Salt iodization is an internationally recognized main measure to prevent and treat iodine deficiency. The reason why people in China are generally not short of iodine now is that we have been forced to eat iodized salt for 20 years. However, iodine intake can only stay in the human body 100 days. In iodine-deficient areas, if iodine is not supplemented for 0/00 days, people will be short of iodine again. However, most areas in China are iodine-deficient areas, and most people need to eat iodized salt for a long time.
The Common Misunderstanding of Expanding Data —— "People at the seaside are not short of iodine"
In 2009, the Ministry of Health conducted a survey on iodine nutrition status of residents in coastal areas. The results show that the median urinary iodine of residents in Fujian, Liaoning and Zhejiang coastal areas is lower than that of rural residents in inland areas. 55.4% pregnant women in Shanghai suffer from iodine malnutrition.
Iodization level
The World Health Organization recommends that the daily iodine intake of adults is 150 to 300 micrograms, and medical research institutions in the European Union and the United States believe that the tolerable upper limit of iodine intake of adults is 600 micrograms and 1 100 micrograms respectively.
The average iodine content of iodized salt in China is 30mg/kg, and the daily iodine intake is about 150-300 micrograms based on the daily salt intake of 5- 10g per person. After deducting the loss of cooking and human metabolism, the iodine intake brought by eating iodized salt will not be higher than the recommended amount of the World Health Organization.
References:
People's Daily Online "Is it necessary to eat iodized salt?"