Group 1 - The core issue of iodine deficiency remains a public health concern in China, with a significant portion of the population still lacking adequate iodine intake despite improvements over the years [2][4][3] - The recommended daily iodine intake for pregnant women is 230 micrograms, which is double that of adults, highlighting the importance of sufficient iodine during pregnancy to prevent developmental issues in infants [1][2] - The implementation of universal salt iodization has been effective in reducing the prevalence of iodine deficiency disorders, with a reported iodized salt coverage rate of 94.8% and a suitable iodine nutrition status among pregnant women [3][4] Group 2 - Despite the progress made, there is a growing misconception among the public that iodine deficiency is no longer a concern, leading to increased consumption of non-iodized salt [4][6] - Iodine is essential for the synthesis of thyroid hormones, which are crucial for metabolism and overall health; a lack of iodine can lead to various health issues, including thyroid dysfunction [4][6] - Epidemiological studies indicate that iodine deficiency is a risk factor for thyroid nodules, and adequate iodine intake may help reduce the incidence of such conditions [7][6] Group 3 - The majority of salt consumed in China is from well and rock salt (87%), with iodized salt being the recommended option to meet iodine needs while also addressing sodium intake [8] - In coastal regions, despite the availability of iodine-rich foods like seaweed, the consumption frequency is low, making iodized salt a necessary source of iodine for residents [9][8] - The public health strategy of iodizing salt is recognized as a safe, effective, and low-cost method to ensure adequate iodine intake across the population [7][3]