Animal viscera is rich in trace elements such as iron and zinc, vitamin A, vitamin B2 and vitamin D, which can effectively supplement the human body's demand for these substances after eating. Moreover, some animal viscera are like chicken gizzards and duck gizzards, because protein is equivalent to chicken and duck meat, but its fat content is only 1/5 of that of chicken and duck meat, so it can be said that it is very healthy food, and almost everyone can eat it. Children who are growing up are prone to zinc deficiency and need to eat animal viscera. In addition, some people who use their eyes too much can also effectively improve their eyesight by eating animal offal. Although animal internal organs are important, they should not be eaten unscrupulously. This is because livestock and poultry are fed with industrial feed, which is uncertain. Once unsafe food is eaten by animals, some harmful substances such as pesticides and heavy metals will be deposited in the liver, which will affect people's health. In addition, excessive consumption of animal viscera can easily lead to vitamin A and vitamin D poisoning. Therefore, animal viscera should not be eaten, but it should be eaten less, twice a week, and each person should not eat more than 50 grams each time. Also, because of the high cholesterol content in animal viscera, people with hyperlipidemia had better not eat it, and people who are fatter had better eat less animal intestines because of their high fat content. In addition, because the internal organs of fish are easy to pollute and deteriorate and contain many harmful microorganisms, they must not be eaten. Besides the internal organs of animals, animal blood is also one of the foods that many people like to eat. So, how much nutritional value does this food have? Because the blood of poultry and livestock is rich in iron, amino acids and other substances, people who need iron supplementation are like menstrual women. Eating more animal blood is very beneficial. However, in order to save costs and meet the needs of molding, some unscrupulous traders will add some harmful substances such as formaldehyde to the blood, so you must be especially careful when eating animal blood.