I have tremendous regard for Dr. Rudman. However, I wonder how he has reached the conclusion that he seems so certain about. Indeed, what experimental model CAN be used to ascertain "how much and for how long" ( sic ) is necessary. Until such model is verified and subject to study, all of the information that represent opions might be just that: Opinions without a firm basis in fact. I am NOT trying to be critical or dismissive, but once more, only posing questions that appear to have no answer that is based upon scientically verifiable facts.