Kill pathogens or terrain modify?

Rife and the doctrine work by killing pathogens through certain frequencies, vibrating them in to pieces, but what about modifying the inside of your body so there isn't a 'home' for them to live?

In the video below he states that we shouldn't kill the parasites that are in our body and that we should modify our body so as there isn't a habitat for them to live and they are basically starved out. I find a lot of what he says to be true, what are peoples thoughts on the two different approaches?