Theories on the Causes of Aging

There exists several theories explaining the process of aging. Each specific case has its specific factor or sometimes their combination.

1) Programmed aging (theory of circadian rhythm). Aging of cells is programmed on genetic level. The number of possible cell splittings are put by the nature once and forever. When cells begin to die faster than to restore themselves, body organs cannot perform all their essential functions anymore.

2) Genetic theory. Cells contain a substance that destroys them at chromosomal level.

3) Structural theory. With age occurs aggravation of condition of connective tissue - it loses its firmness and elasticity which leads to irreversible changes.

4) Theory of free radicals is most popular theory today. The theory suggests that chemical reactions in cells lead to formation of free radicals which cause damage and death of cells. With time the number of dead and non-functional cells increases which breaks work of the whole body.

5) Immunologic theory. With age immune system weakens. Body becomes more vulnerable to infectious diseases and disorders which finally leads to death. Weakening of immune system leads to triggering of autoimmune responses – body detects its own cells as foreign ones and destroys them.