Analysis:

The human body is composed of more than 80 kinds of elements, which can be divided into macro elements and trace elements according to their different contents in the body. One ten thousandth of the total weight of human body is divided into macro (normal) elements and trace elements, and those that account for more than one ten thousandth of the total weight of human body are called macro (normal) elements, such as oxygen, carbon, calcium, hydrogen, phosphorus and magnesium. Trace elements that are indispensable for maintaining normal human life activities are called essential trace elements. When I say indispensable, I mean that the lack of it will cause abnormal physiological functions and structures of the human body and lead to the occurrence of diseases. Most scholars agree that there are 14 kinds of essential trace elements for human body, namely iron, copper, zinc, cobalt, manganese, chromium, molybdenum, nickel, vanadium, tin, silicon, selenium, iodine and fluorine. Zinc, copper, iron and calcium are closely related to children's growth and development and are often lacking.

Treat diseases with iodine, and treat diseases with zinc, manganese, selenium, chromium and copper. The vast areas in northeast, northwest and southwest are short of selenium, Jiashi County in Xinjiang is short of potassium, Linxian County in Henan Province is short of molybdenum, Pearl River Delta in Guangdong Province is short of manganese, Sihui City in Guangdong Province is high in nickel and Guizhou Province is high in fluorine. Selenium deficiency is easy to get Keshan disease, potassium deficiency is easy to get night blindness, molybdenum deficiency is easy to get esophageal cancer, manganese deficiency is easy to get liver cancer, high nickel is easy to get nasopharyngeal cancer, and high fluorine is easy to get skeletal fluorosis. Due to "congenital deficiency", more than 80 million people in China are deficient in selenium, 6,543,800+people are deficient in potassium and 60 million people are deficient in manganese. If we don't pay attention to the results of environmental pollution, it will cause the unbalanced area of trace elements to expand and more and more people will suffer.