Iodine is necessary for the thyroid gland to make thyroxine hormone. In case iodine is deficient in our diet, there is a possibility that we might suffer from goitre.
So this is made to compensate the lack of iodine, normally affecting people that live far from the sea and not eating enough fish and other seafood that contains natural iodine.
Iodine deficiency can also produce mental retardation and is a global problem. Excessive use of table salt (NaCl) is also harmful, so a balanced seafood diet is better against mental and other malnutrition problems
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Iodised salt
NO !!
iodine is necessary for the thyroid gland to make thyroxin hormone. thyroxin regulates carbohydrates, protein and fat metabolism in the body so as to provide the best balance for growth. iodine is essential for the synthesis of thyroxin so the use of iodised salt is advisable.
Iodised salt is recommended to avoid idiocy.See this link: http://en.wikipedia.org/wiki/Iodised_salt.
The healthier salt is iodised; but the sea salt can be also iodised.
Iodised salt (sodium chloride) contain iodine (as potassium/sodium iodide or potassium/sodium iodate). The concentration of iodine is 20 +/- 5 mg/kg. Iodised salt is recommended to avoid idiocy.
KFC use fine iodised sodium chloride.
Iodised table salt contain sodium chloride, potassium iodide (or iodate) and anticaking substances.
Thankfully it is now very easy to get non-iodised salt at local grocery chains. Brands like Kroger, Harveys, and Publix all have store brand non-iodised salt. Lawreys and Morton also sell a non-iodised salt on their website.
waitrose or ocado
There are commonly two types of 'regular' table salt. One is 'Iodised' the other is not. Do not use the 'Iodised' salt in fish tanks. I would advise you to use cooking salt as that is not 'Iodised'.
See the following link: http://www.sspindia.com/salt-processing-plant.html#iodised-salt-processing-plant.