here's a quote from a website about the benefits of "good" salts i.e. rock salt
http://www.industryinet.com/~ruby/salt_truth.html
Salt, has been vilified and denigrated, despite the fact that it is essential to life. The Bible calls Jesus followers the salt of the Earth. Not a criticism, but a compliment. Salt licks are essential for cattle to maintain health and they die without it. Cattle will walk for miles to get to a salt lick.
Now when I speak of salt, I am referring to natural sea (or rock) salt, not table salt, which is merely sodium chloride (NaCl). It is table salt that is responsible for raising blood pressure and causing heart problems. Sea salt (Celtic) is the best form and contains many minerals, like magnesium, calcium, potassium, sodium, chloride, sulfate, phosphate and many other trace minerals. Sea salt does not raise blood pressure and is very health promoting.
The importance of trace minerals and electrolytes on our health cannot be stressed enough. Gillian Martlew, ND states, "Trace minerals and electrolytes are the spark of life, and without them we simply wouldn't function."
The terms electrolytes, ions, minerals, may be used as other terms for salt. She adds, "Electrolytes are ionized salts (minerals) found in body fluids and the blood stream. In solution, or dissolved and transformed in water, they can conduct an electric current."
"The whole body is a bioelectric organism and the nervous system and brain also operate on electrical energy. Electrolytes are both the switch and the energy source."
Dr Bernard Jensen stated, "All cellular structures become alive through electrolytic activity. Life begins with electrolytes. Trace minerals carry the life force in our bodies more than any other substance."
Salt adds minerals (ions) to our foods and enhances its flavor. Without salt, our body cannot make adequate amounts of HCl (stomach acid). With low levels of HCl, our digestion is impaired and we cannot absorb minerals. Minerals are needed for activating enzymes, and other important metabolic functions. Therefore, one can see the idiocy of taking antacids (or avoiding salt) which block mineral absorption. Low levels of HCl can be translated into disease quite easily, for without minerals one cannot be healthy. Salt is also needed to maintain osmotic balance (water), to control pH levels and to help activate enzymes. Salt serves as a natural buffer for acidity and through osmotic mechanisms, salt helps to control the amount of water within the cells (intra cellular fluid) and around the cells (extra cellular fluid).
Gillian Martlew, ND stated, "Electrolytes are essential to the production of enzymes, the function of cells, and in maintaining a normal pH balance in the body and digestive system. Electrolytes also maintain normal fluid balance including osmosis (the cells internal and external fluid pressure), and blood pressure."
Jaques de Langre, PhD, in his praise of sea salt, states, "... the oceans give us a natural sea salt with the most exquisite taste and a physiologically-vital mineral mix. Today, every common table salt is artificial and sadly pales beside the real sea salt. Out of the richest spectrum of 92 essential minerals found in the ocean, the industrial refined variety retains only two! Debased white table salt deserves all of its bad name and all the misdeeds as charged.
Therefore, do not confuse common refined table salt (sodium chloride) with natural unrefined (and health-promoting) sea salt. He continues, "Salt is the single element required for the proper breakdown of plant carbohydrates into usable and assimilable human food.