Today's doctors urge less salt, but such an advice would have sounded at least odd to the people of yore who had to do with preindustrial food. Ever since the dawn of civilisation salt was a rare and valued product. Its extraction was difficult, trading it often entailed travel of hundreds of miles, the control of salt extraction sites generated wars. Long before gold and silver became measures of wealth salt was used as a universal currency.
A prehistoric site in northeastern Bulgaria now reveals the role salt played in founding the first urban centre in Europe.