1. Animal liver is the main organ for animals to metabolize and store nutrients, and it is rich in nutrients such as protein, vitamins (such as vitamin A, vitamin D and vitamin B) and trace elements (such as iron and zinc). 2。 Animal liver is very rich in iron, for example, 22.6 mg iron per100g pig liver, which is more than 7.5 times that of lean meat. This iron mainly exists in the form of heme iron, which is easily digested and helps to prevent iron deficiency anemia.

3。 The content of vitamin A in animal liver is much higher than that in eggs, milk, fish, shrimp and lean meat. Vitamin A plays a very important role in maintaining eye health, and can effectively prevent and treat eye diseases such as night blindness and dry eye. Animal liver is rich in nutrition and is the most suitable blood tonic. But excessive consumption of animal liver will lead to the accumulation of cholesterol and vitamin A in the body. Older people should not eat more when they have cardiovascular diseases. Animal liver is very nutritious. But the cholesterol content is high, and many people are not suitable for eating more. Such as cardiovascular and cerebrovascular diseases, hyperlipidemia and atherosclerosis. In addition, ordinary people should eat in moderation. The liver is an organ for detoxification. If toxic substances such as heavy metals accumulate in large quantities, liver function will also "collapse" and animals will die of liver failure. Dead animals are generally buried in a harmless way, and you won't buy liver from the regular market. In fact, it is not the foreign non-nutritive substances that are easy to be poisoned in the liver, but the vitamin A it contains.

Recommended intake of vitamins for China residents: The recommended intake of vitamin A for adult males is 800 micrograms, and that for adult females is 700 micrograms. 100g pig liver contains 4972 uGRE, and chicken liver contains 104 14 uges, which is twice that of pig liver. Dietary guidelines for China residents 20 16 recommend pregnant women, especially lactating women, to eat animal liver (pig liver or chicken liver) 1-2 times a week, 20-50g each time. It is worth noting that sheep liver contains vitamin A20972UGRE/ 100g, cattle liver contains vitamin A20220UGRE/ 100g, and the content of vitamin A in cattle and sheep liver is twice that of chicken liver. The content of vitamin A in dog liver varies from person to person. According to the analysis of domestic related liver vitamin A content, the liver vitamin A content of some dogs is as high as 35,870 ugre/100g. If the liver with high vitamin A content often eats too much, it may lead to the accumulation of vitamin A and toxic reaction, especially for pregnant women and pregnant women who consume too much vitamin A, which will lead to fetus or abortion.