Eating deep red animal viscera can help people with iron deficiency anemia to supplement iron, because viscera not only has high iron content, but also has high absorption and utilization rate. Liver can also help some people improve their eye health, because the content of vitamin A in animal liver is particularly high, which can effectively prevent and treat eye diseases such as night blindness, dry eye and keratomalacia. The liver is also the base camp for nutrient storage, which contains all 13 vitamins needed by human body, especially vitamin A, vitamin D, vitamin B2 and vitamin B 12. Protein in the liver exceeds the content of lean pork, and trace elements such as iron, zinc, copper and manganese are very rich, which is almost the most complete and abundant food in nature.

The fat content in the livers of fattening animals such as fat duck liver and fat goose liver is relatively high, usually reaching 10%~30%, which is equivalent to that of fat cattle and other foods. The fat content of normal liver is lower than 5%, which is lower than that of lean pork, and it belongs to high protein and low fat food. Healthy kidneys are also high-protein and low-fat foods, while the fat content of the heart is equivalent to that of ordinary meat. Because the liver is the place where cholesterol is synthesized in organisms, its cholesterol content is usually 3 ~ 4 times that of lean meat.

Extended data:

The liver is like a huge "chemical factory". It is the most important organ for nutrient synthesis and detoxification in animals. All kinds of toxins are sent to the liver for treatment. Kidney is the detoxification organ of animal body, so it is difficult to avoid dealing with poisons. Therefore, the statement that "eating liver will be toxic" is not entirely alarmist. These harms to the liver are based on diseases of animals themselves, overuse of veterinary drugs, or pollution of feed water sources. So is the kidney. Generally speaking, if you eat products that have passed the inspection and quarantine, you will not be poisoned as long as you pay attention to controlling the intake and cooking methods.

References:

People's Network-Is animal liver nutritious?