さあ！諸君！捕鯨問題だ！

http://www.ncbi.nlm.nih.gov/pubmed/18722469

．．．The potential for methylmercury to interact with other chemicals present in marine food, particularly PCBs, has been explored in both animal models and human studies. Results may be both exposure- and endpoint-dependent. The Seychelles Islands study has explored the potential for the social environment to modify the effects of developmental methylmercury exposure. An understanding of the interactions of the multiple factors that determine the final behavioral outcome of exposure to methylmercury is crucial to risk assessment and risk management decisions.

セイシェルでは「社会的環境」が焦点になってますね。
いずれにしても、調査、研究は現在進行中です。