Table salt is the main source of Na+ and Cl- ions. Na+ ions are indispensable in a number of physiological processes, from the water balance and maintenance of constant blood pressure, to the functioning of the nervous system. Consequently, eating table salt is essential for living.
The daily intake for sodium chloride is about 5 g. In order to prevent thyroid diseases obligatory iodination has been introduced in Poland to reduce the risk of iodine deficiency. Meals should not be salted before cooking or otherwise the iodine content will evaporate. In a nutshell - “no iodine, no way”.