Iodine's functions are all accomplished through thyroxine, and iodine has not yet been found to have an independent physiological function. Therefore, the physiological function of iodine described below is actually the physiological function of thyroxine.

1, promote energy metabolism: promote the decomposition of material metabolism, produce energy, maintain basic life activities.

2, maintain the physiological function of the pituitary gland.

3, to promote development: developmental children's height, weight, bones, muscle growth and development and sexual development are dependent on thyroxine, if the lack of iodine at this stage, it will lead to children's stunted growth.

4, promote brain development: in the primary stage of brain development (from the beginning of pregnancy to 2 years old after the birth of the baby), the development of the human nervous system must rely on thyroxine, if the lack of iodine in the diet during this period, will lead to backwardness in the development of the baby's brain, the serious clinically referred to as "cretinism", and the process is irreversible, and later on, the lack of iodine will lead to children's poor development. The process is irreversible, and even if you supplement with iodine in the future, it's impossible to return to normal.

The harm of iodine overdose:

The harm of iodine overdose on human health mainly includes the following aspects:

1, high iodine on the function of the thyroid gland, the most common is iodine-induced goiter (IH) and high iodine hyperthyroidism.

2, the effect of high iodine on the intelligence of the relationship between iodine excess and intelligence only in recent years has attracted the attention of experts and scholars. A number of epidemiological surveys carried out in the population show that the IQ of students in high iodine areas is significantly lower than that of iodized areas. Most of the animal experimental studies have also proved that excessive iodine load can indeed make the animal brain weight reduction, learning and memory loss, although this effect is not as obvious as the role of iodine deficiency.

3, high iodine on the impact of sexual function of the United States, a study has shown that iodized salt intake and male sperm count has a certain relationship, suggesting that the consumption of iodized salt in the United States may lead to a reduction in the sperm count of men. In addition, there have been many reports of the effects of iodine overdose on the fertility of rats, which can not be said to be excessive iodine supplementation brings us another kind of worry.

Three, the harm of iodine deficiency:

The harm of iodine deficiency is due to the lack of iodine in the natural environment caused by the body of iodine nutritional deficiencies in the manifestation of the related diseases or hazards of the general term. It includes maternal miscarriage, preterm labor, stillbirth and fetal congenital malformations, endemic goiter, cretinism and subcretinism, simple deafness, intellectual development and growth development damage. Iodine deficiency in adults will affect thyroid hormone synthesis, leading to bodily dysfunction.