One more thought
So far as the research shows, small amounts of animal protein, very small, is not a problem in this regard but no one knows for sure. As mentioned though, even small amounts of mercury can be a big problem...
No matter what the research shows, it shows it for the broad population, statistically. That means when it gets down to any one particular person, for example me, going by statistics or "odds" means were not in Kansas any more, we are in Las Vegas! Russian Roulette anyone?
I personally have a number of risk factors in my personal and family history that would likely make the odds determined by the research, much too "generous" in my case.