Why do people age?

Aging refers to the process of general and gradual decline in the function of various organs of the body.

There are two different conditions of aging, one is the physiological aging that occurs under normal conditions;

The other is pathological aging caused by disease.

It is a law of nature. However, when people adopt good lifestyle habits and health care measures, they can effectively delay aging and improve their quality of life.

Aging is caused by the cessation of activity of genes in the nucleus of human cells. The nuclear unit is made up of deoxyribonucleic acid. It determines the morphological structure and physicochemical properties of the body, and governs the functional activities of the body and cells.

As we age, genes stop moving for a certain period of time, so that tissue cells stop growing and enter the process of decline and aging. Free radicals lead to senescence . Free radicals are a kind of material molecules, which are short-lived and have a strong reaction ability, and free radicals will appear in the organism at any time, causing some peroxidation reactions, producing harmful chemical genes, so that the biological macromolecules in the cell are combined into substances that are not easy to dissolve, hindering the transportation of cellular metabolic nutrients, which causes the aging of the body.

Aging due to endocrine decline. As the human body ages, aging is caused as a result of endocrine degeneration of the pituitary gland, thymus, thyroid, etc. After the age of 40, the hormone level in the body gradually decreases, the estrogen level of the elderly in women is reduced by 90%, and the monoammonia oxidation can control the secretion of hormones.

Recently, according to the American "Daily Health"**, doctors found that there was fat in the bones of some elderly people when they did a physical examination, and the older they were, the higher the fat content in the bones. "When you're born, there's almost zero fat in your bones," says Dr. Jeffrey Jimbo of the Pennington Biomedical Research Center at Louisiana State University in the United States. But he added that after the age of 30, more than half of the bone marrow cells have been replaced by fat.

And as we age, almost all bone marrow cells eventually turn into fat, so the number of bone marrow cells in the bones decreases and the amount of fat increases. More and more scientists have found that there are two main reasons for the increasing fat in bones: one is that there is a stem cell in the bone marrow, which can be turned into fat or bone marrow.

People with osteoporosis have stem cells in their bodies that turn into fat more easily than healthy people, so their bones have much higher levels of fat. Second, after menopause, the level of estrogen in the body decreases, which also leads to an increase in the amount of fat in the bones. Based on this finding, some scientists have tried to intervene in the growth of this stem cell by forcing it to turn into bone marrow instead of fat.

At present, scientists have found through laboratory research that it can activate a protein in the human body to drive stem cells to grow according to the "specified requirements", which can avoid the bone marrow being constantly replaced by fat, resulting in too high fat content in bones.

The aging process continues from the fertilized egg to death, and it is only at a certain stage that the characteristics of aging become more apparent.