白发和皱纹是看得见的衰老,一些看不见的衰老更应引起我们的重视,比如人脑。随着年龄的增长,人脑机能会逐渐退化。科学研究显示,人到40岁以后脑细胞数目会逐渐减少,50岁可减少20%,70岁后减少20%~30%。同时,脑的重量也越来越轻,正常人脑重约1500克左右,而80岁老人的脑重量比其减少10%左右,出现“脑萎缩”。 White hair and wrinkles are visible aging, some invisible aging should arouse our attention, such as the human brain. As you grow older, your brains deteriorate. Scientific research shows that when people reach the age of 40, the number of brain cells will gradually decrease, reducing 20% ​​at 50 years of age and 20% -30% at 70 years of age. At the same time, the weight of the brain is also getting lighter and heavier. The normal brain weight is about 1500 grams, while the weight of the 80-year-old is about 10% lower than that of the brain.