Is it good for you to seek medical advice online and donate blood for free?

Since blood transfusion has become a special means of clinical medicine, the scientific community has been studying such a topic-the relationship between blood donation and health. Millions of blood donors in dozens of countries around the world have proved that proper blood donation is harmless to health. In China, there is also a slogan that "blood donation is not harmful to health, just a little courage". But is blood donation "harmless" or "beneficial" to the health of the majority of unpaid blood donors? People at home and abroad have come to the conclusion that blood donation is good for health after a lot of scientific and meticulous investigation and research!

1. Proper blood donation will make people healthier and live longer.

Since entering adulthood, blood cells are mainly composed of bone marrow, and an average of 65.438+0.5 billion blood cells (about 40 ml blood cells) can be produced every day, and a corresponding number of blood cells are aging and dying. The hematopoietic function of bone marrow, like other organs in the whole body, gradually decreases with age. People who insist on long-term moderate blood donation, because the bone marrow hematopoietic system is constantly stimulated, maintain a relatively vigorous metabolism and constantly produce more energetic young blood cells. The proportion of fresh blood cells was significantly higher than that of non-blood donors.

Scientists have studied the relationship between blood and blood donation by using fluid deformation and hemodynamics, and believe that blood flow is related to blood viscosity, erythrocyte variability, plasma protein concentration and other factors. When the viscosity of blood increases, the blood flow speed becomes slow, local blood stagnates, hypoxia, the activity of coagulation factors increases, nutritional disorders occur, causing changes in blood vessel walls, which is easy to cause thrombosis, cerebrovascular accidents and myocardial infarction, which is called "high viscosity syndrome". Common symptoms include heavy head, dizziness, headache, hearing impairment and abnormal sensory perception of peripheral nerves.

When people donate blood, especially tangible components such as red blood cells and platelets, it will reduce blood viscosity, thus speeding up blood flow, increasing cerebral blood flow and increasing oxygen supply, and people will feel relaxed and clear-headed.

According to the survey of Karl et al, a world-famous medical scientist, 332 blood donors were born before 19 16, and compared with 339 non-blood donors who were born in the same area and were similar in age and sex. The average life expectancy of blood donors is 70. 1 year, while that of non-blood donors is 67.5 years. The results show that the survival rate of blood donors is significantly higher than that of non-blood donors, and people who donate more blood live longer.

Therefore, people who insist on long-term moderate blood donation will be more sober, healthier and live longer. 1997 In March, Philippine President Ramos participated in 4 1 voluntary blood donation (250 ml each time) as a commemoration of his 69th birthday. He often said: donating blood makes him 20 years younger. It seems that this sentence is not all a joke.

Second, blood donation can reduce the incidence of coronary heart disease.

In recent years, neurologists in the Affiliated Hospital of Qingdao Medical College in China made a comparative study on hemorheology of 127 blood donors, 87 hypertensive patients and 60 ischemic stroke patients with the topic of "the relationship between hemodilution and arterial pressure and cardiovascular and cerebrovascular diseases". The results show that blood donation has a good long-term effect on the cardiovascular and cerebrovascular systems, and has a positive preventive effect on reducing the incidence of cardiovascular and cerebrovascular diseases.

1984- 1989 Professor Salonen, an academician of the Finnish Academy of Sciences, and his research team conducted an investigation and analysis on 2,782 men aged between 42 and 60 in China. The results show that the proportion of blood donors suffering from coronary heart disease after five and a half years is 86% less than that of non-blood donors. In another top study, 532 blood donors who donated blood 1- 12 times were followed up, and only 1 person had acute myocardial infarction. At the same time, compared with 2306 non-blood donors, 226 people developed acute myocardial infarction, the incidence rate was as high as 9.8%.

It is obviously different from the blood donation group.

After a follow-up survey of 655 blood donors and about 3,000 non-blood donors, the Cardiovascular Disease Research Group of the University of Kansas Medical Center found that the risk of cardiovascular disease in men who donated blood in the past three years was only 1/2 of that of non-blood donors, and the risk of some cardiovascular diseases was only 1/3 of that of the latter.

The researchers explained that this phenomenon is related to the reduction of iron storage in the body. Iron can catalyze the synthesis of oxidase in human body. After blood donation, the iron storage in the body can be significantly reduced. Every 500 ml of blood donated by a blood donor is equivalent to discharging 200-500 mg of iron, so the oxidase synthesized by the human body is correspondingly reduced, so that the fat in the blood is less, thereby reducing the deposits attached to the blood vessel wall and reducing the incidence of cardiovascular diseases.

The research results of scientists in China, Finland and the United States show that the risk of cardiovascular disease in men who have donated blood will be greatly reduced. To this end, Finnish doctors suggest that men donate blood at least once a year, which is conducive to preventing themselves from suffering from cardiovascular diseases; Helping others is a good thing to kill two birds with one stone.

Third, blood donation can reduce the incidence of cancer.

Iron is one of the indispensable elements for human body, but too high iron content is not a good thing. According to a recent report in the International Journal of Cancer, if the iron content in men exceeds 10% of the normal value, the probability of cancer will increase.

As for women, due to menstrual bleeding, they often lose a lot of iron. Therefore, there is no special relationship between iron content and the probability of cancer in women.

So, how do men excrete too much iron in their bodies to reduce the risk of cancer? The doctor thinks that the only way is to discharge too much iron by bloodletting. Therefore, it is good for people and themselves to encourage men with too high iron content to donate blood regularly.

Fourth, blood donation can purify people's minds.

Sanskrit says: Saving a life is better than building a seven-level pagoda. It means that saving lives is a good thing with boundless merits. Giving kindness will naturally make you feel gratified in the process of helping others. At the same time, a person firmly believes that living in the world is beneficial to others and society, which will eliminate inferiority complex and enhance self-confidence in life. Doing good can balance mental state, and a balanced mental state is the basis for preventing many diseases. Scientists have also found that the thought and behavior of helping others and being kind to others is conducive to the establishment and improvement of the function of human immune system, and the role of emotions on the immune system is obvious. Healthy emotions communicate with the brain and other tissues and organs through the nervous system, body fluids and endocrine system, which makes them in a benign dynamic balance state and enhances people's anti-infection ability, thus avoiding the occurrence of various diseases. Therefore, doing good deeds and doing good deeds is not only helping others, but also helping others. There is a blood donation poster in Hong Kong with the slogan "It is more blessed to give than to receive", which means this.

Voluntary blood donors continue and save others' lives with their own blood, which embodies the noble sentiments of human beings to live together, cherish life, love and help each other. Blood donation soothes the soul and makes life more fulfilling and happy. Maintaining a full and happy mood is one of the essential factors for health and longevity.