"Precocious" necessarily and estrogen related?

Cause the precocious necessarily estrogen? child sexual precocity has been quite interesting. However, analysis of infant precocious present because it is not easy. Not to mention the stage mother-infant may because estrogen effects, a "pseudo precocious" phenomenon, even if the true because the food causes a precocious, also requires careful analysis of female hormones is the "culprit", they are exactly where it came from. Female hormones can cause baby precocious puberty. But can cause baby precocious but is not limited to the female hormone, there are some things that have estrogen effects, in a certain concentration range, you can simulate physiological effects of estrogen, are collectively referred to as the "class of estrogen." Neither the estrogens estrogens, or class, unlike melamine, can optimize product testing data; not like DHA, additives, you can have products to sell a good price. More importantly, they don't look like HGH, can stimulate the baby's growth, but will cause the epiphyseal line closed prematurely, affect a child's height. In this sense, it is hard to imagine that producers in infant milk powder to add these things in the initiative. However, if detected in milk powder contain estrogenic substances, I wouldn't be surprised, because they may be contaminated in the production process. In fact, almost all of baby milk contain trace amounts of dioxin are extremely, PCBs and organochlorine pesticide residues and other environmental pollutants. While most of these environmental pollutants are "estrogen." Dioxin and PCBs were produced in industrial production of pollutants, and organochlorine pesticides in the 1950s to the 1980s widely. These pollutants are persistent organic pollutants, it is difficult to degradation, half-life, and easily in the organism of the adipose tissue of enrichment. In high concentration, these pollutants have carcinogenic potential, all countries are in strong governance dioxin and PCBs, the majority of organochlorine pesticides have been disabled. However, the environment has accumulated a great deal of difficulty degradation of persistent organic pollutants through the food chain, they will enter our body, our body fat accumulation in the tissues. If they accumulate in the human body to a certain concentration, it is possible to simulate human hormone action, interfering with normal endocrine function, resulting in a variety of endocrine disease and abnormalities, such as child sexual precocity. Babies and children are in the developmental stages, on environmental pollutants are also more sensitive. So in recent years child sexual precocity of cases continues to increase, and environmental pollution. States of scientists through experimental toxicology, study a variety of environmental pollutants on health hazards, and find the lowest dose of no compromise. Government departments on the basis of these data on the toxicology of various pollutants to develop strict standards, the residue in the scope of this standard, is considered to be safe. For example, the current EU on infant formula milk powder of dioxin residues limits are 3ppb (that is, three parts per trillion). According to the 2003 EU market for infant formula checks, dioxin and PCBs in concentrations are below the 1ppb. From now on, in such a low dose, is no hormone action, and will not have a significant impact on health. It is worth noting that the present news stories, a precocious baby girl mostly close to the situation or more than 1 year of age. Considering that infants hospital usually prompts in the child is 6 months after the start adding complementary foods while accesary, eggs, fruit percentage and large, these food ingredients may contain residues of environmental pollutants, so there may be a source of estrogen. □ Liu Jing (Zhejiang University Associate Professor of environmental toxicology professional)