To people replying to the guy with snaky comments - you THINK you know because somebody ( media, school) taught you, correct? That's being being a parrot, not a thinker/investigator.
Of course you are welcome to give him the benifit of doubt and try to engage with him in good faith. I sincerely doubt it will lead anywhere, many have tried before you with no productive results.
Normally, you would try to falsify the existing theory, but, that is not an option, since it never existed - the proponents came with the claim that it had always been known and insisted relentlessly. It has subtle, nondescript symptoms, the only clear sign of the poisoning is its presence in the blood. There are some other measurable chamges, but that would only get stuck on me claiming that it proves its essentiality, vs you claiming that it proves the poisoning. All the evidence like the presence in bones, 250kyo neanderthal teeth, phosphates, coal and so on has supposedly been somehow proven irrelevant. The lack of improved health and intellect, rather the increasingly undeniable presence of the inverse is being ignored. It's essentially unfalsifiable.
Right on cue.
"Lead’s toxicity was recognized and recorded as early as 2000 BC and the widespread use of lead has been a cause of endemic chronic plumbism in several societies throughout history. The Greek philosopher Nikander of Colophon in 250 BC reported on the colic and anemia resulting from lead poisoning. Hippocrates related gout to the food and wine, though the association between gout and lead poisoning was not recognized during this period ( 450-380 BC). Later during the Roman period, gout was prevalent among the upper classes of Roman society and is believed to be a result of the enormous lead intake."
https://www.biologicaldiversity.org/campaigns/get_the_lead_o...
Does he/she huff asbestos for health, too?
Look, why do we suffer from all those intractable "lifestyle diseases", need glasses and in general are the most unhealthy population in recorded history, and why is everything falling apart? People are literally insane, its toxicity is the lie.