1. Iron
Iron is a trace element needed by human body. Generally, the iron content in human body is 4.2g ~ 6. 1g, 70% of iron in human body exists in the form of hemoglobin and myoglobin, 25% exists in the form of ferritin in liver, kidney and bone marrow, and a small amount of iron is an auxiliary factor of oxidase. Iron in hemoglobin is the carrier of oxygen in human body. It transports the oxygen absorbed by the lungs to all tissues of the whole body for cell oxidation, and transports the carbon dioxide generated by cell oxidation to the lungs and exhales. If the human body is short of iron, it will cause anemia, and the function of muscle cells to use the energy generated by oxygen will decrease, thus reducing the source of heat. Adult men need to take about 10mg of iron from food every day. Foods containing more iron include animal liver, heart, lean meat, egg yolk, laver, kelp, black fungus, celery, rape, tomato and so on. Protein and vitamin C in the diet can improve the absorption rate of iron. However, there are a lot of vegetables in China's diet, and they are still an important source of iron.
2. Manganese
Manganese is an essential substance for normal bones and a very important substance for making thyroxine. It can fully digest and absorb food, relieve nervousness, relieve fatigue, enhance memory and prevent osteoporosis. Adults can take 2mg-5mg every day to meet the needs. It will be poisoned if it exceeds this amount. Nuts, red-leaf vegetables, peas, beets and unrefined grains are all foods rich in manganese. People who are often dizzy, in a trance or have poor memory, and people who often eat a lot of milk or meat should increase their intake of manganese.
3. Zinc
Zinc is one of the most important trace elements in human body, mainly concentrated in liver, muscle and skin. When zinc is deficient, it will cause loss of appetite, low immune function, dim eyes, rough skin, easy infection, anemia, decreased vision, dull hair, and even hepatosplenomegaly, leading to developmental retardation. Some girls have more facial acne and acne, which is also related to zinc deficiency. Zinc deficiency can also be supplemented by food. Some animal foods, such as oysters, fish, animal livers, meat and eggs, contain a lot of zinc. The tissues with the highest zinc content are the visual part of eyeball and prostate. Zinc participates in the metabolic process of nucleic acid proteins, which can promote the normal development of skin, bones and sexual organs and maintain digestion and metabolic activities. Zinc deficiency in developing children can cause loss of appetite, growth stagnation, slow sense of smell, sexual dysfunction and so on. Therefore, people call zinc "the element of life". Zinc is abundant in meat, animal liver, eggs and seafood, especially oysters. Secondly, milk, cereal, corn and pumpkin seeds also contain zinc. When it works with vitamin A, calcium and phosphorus, the effect is the best.
4. Chromium
Chromium salt is a toxic substance, but a small amount of chromium metabolizes sugar under the synergistic effect of insulin, which is helpful to transport it to protein, and has the functions of promoting development and preventing hypertension and diabetes. The human body has little demand for chromium. Eating foods containing chromium such as beef liver, malt, yeast, chicken, corn oil and clams can make up for the deficiency of chromium.
5.germanium
Germanium has many functions in human body. First of all, it has the ability of deoxygenation, and can keep enough oxygen in the body to maintain human health. The most remarkable is the anticancer effect of organic germanium (carboxyethyl germanium trioxide). Organic germanium can be combined with "waste" of human body, and excess protein and cancer cells in the body and blood vessel wall will also be adsorbed. After 20 ~ 30 hours, the germanium carrying "waste" will be automatically excreted.
6. Copper
Normal adults contain copper100-200mg. Its main function is to participate in the hematopoietic process; Enhance disease resistance; Participate in the formation of pigment. Copper is high in liver, kidney, fish, shrimp and clam of animals. Fruit juice and brown sugar also have a certain content. When the copper content in the body decreases, it will affect the absorption of iron, lead to the obstacle of iron utilization, and finally lead to iron deficiency anemia. Copper is also closely related to the elasticity and moisture of human skin. When copper is deficient, it will cause girls' dry and rough skin, pale face, decreased immunity and even affect their reproductive function in the future.
7. Cobalt
Cobalt is an important component of vitamin B 12. Cobalt plays an important role in protein, fat, carbohydrate metabolism and hemoglobin synthesis, and can dilate blood vessels and lower blood pressure. However, excessive cobalt can cause polycythemia, gastrointestinal dysfunction, deafness and myocardial ischemia.
8. molybdenum
Molybdenum is widely distributed in human body. The total amount of molybdenum in adults is about 9mg, with the highest content in liver, followed by kidney. Recent studies show that molybdenum deficiency can lead to nervous system abnormalities, mental retardation and affect bone growth. More seriously, the reduction of molybdenum content in human body can increase the incidence of esophageal cancer. As we all know, nitrosamine carcinogens are an important factor in inducing esophageal cancer. The precursors of nitrosamines are nitrite and amine, and nitrosamines are synthesized under appropriate acid-base conditions. Nitrite mainly comes from NO3- in the environment. Reducing the source of NO3- is an effective measure to prevent the high incidence of esophageal cancer. Molybdenum is a useful anticancer element, which can effectively reduce the precursors NO3-and NO2-of nitrosamines and inhibit the formation of nitrosamine carcinogens. Molybdenum intake is related to diet. Animals' liver and kidney, grains and beans are rich in molybdenum, which is really a good product for molybdenum supplementation.
9. vanadium
Normal adults, * * * contains about 25mg of vanadium, and the content of vanadium in blood is very small. Most of the vanadium in human body is concentrated in bones and teeth. Vanadium can stimulate human hematopoietic function, increase hemoglobin and red blood cells, and improve human hematopoietic function. Vanadium can also inhibit the synthesis of cholesterol and reduce the degree of arteriosclerosis. If the content of vanadium in human body is reduced, it will lead to abnormal bone development, slow growth and impaired reproductive function. In addition, both enamel and dentin belong to hydroxyapatite, and vanadium can replace hydroxyapatite to prevent caries.
In short, although metal elements are very important in human life activities, excessive intake will do harm to human body. As long as we pay attention to the reasonable adjustment of diet structure in daily life and do not have a partial eclipse, we can get metal elements that meet the needs of normal human body.