Food preservation
Methods to slow spoilage and reduce food waste.
Food preservation encompasses processes that make food more resistant to microorganism growth and slow the oxidation of fats, thereby slowing decomposition and rancidification. It also includes methods that inhibit visual deterioration, such as enzymatic browning. By reducing food waste, preservation helps decrease production costs, increase efficiency of food systems, improve food security and nutrition, and contribute to environmental sustainability. Many preservation processes involve more than one method, and different techniques have varying impacts on food quality and systems, with some traditional methods showing lower energy input and carbon footprint compared to modern methods, while some methods are known to create carcinogens.
- field
- Food preservation
- known_for
- Techniques including boiling, burial, canning, confit, cooling, curing, drying, and fermentation
Lore & Background
Food preservation techniques have a long history, with some pre-dating the dawn of agriculture. Boiling liquids can kill microbes, and milk and water are often boiled for this purpose. Burial preserves food due to lack of light, lack of oxygen, cool temperatures, pH level, or desiccants in the soil; it may be combined with salting or fermentation. Many root vegetables require only storage in cool dark conditions, such as burial in the ground. Cabbage was traditionally buried during autumn on northern US farms, and similar processes are used for kimchi. In Odisha, India, rice is buried underground for three to six months during the dry season. Butter has been preserved as bog butter in Irish peat bogs for centuries, and century eggs are created by placing eggs in alkaline mud, resulting in fermentation through raised pH.
Reader's Guide
Canning, invented by French confectioner Nicolas Appert, involves cooking food, sealing it in sterilized cans or jars, and boiling containers to kill or weaken bacteria. Confit preserves meat by salting, cooking in fat, and storing immersed in fat. Cooling slows microorganism growth and enzyme action; before mechanical refrigeration, root cellars and iceboxes were used. Curing draws moisture out via osmosis using salt, and smoking adds antimicrobial pyrolysis products. In 2015, the International Agency for Research on Cancer classified processed meat as carcinogenic to humans. Fermentation uses specific microorganisms to produce acid or alcohol, creating an environment toxic to pathogens and making foods more nutritious and palatable.
Did You Know?
- Some food preservation techniques pre-date the dawn of agriculture.
- Canned food can swell or burst if decomposition occurs due to gas production.
- Cooked mushrooms, when poorly handled and canned, can support Staphylococcus aureus, which produces a toxin not destroyed by canning or reheating.
- The International Agency for Research on Cancer classified processed meat as carcinogenic to humans in 2015.
Frequently Asked Questions
What is Food preservation?
Food preservation is the practice of applying techniques that make food more resistant to microbial growth and slow the oxidation of fats, keeping it safe and palatable for longer. It also targets visual deterioration, such as the enzymatic browning that makes cut produce look unappealing.
What are Food preservation's signature techniques?
Fans most commonly associate Food preservation with a toolkit that includes boiling, burial, canning, confit, cooling, curing, drying, and fermentation. These span a wide range of approaches, from simple heat application to biological processes like fermentation.
Why is Food preservation important in the Food And Drink canon?
By cutting down on food waste, Food preservation helps lower production costs and makes food systems run more efficiently. It also plays a key role in improving food security, expanding nutrition access, and supporting environmental sustainability.
How does Food preservation actually work?
At its core, Food preservation targets the two main drivers of spoilage: microbial proliferation and the oxidation of fats that leads to rancidity. It can simultaneously inhibit visual changes, such as enzymatic browning, so food still looks appealing after extended storage.
Does Food preservation rely on a single method?
No—many preservation processes layer multiple techniques together to achieve better results. Different combinations have varying impacts on food quality and on the broader food system, so the right blend depends on the specific food and context.
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