Salt is very necessary for many functions in the body but some people are so concerned with high blood pressure from too much salt that they have taken up avoiding it all together and are sodium deficient.
The cause of high blood pressure is not actually caused by too much salt, but rather too little potassium and too little water consumption. Salt is a good cleanser, it moderates the blood pressure when enough potassium is present, it prevents stiff and sore muscles, is needed for proper nerve function, works with potassium to keep the fluids moving in and out of cells and aids the transport of proteins. It is a very important electrolyte and one of the first to be lost due to excess sweating.
Processed foods do lead to an over abundance of sodium in the American diet, but this is only a problem when there is not enough water intake or potassium for the body to regulate it properly.