Donate blood twice a year, 400ML each time, is it harmful to your health? (Male, 35 years old)

The total blood volume of an average adult is 4000-5000 ml, and 200 ml of blood donation only accounts for 1/20- 1/25 of the total blood volume. 20%-25% of blood in human body is stored in "blood banks" such as spleen, liver, lung and skin. Spleen is the largest "blood bank" of human body, which can store 20% of the total blood volume of human body. When human blood circulation needs blood, the spleen will continuously release blood to blood vessels and participate in blood circulation. About 2 billion red blood cells age and die every day. The average life span of white blood cells is about 7- 14 days, and platelets are also 7-9 days. Under certain conditions, the hematopoietic function of bone marrow can be improved to 6-8 times of normal. A healthy person produces about 200 billion red blood cells and120 billion platelets every day, that is to say, each healthy adult adds blood cells every year equivalent to the total amount of human blood cells. After donating 200 ml of blood, the human body will be replenished soon, and it will never affect health. Blood is a kind of fluid tissue that circulates in the cardiovascular system under the impetus of the heart. It is an important part of human body, accounting for about 7-8% of body weight. A person weighing 50 kilograms has a total blood volume of about 3000-4000 ml. Under normal circumstances, only 80% of this blood runs in blood vessels, and the other 20% is stored in the liver and spleen for emergencies. A normal person's blood donation or traumatic bleeding of 300-400 ml at a time will not affect human health, because the reduction of blood volume will stimulate the hematopoietic function of red bone marrow. If the nutrition is proper after blood transfusion, the water in the blood can be replenished in two to three days. Within a month, iron, protein, vitamins, folic acid, etc. It can also be gradually restored, and the core component hemoglobin can also be restored to the amount before blood donation within two to three months. Therefore, a blood transfusion of less than 400ML for healthy people will not affect their health.

Citizens who meet the requirements for blood donation will never donate 200-400 ml at a time.

Sounds healthy. This can be explained from the following aspects:

(1) From the point of blood volume, the total blood volume of an adult accounts for about 8% of the body weight, that is,

An adult weighing 50 kg has a total blood volume of about 4000 ml.

Donate 200-400 ml of blood each time, only accounting for1/20-110 of the total blood volume of the whole body;

② From the point of blood circulation, the blood in adults does not completely flow in blood vessels.

About 20%-25% is stored in "blood bank", that is, organs such as liver and spleen.

Only in an emergency will the blood in the blood bank be mobilized to participate in blood circulation.

While maintaining the physiological balance of blood;

③ From the point of blood metabolism: Like other living things, blood goes through a metabolic process of rebirth, maturity, aging and death. As for the main cells of blood, the longest life span of red blood cells can only be 65438 0.20 days, white blood cells 65438 0.3 days and platelets 8-9 days. Under normal circumstances, about 40 ml of red blood cells in everyone's blood die of aging every day, and a corresponding number of red blood cells are regenerated. Therefore, donating 200-400 ml of blood at a time is not only ineffective, but also does not need to mobilize the blood in the "blood bank" too much. On the contrary, it can stimulate blood regeneration.

How long does it take to return to normal after donating 200-400 ml of blood at a time?

According to the observation of blood donation at home and abroad for many years, almost at the same time of blood donation, blood recovery began. First of all, the blood in the "blood bank" of the body will be released immediately to participate in blood circulation. In addition, the water and sodium salt in blood recovered within 1-2 hours after blood donation, the blood protein recovered within 1-2 days, and the red blood cells recovered slightly, and it took about 10 days to reach the number before blood donation.

In a word, it takes about 10 days to donate 200-400 ml of blood and all blood components will return to normal.

The nutritional supplement after blood donation is generally appropriate to increase various nutrients necessary for hematopoiesis. Hematopoietic raw materials mainly include protein, iron, folic acid and vitamin B 12.

Foods containing high-quality protein are: milk, lean meat, eggs, bean products, etc.

Foods containing more iron include: animal liver, jellyfish, shrimp, sesame, kelp, auricularia auricula, laver, mushroom, pea, jujube, longan and so on. In addition, you can choose an iron pot when cooking.

Foods containing more folic acid are: pig liver, pig kidney, beef and so on.

Foods containing vitamin B 12 are: animal liver, pig kidney or sheep kidney, fermented bean curd, etc.

In short, you don't need to eat anything special after donating blood, as long as you eat scientifically and reasonably, have nutritional value, are delicious, comfortable and moderate, you can recover the lost blood in a short time.