These nutritional characteristics of pig's blood are especially suitable for the elderly. The elderly body tends to decline, protein synthesis and metabolism gradually slow, such as hemoglobin synthesis is reduced, and therefore susceptible to senile anemia. It is generally believed that the elderly dietary quality protein should account for about 50% of the total protein, daily per kilogram of body weight needs protein 1 ~ 1.2 grams. Pig's blood contains 8 kinds of amino acids needed by the human body, is the ideal food for the elderly. Pig's blood is rich in iron, which is an indispensable component of the hematopoietic system and can play a role of "blood replenishment" for the iron deficiency anemia easily occurring in the elderly. Pig's blood contains zinc, copper and other trace elements, has to improve immune function and anti-aging effect, the elderly often eat pig's blood, can slow down the aging of the body, ears and eyes. Pig blood also contains a certain amount of phosphatidylcholine (lecithin), inhibit the role of low-density lipoprotein, help prevent atherosclerosis, hypertension, coronary heart disease, hyperlipidemia, cerebrovascular disease, and other patients beneficial. In addition, the elderly due to tooth loss, chewing difficulties, coupled with the decline in digestive function, food can not be fully digested and absorbed, easy to suffer from malnutrition. Pig's blood is soft like tofu, easy to chew, easy to be digested and absorbed. So the elderly often eat pig's blood both nutritious, but also can strengthen the body.