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How does salt help preserve cured meat?

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meat cutting — meat processing A butcher cutting beef.

In meat processing, salt (sodium chloride) serves as a fundamental preservative by acting as an antimicrobial agent that inhibits the growth of spoilage and pathogenic microorganisms.1

Its primary mechanism involves decreasing the moisture content available within the meat, which is essential for the survival and reproduction of spoilage bacteria. By reducing this available water, salt effectively creates an environment that is hostile to microbial growth, thereby extending the shelf life of cured products like ham and sausage.2

In addition to its role in moisture reduction, salt is often used in combination with other curing ingredients, such as nitrites, to further enhance food safety and improve the color and flavor of the final product.23