"or it could be that mercury helps to create an environment where yeast will proliferate; ie make it not a great place for the good bacteria etc ..."

Dulak, good point. I read that mercury can sometimes obliterate some of the healthy intestinal flora. I might be a good example for that too because last time I got a stool culture for yeast and bacteria the test showed that I had no bifido bacterium at all (and I even had been supplementing with good quality probiotics). Bifido is one of the good guys and we need lots of it.

SomedaySoon