Theories Of Aging: Why Do We Grow Old?
Theories Of Aging: Why Do We Grow Old?
Aging in humans refers to the accumulation of physiological changes over time. These physiological changes generally result from a combination of genetic, chemical, physiological, and psychological factors. There are many theories on the nature and causes of aging such that a new science—gerontology—was developed for the sole purpose of deeply studying the phenomenon of aging.
Currently, there are two major theories on how aging progresses. One theory posits that aging may be considered a disease resulting from the accumulation of physiological damage over time that can be controlled and perhaps eliminated. The other theory maintains that aging is a natural and programmed process whereby changes automatically occur as lifespan milestones or triggers are reached. Proponents of the former [error theory] believe that aging is caused by environmental factors that consequently damage our bodies over time. On the other hand, advocates of the second theory [programmed theory] believe that the human body is designed to age and that there is a biological timeline that all humans follow. There are many indicators that this is so such as genes switching on and off over time, hormonal changes when puberty or post menopausal ages are reached, and the degeneration of the body’s immune system over time. Research indicates that genetics significantly influence the aging process. In fact, some experiments successfully extended—at almost double—the lifespan of genetically manipulated mice and other organisms. The implication of these studies to human lifespan is yet to be established.
As the body ages, most of the organs and systems in the body experience gradual or abrupt changes. Notably, when most people reach a certain age, their immune system becomes less powerful, making them more susceptible to many diseases. With age, the heart muscles thicken and slow down in terms of pumping rate. Lung capacity may decrease by as much as 40 percent. The brain loses more neurons as people age and some of the tissues connecting neurons become less efficient. Muscle and bone mass also decreases. Sensory organs also lose their former acuteness such that old people begin finding it more challenging to see or hear things more clearly.
As age sets in many people feel fatigued and certain illnesses that are common with age can set in. These may include adrenal gland deficiency, heart disease, and blood sugar problems, and cholesterol problems. But certain lifestyle practices positively affect the aging process. Eating foods containing high levels of antioxidants eliminate free radicals that cause damage to cells. Regular exercise significantly minimizes bone and muscle loss. Maintaining a low-cholesterol, or cholesterol-free diet slows the hardening of arteries and reduces the risk of heart disease. Mental exercises and positive thinking have also been demonstrated to extend human life spans.
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Dr Decompte, A belgian, controversial Doctor who has investigated the aging process and found that he would become 1000 years by taking vitamin C in large doses. Unfortunately, he died at the age of 77
Aging is not yet beaten :-<
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This is an accepted fact. Humans die. But many people want to defy death. But only they can do is to pro long life. Understanding life and its end is a must for people. In my case, I tend to live happily as possible as I can.
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