Seafood should not be eaten more, because seafood salt is more, and iodine content is relatively high, eaten more easily lead to iodine overdose of harm, including acute iodine overdose and chronic iodine overdose caused by the harm, iodine is the raw material for the synthesis of thyroid hormones, but also regulates the synthesis and release of thyroid hormones. Due to the self-regulation of the thyroid gland, excessive iodine intake for a certain period of time will not cause significant thyroid dysfunction, but chronic iodine overdose can lead to an imbalance in the regulation of the thyroid gland and dysfunction, which can lead to thyroid disorders.

Excessive iodine intake can disrupt the normal functioning of the thyroid gland, leading to goiter, hypothyroidism, and can also induce or promote the occurrence and development of autoimmune thyroiditis. Excessive iodine intake also has adverse effects on women during pregnancy and pregnancy outcomes. Thyroid-stimulating hormone levels are significantly higher in pregnant women in areas with excessive iodine intake than in those in areas with appropriate iodine intake, and excessive iodine intake increases the risk of subclinical hypothyroidism in late pregnancy. It may also impair fetal thyroid function and cause neonatal hypothyroidism.