Most of them are needed, but not in areas with high water iodine (our country has always implemented the practice of supplying non-iodized salt in areas with high water iodine).

Salt iodization is an internationally recognized leading measure to prevent and treat iodine deficiency diseases.

The reason why Chinese people are generally not deficient in iodine is because we have been compulsorily consuming iodized salt for 20 years.

However, ingested iodine can only remain in the human body for 100 days.

In iodine-deficient areas, people will become iodine deficient again if they do not supplement iodine for 100 days.

Most areas in our country are iodine-deficient, so most people need to consume iodized salt for a long time.

Extended information Common misunderstanding - "People at the seaside are not deficient in iodine" In 2009, the health department conducted a survey on the iodine nutritional status of residents in coastal areas. The results showed that the median urinary iodine status of residents in coastal areas of Fujian, Liaoning, and Zhejiang provinces was lower than

Median urinary iodine among rural residents in inland areas.

55.4% of pregnant women in Shanghai are deficient in iodine nutrition.

Iodine level: The World Health Organization recommends a daily iodine intake of 150 to 300 micrograms for adults. Medical research institutions in the European Union and the United States believe that the tolerable upper limits of iodine intake for adults are 600 micrograms and 1,100 micrograms per day respectively.

The average iodine content of iodized salt in my country is 30 mg per kilogram. Based on a daily salt intake of 5 to 10 grams per person, the daily iodine intake is about 150 to 300 micrograms.

After deducting losses from cooking and human metabolism, the iodine intake from consuming iodized salt will not be higher than the amount recommended by the World Health Organization.