Aging and antioxidants
Science has discovered the reason for the aging process. It is quite complex but there are two major contributing factors.
Firstly, the moment you are born your immune system produces oxidised cells. Oxidised cells are the "first response" to any bacteria, pathogens and free radicals in the body. I won't go into what each of these are, but suffice it to say, they are "foreign bodies" in our physiology (we also get them in our foods and in the air).
The oxidised cells play a big part of keeping us healthy. However, oxidation is the reason why we keep our foods in tins, bottles and plastic. You see, when food is exposed to air, the oxygen in the air, begins to oxidise the foods and they begin to rot. Oxidation is also the reason metal rusts. Any form of cell deterioration is a result of oxidation.