Duck blood-Duck blood has a high nutritional value, and is rich in protein and various trace elements, such as iron, copper and calcium. Low in fat, low in calories, high in fiber, cholesterol-free, high in iron content, rich in nutrition, and has the effects of enriching blood, protecting liver, removing garbage and toxins from the body, nourishing and caring skin. Pig blood: 1. Pig blood contains a high amount of iron, and it exists in the form of heme iron, which is easy to be absorbed and utilized by human body. Children in the growth stage and pregnant or lactating women eat more dishes with animal blood, which can prevent iron deficiency anemia and effectively prevent middle-aged and elderly people from suffering from coronary heart disease and arteriosclerosis. 2. Cobalt contained in pig blood is an important trace element to prevent the growth of malignant tumors in human body, which is difficult to obtain in other foods; 3. Pig blood contains vitamin K, which can promote blood coagulation, so it has hemostatic effect; 4. Pig blood can also provide a variety of trace elements for human body, which is beneficial to the aftercare of malnutrition, kidney diseases and cardiovascular diseases, and can be used to treat dizziness, hematemesis and epistaxis, metrorrhagia, traumatic bleeding, convulsions and epilepsy. 5. In addition, pig blood can also remove the damage of dust and harmful metal particles in human body; Modern medical research has found that protein in pig blood, after being decomposed by gastric acid, can produce a substance that can disinfect and moisten intestines. This substance can have a biochemical reaction with dust and harmful metal particles entering the human body, and then take these harmful substances out of the body through excretion, which can be called a "scavenger" of human dirt.