How does soy sauce preserve food?

Soy sauce preserves food primarily through its high salt content, which inhibits the growth of spoilage-causing bacteria and molds. The fermentation process involved in making soy sauce also produces natural preservatives, such as acids and alcohol, that further contribute to its antimicrobial properties. Additionally, the low pH of soy sauce creates an environment that is less favorable for many pathogens, enhancing its preservative effect.