Why is it getting cold! ! Why do people die! !

It is a natural law that the weather will get cold. Why people die is a natural phenomenon. There are four kinds of sayings: 1, cell division and limited reproduction times. In old age, the generation of new cells is less than the death of aging cells, so the functions of various parts of the human body decline and it is easy to get sick. Death 2. There are good cells and bad cells in the human body, among which there is something called free radicals, which will make people aging. When you are young, there are many substances in your body that can fight free radicals and keep you young. However, when the number of free radicals increases in middle-aged and old people, people will become old (research shows that eating more tea polyphenols in vegetables, fruits and tea can reduce free radicals). 3. Human nerves (nerve endings) will begin to shrink in middle age and old age, which is not conducive to cell reproduction and leads to a decrease in the number of new cells (similar to 1). 4. Some scientists have suggested that the life span is 1500 years, but urban pollution, food problems, nutrition problems, personal emotional problems and physical health problems are all reducing the life span of human beings, especially emotions (so you will lose your head after laughing for ten years). When the value is 0, people will die. Psychological factors are also related, and there are some accidents and so on.