Without adequate amount of salt, we would not be able to survive. It regulates our bodies and also helps activate hydrochloric acid, which with enzymes allow to break down our foods properly. Must watch video.
Also the video covers why Salt is great for hydration along with electrolytes. (potassium).
Remember, not all salt is created equal. Refined salt is dead with additives, vs unrefined salt, which is filled with minerals and many more benefits, to regulate our blood pressure and more.