Mercury in fish harms immune system.

Mercury in fish harms immune system.
http://www.environmentalhealthnews.org/ehs/newscience/2011/09/2011-0927-mercury-fish-immune/

"Adults exposed to methylmercury through a fish diet have immune system changes similar to those seen in more highly exposed gold mine workers, according to a study of Brazilians living in the Amazon River Basin."