●古代の人々が「鉛やカドミウムなどの重金属で汚染された海産物」を食べていたことが残飯の骨から判明(GIGAZINE)
　https://gigazine.net/news/20200220-neolithic-seafood-dangerous-heavy-metals/

●古代人が食べた魚から検出された「水銀やカドミウム」の謎(FORBES)
　https://forbesjapan.com/articles/detail/32765

●The Real 'Paleo Diet' Contained Some Pretty Toxic Heavy Metals, Study Reveals (SCIENCE alert)
　https://www.sciencealert.com/want-to-eat-real-palaeo-you-might-need-to-increase-your-toxic-metals
　Dangerous food. Climate change induced elevated heavy metal levels in Younger Stone Age seafood in northern Norway (SCIENCE Direct)
　https://www.sciencedirect.com/science/article/abs/pii/S1040618220300203