The book explores the evolution of salt production, from ancient methods like solar evaporation to rock salt mining, illustrating how control over this vital resource shaped empires. It follows salt's journey along ancient trade routes, the ""salt roads"", revealing how salt caravans facilitated the exchange of goods and ideas across continents.
Progressing chronologically, Salt Impact delves into salt's impact on early civilizations, trade routes, empires, socio-cultural norms, and its role in religious rituals and social customs.