How Salt Works explores the surprisingly complex story of salt, a substance vital to both cooking and civilization. It delves into the chemistry of sodium chloride, explaining how its unique properties enable food preservation through pickling and curing, extending shelf life by preventing spoilage. The book also highlights salt's historical significance, revealing its role in shaping economies, trade routes, and even military conflicts.

The book approaches the topic by examining the science, applications, and history of salt. It progresses from the chemical properties of salt to its culinary uses, health implications, and historical impact, concluding with practical guidelines for usage and dietary recommendations.

Understanding salt, therefore, becomes more than just knowing a seasoning; it's understanding a fundamental aspect of human life.