I suffer from low blood pressure. In the summer time I have to take salt pills in order to keep from passing out from blood pressure crashes after sweating for a while.

I my case, a lack of salt can lead to death rather easily.

There are those who are prone to high blood pressure, thus taking more salt can lead to their having a deadly blood pressure.

It boils down to the person on how much salt they needs, however we all do need salt and most of us do not enough salt through just food alone, we need to use either sea or mineral salts.

Many other species also need mineral supplementation of salt(s). Cattle are given artificial salt blocks that they lick, however in more wild areas, cattle will see mineral salt deposits to lick/eat to supplement.