Theory of aging
Any life has a beginning and an end. Aging is a phenomenon common to all live species.
Oldness is written in our cells which are programmed to multiply a number of times but never
forever. Some cells will stop multiplying very early, for example nervous cells stop multiplying
themselves long before birth but our body has enough of those cells and our brain functions
normally even if we are older.
Aging process is progressive. Aging manifests mostly physically: skin loses its softness, muscles
lose volume and bones become more fragile.
There are many theories of aging like: autoimmune, the wear and tear, the neuroendocrine, the
genetic control, the free radical, the waste accumulation, death hormone and many others.
The wear and tear theory appeared in 1882 and its adepts thought that the cells and body were
overused and this way they got damaged and you died. They said that we abuse our organs
through alcohol, smoking, high fat diets and stress. But having a healthy lifestyle doesn’t mean
we are going to live forever. Our organs wear out anyway and living unhealthy will just make
them wear out faster.
Free radical theory appeared in 1954. The free radical is a molecule that is different from our
body’s normal molecules and when both come in contact they have a destructive reaction. Free
radicals contribute to our aging process with some form of oxidation so specialists discovered
some substances that will prevent aging called antioxidants. Some of these are vitamin C,
vitamin E and Vitamin A and they are used by our body to prevent premature aging.
The genetic control theory says that it doesn’t mean what we do during life because our death
time already is encoded in our genes so we actually inherit it from past generations.
The neuroendocrine theory is actually a form of the wear and tear theory only it is connected to
the neuroendocrine system. The body of young people produces a great amount of hormones;
hormones not only help us grow but they also take care of our organs and muscle tissue. Old
people have a lower hormone activity and that’s why their muscular mass is lower and their
organs are not functioning well.
Another interesting theory of aging is the Waste Accumulation theory which is based on the fact
that cells produce a lot of waste during our live and it isn’t possible to be totally eliminated in
time. This amount of waste reaches critical levels at the end of our life and kills the cells.
Death Hormone theory is based on the fact that our pituitary glands secret a substance called
death hormones which stops the cells from using thyroxine. Thyroxine is a hormone produced by
the thyroid and it has a strong connection with metabolism. When the cells can no longer use
thyroxine their can no longer convert food into energy properly and this increases our aging