Does donating 400ml of blood for the first time have any impact on the body?

Generally, donating blood for the first time with 400 milliliters has no impact on the body, but it is necessary to rest and avoid strenuous exercise after donation. Typically, the blood volume of the human body accounts for 70%-80% of the body weight. If 400 milliliters of blood is donated, it accounts for 10% of the body fluids and generally does not have an impact on the body. However, if the loss of blood volume exceeds 20% of the body, shock may occur. If 400 milliliters of blood is donated for the first time, the next donation should be spaced more than half a year apart to avoid harm to the body. After donating blood, it is necessary to rest promptly and eat sugary cookies or drink brown sugar water to replenish energy and relieve discomfort. At the same time, the puncture site should be pressed firmly with fingers and not rubbed to prevent bleeding. Avoid bathing for a short period of time to prevent the puncture site from getting wet and causing infection. Donating blood once a year can promote the regulatory system in the body of blood donors, releasing blood temporarily stored in organs such as the liver and spleen, and promoting blood circulation. For people who donate blood regularly, donating blood every year can also stimulate the bone marrow, making it more active in hematopoiesis, and at the same time enhancing hematopoiesis and regenerative abilities.