Have you ever though who is controlling the world?!
Our answer is - information! Information is intangible, but if it's correct - can make a difference.
Moment of the birth is the beginning. We come to this world "clean" and have no direction. That's the moment when we have clean and healthy information.
When we grow old - we change, together with many changes in our organism. We get ill and this new information and changes are stored in our body.
If there is a chance to keep this part of clear and clean information, even if it's small, wouldn't you preserve? We can never be sure to be safe from different circumstances, and that little cell could bring very huge difference.