Experts introduced that, according to the current blood lead standard in China, more than 10 micrograms per deciliter is high lead, more than 20 micrograms belongs to the level of lead poisoning, and generally within 5 micrograms, which belongs to a safer range. When the blood lead value is below 5 micrograms per deciliter, intervention is generally not required. Between 5-10 micrograms, i.e., between the safe range and the high lead level, the doctor will generally provide health education to parents, which mainly focuses on how to reduce the intake of lead and promote the elimination of lead. If the blood lead level is above 10 micrograms per deciliter, it can be treated with some medications. Parents are also helped to look for possible sources of lead contamination. Compared with the past, there are more parents checking their children’s blood lead in hospitals nowadays, because people’s health awareness has generally increased, and there is quite a lot of related science education, as well as some advertisements for lead-eliminating products, which have made parents more aware of the hazards of lead, and more concerned about their children’s blood lead levels. “And some parents will be in this regard, for example, their children do not study well, attention is not too focused, parents will think, there is no lead poisoning problem, because the Internet said so, parents will be very important, deliberately bring their children to check the blood lead.” According to the current blood lead standard in China, more than 10 micrograms per deciliter is high lead, more than 20 micrograms belongs to the level of lead poisoning, and generally within 5 micrograms, which belongs to a safer range. When the blood lead value is below 5 micrograms per deciliter, intervention is generally not required. Between 5-10 micrograms, i.e., between the safe range and the high lead level, the doctor will generally provide health education to parents, mainly on how to reduce lead intake and promote lead elimination. If the blood lead level is above 10 micrograms per deciliter, it can be treated with some medications. Parents are also helped to look for possible sources of lead contamination. Compared with the past, there are still more parents checking their children’s blood lead in hospitals because people’s health awareness has generally increased, and there is quite a lot of related science education, as well as some advertisements and campaigns for lead-eliminating products, which have made parents more aware of the dangers of lead and more concerned about their children’s blood lead levels. “And some parents will be to this aspect of the right, for example, their children are not good at learning, attention is not too focused, parents will think, there is no lead poisoning problem, because the Internet are so said, parents are very important, deliberately bring their children to check the blood lead.” 1, how does lead enter the human body? 85% of children ingested through the hand-mouth route The most common route of lead intake is the digestive tract, through the hand-mouth route, according to statistics, the proportion of children ingesting lead by this route is about 85%. Some children often gnaw their hands, bite their nails, and put toys into their mouths; and lead dust such as dyes, paints, prints, individual cosmetics or the environment can stain the hands of children while playing, and children’s fingernail crevices are particularly easy to hide the parts of the lead dust, so it is easiest for lead to enter the children’s body through the hand-oral route. Lead is absorbed from the small intestine into the bloodstream by both active transport and passive diffusion in the intestinal tract. Active transport is the binding of lead to a transporter protein in the intestinal mucosa, which acts as a carrier to transport lead into the bloodstream, accounting for more than 80% of the total amount of lead absorbed. Passive diffusion is the natural diffusion of lead from the intestinal lumen to the blood, and the higher the concentration of lead in the intestinal lumen, the greater the amount of passive diffusion. Research has proved that, because lead and calcium, iron and zinc enjoy the same site in the intestinal absorption process of transporter proteins, in the process of absorption has a competitive, therefore, improve the dietary calcium, iron and zinc content, can have the effect of reducing the absorption of lead in the intestinal tract. The second is lead ingested through the respiratory tract, with vehicle exhaust and renovation pollution being the two main sources. After airborne lead dust is inhaled into the respiratory tract through the nostrils, a part of it is blocked by nasal hairs, tracheal cilia and bronchial cilia, fine bronchial cilia, and finally returns to the oral cavity in the form of sputum, which is then swallowed into the digestive tract by children. Another part of the particularly tiny lead dust reaches the alveoli, where it is deposited and then absorbed by phagocytes, for example, and enters the bloodstream. Still another route is skin contact, as in the case of workers engaged in lead work, where lead can be absorbed directly through the skin. After airborne lead-containing dust is inhaled into the respiratory tract through the nostrils, a portion of the particularly tiny lead dust reaches the alveoli, where it is then absorbed by phagocytes, etc., and enters the bloodstream. Lead Excretion Trace Elements Since lead and calcium, iron and zinc enjoy the same site of transporter proteins during intestinal absorption and compete with each other in the absorption process, increasing the amount of calcium, iron and zinc in the diet can effectively reduce the absorption of lead in the intestinal tract. Daily Diet Foods that help eliminate lead include garlic, onion, kiwi and green bean soup. You can also consume some foods that are high in zinc, iron and calcium, as the intestines will absorb them to their advantage, and the absorption of lead will be reduced. Foods high in iron include lean meat, animal liver, animal blood, etc. Foods high in zinc include lean meat and seafood. In addition, children should not be picky about what they eat, and all aspects of nutrition are better, also has a protective effect. 2.Why should children pay more attention to excessive blood lead? Children’s absorption rate of lead is about 5 times that of adults There is intake of lead, there is discharge. Lead can be ingested through the digestive tract, respiratory tract, etc., can also be discharged from urine, feces, etc., and respiration can also discharge lead. In fact, everyone has the ability to discharge lead, but the child is weaker, according to research, children’s absorption rate of lead is 5 times that of adults, but the ability to discharge lead is only 1/17 of adults. If the child ingests more lead, and discharge is slow, it will accumulate in the body, and eventually lead to chronic lead poisoning. In addition, most of the lead dust is suspended in the air below 1 meter from the ground, where the concentration of lead in the air is about 16 times higher than that above 1 meter, which is exactly the same as the height of the child’s breath, so the lead ingested into the body by the child through respiration is much higher than that of an adult, and children living on low floors are more likely to suffer from lead poisoning.