as opposed to "Like attracts like?"  It reminds me of that symbol for Yin and Yang.   The black and white one that depicts balance in life and the woman and the man.  That is the way I look at the negative feedback thing.  The body is constantly striving  for a  balance of hormones and how they should be at that particular time of day.  Also, like it is not good Feng Shui to fill your house full of clutter, I would imagine it is not good feng shui to fill your body with hormones at a certain time of day when they need not be there.  If there is not a good feng shui in the home, your life becomes unbalanced.  Same priciple could be applied to our bodies.