(Latin for grain of salt) The idea for grain of salt as a remedy first appeared in Pliny’s Naturalis Historia, 77 A.D. and it translates this way: After the defeat of that mighty monarch, Mithridates, Gnaeus Pompeius found in his private cabinet a recipe for an antidote in his own handwriting; it was to the following effect: Take two dried walnuts, two figs, and twenty leaves of rue; pound them all together, with the addition of a grain of salt; if a person takes this mixture fasting, he will be proof against all poisons for that day. It was much later that the term took on a warning of sorts for things said/heard.  You can read about it here . 

More Herbs Less Salt Day 5 Herbs to Replace Salt Reducing or eliminating salt doesn't mean bland food, substitute in spices and herbs. Here's how: Individual Rights Day What are Individual Rights? Human rights are rights inherent to all human beings List of Human Rights Issues Human Rights Watch theadvocatesforhumanrights.org