Your body needs salt to function. If you’re dehydrated, sick or injured, the first thing they give you in the hospital is a saline solution IV. 

Refined table salt is not very good for you. Most of it comes from mines, and is so heavily processed that many minerals are depleted. 

If you’re cooking, try using sea salt if your recipe calls for it. This is a healthier alternative. Sea salt has greater nutrient value.