country. All of these men were essentially making medicine. Peanut butter was born in sanitariums and doctors’ offices as food for the sick and elderly.
One technical problem remained: natural peanut butter separates, with oil rising to the top and solids sinking and hardening. A jar on a store shelf for weeks would end up with oil floating above a gray solid mass. In 1922, California chemist Joseph Rosefield applied partial hydrogenation to peanut butter, converting some liquid oils into fats that remain solid at room temperature. The result was a smooth spread that stayed uniform, spread easily, and lasted up to a year.
Rosefield licensed the technology to the Peter Pan brand in 1928 and later launched his own brand, Skippy. He also introduced the wide-mouth jar and, after complaints that the texture was too smooth, a chunky version. Ironically, that same technology came back to haunt the industry 70 years later. Partial hydrogenation produces trans fats, which were linked to cardiovascular disease in the 1990s, forcing manufacturers to switch to different stabilizers.
Today, most major brands use fully hydrogenated oils that do not contain trans fats. The first published recipe for a peanut butter and jelly sandwich appeared in 1901 in the Boston Cooking School Magazine. It attracted little attention for 27 years, until Otto Rohwedder introduced the first practical bread-slicing machine in 1928. Pre-sliced bread made it possible for a child to prepare a sandwich without a knife or adult help.
Then came the Great Depression, when peanut butter provided large amounts of calories and protein for very little money and became a staple of children’s diets. The Second World War completed the transformation. Both peanut butter and jam were included in U. S.
military rations, and soldiers combined them. When millions of servicemen returned home, they brought the habit with them and passed it on to their children. According to a widely repeated American estimate, the average child eats around 1,500 peanut butter and jelly sandwiches before finishing school. The number is probably exaggerated by marketers, but it captures the scale surprisingly well.
By the end of the 20th century, peanut butter could be found in nine out of ten American kitchens, and the country consumed roughly 700 million pounds of it every year. In 1958, Procter & Gamble introduced the Jif brand, which eventually overtook Skippy and Peter Pan to become the market leader. Jif’s plant in Lexington, Kentucky, is still considered the largest peanut butter manufacturing facility in the world. Total success came with a price.
In 2000, the American Academy of Pediatrics advised that children considered at high risk, those with eczema, asthma, or a family history of allergies, avoid peanuts until age three. The logic seemed reasonable: if a child is not exposed to an allergen, they will not develop an allergy. Parents, schools, and manufacturers adopted the advice almost immediately. Then the opposite happened.
According to U. S. data, the prevalence of peanut allergy among children increased roughly threefold between 1997 and 2008. Today, around 2 percent of American children have a peanut allergy.
Reactions can be severe: swelling of the airway, a sudden drop in blood pressure, and anaphylactic shock within minutes. Schools introduced complete peanut bans, airlines stopped serving peanuts, and food packaging began warning that products might contain traces of peanuts. The first sign that something was wrong with the recommendation came from statistics. Doctors noticed that peanut allergy was several times less common among children in Israel than among Jewish children in Britain, despite similar genetic backgrounds.
The difference was in the diet: Israeli infants were routinely given a peanut-based snack called Bamba from an early age, while British parents were being advised to avoid peanuts altogether. The answer came with the LEAP study, published in 2015. Researchers enrolled about 640 high-risk infants and divided them into two groups. One group was given peanut-containing foods regularly between ages 4 and 11 months; the other avoided peanuts entirely.
By age five, peanut allergy was about 81 percent less common among the children who had eaten peanuts early. The recommendation was completely reversed. Today, the advice is the opposite of what it was 15 years ago: introduce peanuts early rather than delaying them. There were no villains here.
Doctors gave the best advice they could based on the evidence available at the time. The advice turned out to be wrong, and an entire generation of children paid the price. That brings the story back to where it began. The Peanut Corporation of America did not sell peanut butter directly to consumers.
It shipped it by the truckload to companies making crackers, ice cream, protein bars, candy, and even dog food. That is how a single factory in a town of just 5,000 people managed to contaminate products across the entire country. The salmonella outbreak was traced back in the fall of 2008, and investigators uncovered internal company emails showing Parnell knew about the positive test results and continued shipping the products anyway. In one message, he complained that delays caused by testing were costing the company money.
Nursing homes and schools were hit especially hard because peanut butter crackers were distributed there regularly. In 2015, Stewart Parnell was sentenced to 28 years in prison. His brother received 20 years, and the company’s quality control manager received 5 years. Every appeal was ultimately rejected.
That sentence still looks like an exception rather than the rule. Food safety cases in the United States almost always end in fines and civil settlements. Parnell went to prison because investigators found emails in which he explicitly ordered contaminated products to be shipped. Had those instructions been given over the phone instead of in writing, the outcome might have been very different.
There is a final twist. In 1996, French pediatrician Andre Briend was searching for a way to treat severe acute malnutrition among children in famine-stricken regions. The standard milk-based therapeutic foods required clean water, refrigeration, and hospital care. In the Sahel, none of those were reliably available.
Briend looked at a jar of peanut butter and realized it solved all three problems: it contains very little water, so bacteria cannot easily grow in it; it does not require refrigeration; and a child can eat it straight from the packet without a spoon, clean water, or a doctor nearby. That insight led to the creation of Plumpy’nut, a peanut-based paste made from peanut butter, dried milk, sugar, vegetable oil, vitamins, and minerals. A single 92-gram sachet provides about 500 calories, and a full course of treatment lasts 6 to 8 weeks, allowing children to recover at home rather than in a hospital. The breakthrough came during the 2005 famine in Niger, when Doctors Without Borders deployed the product on a large scale.
Today, it is the standard treatment for severe acute malnutrition throughout the United Nations system, with recovery rates that exceed 90 percent according to humanitarian organizations. The story is not entirely happy. The formula was patented by the French company Nutriset, and in 2009, American manufacturers challenged the patent, arguing that the monopoly kept prices artificially high and hindered local production. The court ruled in Nutriset’s favor, but the company granted licenses to manufacturers in Niger, Ethiopia, India, and more than a dozen other countries.
Today, a significant share of the product is manufactured in the very places where it is used to treat children. The same product that leads American schools to ban peanuts and post warning signs helps save the lives of millions of children every year across Africa and South Asia. A legume that hides its harvest underground. A food carried across the Atlantic in the holds of slave ships.
A product once dismissed as pig feed and a cheap circus snack. A food for toothless patients in a sanitarium. A product that only became mainstream because a chemist figured out how to stop the oil from separating. It survived the invasion of the insect that devastated the cotton-growing South.
It became part of U. S. military rations and came home as a children’s sandwich. It forced pediatricians to publicly admit that their most important recommendation of the previous 15 years had been wrong.
It sent a man to prison for 28 years. And today, it sits in foil packets in humanitarian warehouses as one of the most effective treatments humanity has for preventing children from dying of starvation. Not bad for something once considered pig feed.