It is the activity of the genes that changes - not gene changes. ie it is not saying that your DNA changes and so your genes are altered, it is saying that the physiology of your cells changes because various different genes are turned on or off or are more active and so producing higher levels of various proteins. Basically it is nothing new and is just the way the body works... Change anything in the system, and the gene activity will change to compensate.
Last edited by GS-Alpha; 26th Feb 2013 at 15:57.