Nicolas Appert’s method of food preservation solves a problem as old as hunger

Story: 1809 C.E.  |  Last updated: January 1, 1809

A French confectioner working in a modest kitchen had no idea he was rewriting the relationship between humans and food. In 1809 C.E., Nicolas Appert made a straightforward but world-altering observation: food cooked inside a sealed glass jar did not spoil. The seals, not any particular ingredient or recipe, were the key. That insight — earned through years of patient trial and error — became the foundation of modern food preservation.

What the evidence shows

• Food preservation prize: The French government offered 12,000 francs to anyone who could devise a cheap, effective method of preserving large quantities of food for the military — Appert claimed it in 1810 C.E.
• Glass jar sealing: Appert’s method involved cooking food inside glass jars and sealing them airtight, a process he refined over roughly a decade before submitting his findings.
• Shelf life science: The reason the method worked — killing microbes through heat — would not be understood until Louis Pasteur’s work roughly 50 years later, meaning Appert succeeded entirely through observation and experimentation.

Why the military made it happen

Appert’s breakthrough did not emerge from pure curiosity. It was pulled into existence by war.

Napoleon’s Grande Armée was enormous by the standards of the time, and feeding it was a genuine strategic crisis. Campaigns were largely limited to summer and autumn because armies could not carry enough food to operate year-round. The French government’s cash prize — the equivalent of a small fortune — was a direct attempt to solve that problem through innovation.

Appert won. But the army’s adoption of his method was slow. The canning process was still laborious, each glass container requiring careful hand preparation and hours of cooking. The wars ended before canned food could meaningfully reshape military supply lines. The revolution Appert started would take decades to fully unfold — and it would unfold in kitchens and factories, not on battlefields.

From glass jars to tin cans

Appert’s original method used glass, which was fragile and expensive to transport. The shift to metal changed everything.

Based on Appert’s approach, the tin can process was developed in Britain, with Bryan Donkin and John Hall establishing commercial production in London. By 1817 C.E., Donkin had sold thousands of pounds’ worth of canned meat to the British military. Explorers began carrying canned food to the Arctic. The technology spread to the United States, where the first American canning factory opened in New York City in 1812 C.E.

By the 1860s C.E., machine-made steel cans had replaced slow hand production, and the time required to cook food inside a sealed can had dropped from around six hours to thirty minutes. Canned food, once a luxury item affordable only to the wealthy, moved steadily into the lives of working-class families in rapidly urbanizing cities across Europe and North America.

Lasting impact

It is difficult to overstate how much food preservation changed daily life for ordinary people.

Before canning, eating well depended on geography, season, and proximity to farmland. A family living in a city in winter ate what could survive without refrigeration — which was not much. Canning broke the seasonal lock on nutrition. Vegetables, meats, fish, and fruits could now travel thousands of miles and sit on a shelf for years without spoiling.

The consequences rippled outward in every direction. Global food systems became more complex and interconnected. Armies could campaign year-round. Urban populations could grow faster because food supply was no longer a hard ceiling on city size. Companies like Heinz, Nestlé, and Underwood built entire industries on Appert’s foundational insight.

During World War I, canned food fed millions of soldiers across years of grinding trench warfare. After the war, companies refined their products for civilian sale. The modern supermarket — with its long aisles of shelf-stable goods — is, in a direct and traceable line, a consequence of one man sealing food in glass jars in 1809 C.E.

Appert’s method also contributed indirectly to germ theory. The fact that sealed, heated containers prevented spoilage was a data point that helped later scientists understand what spoilage actually was. Louis Pasteur built on a world of existing evidence when he demonstrated the role of microbes in the 1860s C.E. — evidence that Appert’s decades of practical work had helped accumulate.

Today, canned food reaches disaster zones, remote communities, and World Food Programme operations in some of the most difficult places on Earth. The shelf life that ranges from one to five years under normal conditions — and far longer in controlled environments — makes it uniquely suited to humanitarian response.

Blindspots and limits

The early history of canning includes a significant failure. Some of the first commercial tin cans were sealed with lead solder, which leached into food and almost certainly harmed the people who ate it. The disastrous 1845 Franklin Arctic expedition — in which the entire crew perished — was long associated with lead poisoning from canned provisions, though more recent studies suggest malnutrition may have played a larger role.

The industrial canning boom of the 19th century also concentrated food production in ways that displaced traditional food knowledge — drying, fermenting, pickling, salting — that many communities had developed over centuries. Indigenous and rural peoples across Africa, Asia, and the Americas had sophisticated food preservation traditions long before Appert’s prize, and the dominance of industrial canning gradually marginalized those methods, even where they were nutritionally superior. The story of food preservation did not begin in a French kitchen. It merely changed shape there.

Read more

For more on this story, see: Wikipedia — Canning

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• The Good News for Humankind archive on food security

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