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Salt is perhaps most well known as a food preservative and flavoring agent. It has been used to preserve food for many thousands of years and is the most common seasoning. But salt also plays other, lesser-known roles in the food we eat as an essential nutrient, providing flavor and texture, and enhancing color. For these reasons, salt is used in food production, which is why the sodium content of processed foods is so high.
A Food Preservative
Salt-curing meat (and other foods) is one of the oldest methods of food preservation, occurring well before refrigeration. Microbes that can spoil food need moisture to grow, and salt acts as a preservative by drawing moisture out of food. Many disease-causing microbes are also simply unable to grow in the presence of salt.
When salt is mixed with water, it becomes a brine. Brining is soaking food in heavily salted water, which preserves and flavors food. Pickling, for example, is a form of brine.
A Texture Enhancer
Most people do not realize that salt plays a large role in creating texture in food. When making yeast bread, for example, the amount of salt greatly affects the rate of yeast fermentation and gluten formation, both of which will significantly affect the bread’s final texture.
Salt also has a profound effect on the gelatinization of proteins, which occurs in cheese production and many processed types of meat such as sausage, bologna, and ham. In processed meat products, salt helps retain moisture, and so less saturated fat is needed.
When a steak is salted at the right time, it will encourage the meat to release more liquid, which eventually reabsorbs into the meat resulting in a juicy (and flavorful) steak. Large salt crystals are also often used as a garnish to add a crunchy texture, as with soft and hard pretzels.
A Flavor Enhancer
Salt acts in multiple ways to enhance the flavor of food. Not only does it create a “salty” flavor element, one of the most desired tastes by humans, but salt can also affect other flavors, such as sweet and bitter.
In small amounts, salt will intensify sweetness, so it is sometimes sprinkled on fresh fruit or added to candies like caramel. Salt can also counteract bitter flavors in food—it is often used to “de-bitter” cruciferous vegetables (like broccoli) and olives.
Salt will also help release certain molecules in food, bringing out some of the ingredients’ flavors and making food more aromatic.
A Nutrient Source
Pure table salt is comprised of approximately 40 percent sodium and 60 percent chlorine. Although most Americans consume far too much sodium, it is a nutrient that is essential for survival. Sodium is needed to help relax and contract muscles, conduct nerve impulses, and sustain the proper balance of minerals and water in the body. Most table salts in the United States also have iodine added to them to prevent iodine deficiencies, which can cause disorders of the thyroid, including goiters.
Because salt helps form protein gels, it can be used as a binding agent. When salt is added to foods such as sausage or other processed meats, it causes gelatinization of proteins which then hold the product together.
A Color Enhancer
The vibrant color of many processed types of meat, such as ham or hot dogs, is partially due to salt. The presence of salt helps promote and maintain color and prevents it from turning gray or muddy. Salt also increases caramelization in a bread crust, which helps it get that golden color.
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How Salt Defined World History
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When we talk about things being traded across empires and bringing merchants to faraway lands, we usually think of resources like gold or silver or diamonds, but what about salt?
“A Powerful Family” by Taomito*
“Suvaco do Cristo” by Kevin Macleod
“Caravan Trails” by Sight of Wonder*
“The Search for Self” by Jon Björk*
“The Wild West” by Ross Bugden
“Sea Adventures” by Bonnie Grace*
Artwork at 4:00 by lukefaxon
Salt, by Mark Kurlansky (2002)
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