Why iodine is added to salt, and what’s missing
Prior to 1920, the northern US had a region known as the “goiter belt” due to iodine deficiency that ran along the Great Lakes, Appalachians and Northwest. Up to 70% of children in this region at that time had a visible goiter. Because of this, in 1924 the US started to implement a non-mandatory salt iodine fortification program which still continues to this day.
Some, but not all countries in the world eventually adopted a similar program. It wasn’t until the year 2000 that the country of Denmark instituted their own iodine fortification program to help lower the risk of thyroid