Is donating blood harmful to the body?

Some blood collection points have slogans: "There are many benefits to blood collection, and apheresis has more benefits than total collection"; "Blood is the same as well water, even if you draw several buckets, it will still be the same amount"; "Collecting more blood will not increase the cost. blood pressure". . . This reminds me of a long-standing confusion: Is donating blood harmful to the body?

A commonly accepted statement in society is that blood can be regenerated, so donating a small amount of blood will not cause any harm to the body. This kind of view has taken various forms everywhere, for example: donating blood is good for health, donating blood is conducive to enhancing people's hematopoietic function, etc. In order to encourage the public to donate blood for free, various places use medical experts to prove the various benefits of appropriate blood donation to the body. It is common for a person who has been donating blood for many years to be promoted as a role model, which further demonstrates the official support for this view.

Blood is a renewable substance in the human body and has its own metabolic process. As a hematopoietic organ, the spinal cord continuously produces blood to maintain normal circulation. When the human body loses blood due to various reasons, the spinal cord will speed up hematopoiesis to repair the damage to the body. The enhancement of hematopoietic function caused by this passive repair is nothing more than the human body's instinctive self-protection. But in reality, it is said that "donating blood is good for health and helps enhance people's hematopoietic function." The self-harm behavior of drawing blood has become something worth doing proactively.

The question is, even if blood donation really increases hematopoietic function, do people need this enhanced function? Does this enhanced function have any benefits for the human body? If this is called good for health, we can also say that blinding the eyes is good for health, and chopping off the hands is good for health! For it is evident that a man who is blind has an enhanced sense of hearing and touch, and a man who has no hands has a more sensitive feet. For those who do not have the opportunity to donate blood, should we tell them that for your own health, you should bleed yourself regularly?

I have heard of such a thing. Some people who make a living by selling blood have excessive hematopoietic function because of the frequency and quantity of blood drawn. If they do not draw blood regularly, they will You will feel blood swelling and your body will not be able to bear it. I don’t know exactly how much damage is caused by this excessive blood drawing, but can we say that this is not a consequence of enhanced hematopoietic function?

I believe that blood donation is a kind of harm to the human body. Even a moderate amount of blood donation will only bring harm rather than better health. Although, in order to save the lives of others, we are willing and should make some sacrifices. This approach is noble and worthy of encouragement. But I just can't accept this kind of deception. In order to get more people to donate blood, we preach to the public that donating blood is good for health. I can't help but feel that the purpose of this kind of propaganda is actually very insidious.

Although I believe less and less in so-called science, I am still willing to listen to the opinions of medical experts and ask them to prove to me how blood donation can make the body healthier?