Salt has been around since creation and is found is areas all over the world. And it has been used by people for who knows how long.
Evidence has been discovered showing salt extraction and drying going back to 6051 BC in Romania. And in China they have found a verifiable salt works dating to 6000 BC. The use of salt is necessary for healthy human development.
Of course too much of a good thing can cause you health problems as well. That's certainly true for modern mankind. I read somewhere that food companies will use 5 billion pounds of salt a year in their industry. This number seems absolutely astronomical, but it could very well be true.
The very first patent was issued in North America to Samuel Winslow for his new process in making salt. I could not find any information on just what this process was, but it would be interesting to know.
Salt is used as a compliment, as in "He's the salt of the earth." And it can be used as a caution: "Take it with a grain of salt." But it is still a necessity. One quote I liked was from Helen Rowland: "A wise woman puts a grain of sugar into everything she says to man, and takes a grain of salt with everything he says to her."
Nelson Mandela once said: "Let there be work, bread, water and salt for all." That pretty well covers what we all need to have a sustainable life with a chance of success.
I say to you: May your life be flavored with enough salt to make it interesting but not so much you produce salty tears of grief."