现代人脑约重1300—1500克,只占体重的五十分之一,但它却需要人体血液的五分之一。据测算,人脑血管全部连接起来,总长约240公里,由于脑细胞特别娇嫩,功能又非常复杂,代谢率较高,所以血流量也较高,脑血管存在一种“自我调节”机制,使脑血流保持相对稳定状态,如果大脑缺氧一分钟,就会昏倒,缺氧五分钟大脑皮质细胞就会死亡。缺乏必要的脂肪酸会导致大脑发育障碍。 Modern people weigh about 1300-1500 grams of the brain, only one-fiftieth of the weight, but it needs one-fifth of the body’s blood. It is estimated that all human blood vessels are connected, total length of about 240 kilometers, due to the particularly delicate brain cells, the function is very complex, high metabolic rate, so the blood flow is higher, there is a “self-regulating” mechanism of cerebrovascular Cerebral blood flow to maintain a relatively stable state, if the brain hypoxia for one minute, it will faint, five minutes hypoxia cerebral cortical cells will die. The lack of essential fatty acids can lead to brain development disorders.