Earlier quoted context omitted.
This is nonsense. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3485653/ says > There is no such level of lead that appears to be necessary or beneficial to the body and no “safe” level of exposure to lead has been found. https://www.who.int/news-room/fact-sheets/detail/lead-poison... says > There is no level of exposure to lead that is known to be without harmful effects. > The body stores lead in the teeth and bones…
It's a lie. The effects are always beneficial except in extreme doses. No dose that makes no difference is exactly what you would expect from a nutrient. Lead activates the proteins it supoosedly poisons: https://www.researchgate.net/publication/12425341_Inorganic_... Yes, teeth and bones use most of the lead that you consume. But why is there lead in the teeth of neandethals? https://www.mountsinai.org/about/newsroo…
For that matter, activating and poisoning aren't even mutually exclusive, you can run an engine too fast and burn it, work out till you get rhabdo and your P looks like T, etc.
To show it's healthy you'd need studies showing better health of exposed people, or at least some theoretical reason you'd want lead to make it even plausible.
The neanderthals probably ate stuff from lead rich soil or something, that doesn't prove it wasn't harmful. Lots of stuff is just mildly bad, it kills some people, sickens others, but not enough to affect population growth so Darwin continues not caring while people die and suffer.
Maybe they had some lead containing tools or medicines or something, of the sort we can avoid now because of safety standards.
Our ancestors were exposed to lots of unhealthy stuff, including battle axes, most of us would prefer to minimize it to below that level, and continually improve things.