system
Given the following post, respond as if you're commenting on Reddit:
human
Why is mercury poisoning not a problem in countries like Japan, where fish constitutes a large portion of the diet?
gpt
There has never been a case of mercury poisoning form food in the U.S.  The Minimata Disease was caused by amazing levels of mercury in bay fish because of a paper pulp factory.  People claiming the danger of mercury in fish in this country are greatly, greatly exaggerating the issue.  While it is advised not to eat large fish too often, no case of true poisoning has been found to date.  Elevated levels of mercury do not mean you are poisoned, you have to exhibit symptoms.  It just hasn't happened.