A major dietary source of iodine worldwide is
Inthe Ministry of Public Health estimated that iodine deficiency was responsible for 10 million cases of mental retardation in China. Iodised salt is optional though for animal consumption and the food industry, although widely used. Journal of the European Economic Association. Worldwide, iodine deficiency affects about two billion people and is the leading preventable cause of intellectual and developmental disabilities. Iodised salt also spelled iodized salt is table salt mixed with a minute amount of various salts of the element iodine.