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Maybe there is a single cell inside an organism that is unchanged,but the rest of the cells are changing.
We say then that this organism has a dead cell.,but the organism as a whole is alive.
When somebody is studying the phenomenon of viruses ,he can see that when viruses are not coming in contact with a host organism, they are a sum of chemical compounds that not fulfill the criteria to be considered as life.
While on the other hand they start reacting with a host, or in other words they start making chemical reactions with the compounds of the host,they become alive.
As a result we can say that in a theoretical basis,if an orgasism eated exactly a certain amount,quality and quantity of foods in acertain way,then it could prevent the changing of its reactions and as a result it could prevent the aging process,expanding its lifespan.
Of course this is something very difficult to happen in real life because there are numerous things that plays their role and of course things are not that simple.
Lets consider now a very simple organism that is composed from the reactions : A B--}C D--}E F…………--}Y Z.
Lets say that A and B are food supplements and Y and Z are compounds expelled from the organism.
In the same manner we can say that all living organisms are a sum of chemical reactions that start with digestion,and end with the waste products of metabolism.
The RNA World hypothesis has long stated that "life" existed before cells. Aging is a property of multicellular organisms, not unicellular ones.
In this hypothesis, "life" is a set of RNA molecules that catalyze their own synthesis. Only a FEW of the chemical reactions are changing in the cells in our bodies.
One important clue that suggests that what we said is true, is the recent discovery that living organisms that follow a calorie restricted diet,can expand their lifetime, in some cases as long as 60 per cent.
This is not a proof that what we said is true,but it is positive to find that the changing of caloric menu has as a result a change in the lifespan.