I wont get into it to much here. I will be making a post on it soon, but salt is a dead substance. It is inorganic no matter the form. Since it is dead and inorganic our body cannot use the nutrients in it. The salt belongs in the ground so the plants can grow from them and we eat the plants which have the living salts in them in a bio available form.
Think if you ate a bunch of salt what would happen? You would die because it dries the body out and provides no nutrition. Animals will not even touch salt water if you give it to them they can sense it is not healthy. If you research into ancient cultures even the Native Americans here in the US they did not use salt and would not eat the European's food that had salt on it. The only reason salt was even used in the first place was to preserve food not make it healthy.
It has it's place as everything does, but being used for nutrition is not that.