Salting (food)

Salting is a method used to preserve food using dry, edible salt.

This process is a form of curing and is closely related to pickling. It can also involve brining, which means preparing food in a salty liquid called brine. Salting is one of the oldest ways humans have kept food safe to eat. It allows people to store animal proteins and vegetables for long periods. This is especially important when refrigeration is not available. Many cultures rely on salted foods as a primary part of their diet.

The science of salting relies on a process called osmosis. This occurs because salt creates a hypertonic environment. A hypertonic environment is one where the salt concentration is much higher than inside a cell. When microorganisms like bacteria or fungi are in this environment, osmosis draws water out of their living cells. This dehydration causes the cells to die or become temporarily inactivated. To kill most unwanted bacteria, salt concentrations of up to 20% are often required. This mechanism prevents the decay that would normally make food unsafe.

There are several distinct ways to apply salt to food. One method is corning, which involves rubbing large, coarse pellets of salt into meat. This term comes from the Old English word for large grains or "corns." Today, corned beef is a well-known example, though it is often brined rather than dry-salted. Another method is using brine to soak the food entirely. Some people also combine salting with smoking. Smoking adds specific chemicals to the surface of the meat. These chemicals can actually reduce the total amount of salt needed for the process.

Historically, salting has been vital for survival during long journeys. In the 14th century, people had specific steps for preserving venison. They would cover the animal in bracken plants immediately after it was killed. Then, they would butcher the meat, boil it in brine, and apply dry salt in a barrel. During the Age of Sail, salted meat was a staple for mariners. The Royal Navy diet often consisted of salted beef and salted pork stored in barrels. These supplies had to last for many months at sea. Even in 1938, the crew of the ship Moshulu ate mostly salted meat because they lacked refrigeration for 100-day voyages.

Many different types of food are produced through these methods. Salted meats include bacon, ham, jerky, and pastrami. Other examples are biltong, cecina, jamón, and salt pork.

In the 19th century, a new discovery changed how meat looked. Scientists found that mixing salt with nitrates, such as saltpeter, kept meat red instead of grey. This led to the creation of Prague powder, also known as curing salt. This powder contains sodium nitrite and is dyed pink so people do not confuse it with regular salt.

Fish is also frequently salted or dried. This is a staple in the Caribbean, West Africa, Scandinavia, and the Arctic.

Salting also plays a significant role in religious customs. In Jewish and Muslim dietary laws, salt is used to remove blood from freshly slaughtered meat. In the practice of Kosher Shechita, salting is considered almost a requirement. In Halal Dhabiha, draining the blood is often enough, but salt is still used. These traditions show how a preservation technique can become a deeply meaningful part of a culture's identity. It connects the physical act of preparing food to spiritual requirements.

While salting is useful, health experts advise caution regarding its consumption. The American Institute for Cancer Research notes evidence that salted foods may increase the risk of stomach cancer. This risk is linked to salt-preserved fish and meat. Additionally, high salt intake has a dose-response relationship with elevated blood pressure. This can increase the risk of various cardiovascular diseases. Modern food science now uses other methods alongside salting, such as freeze-drying and automated humidity control, to manage food safety more precisely.