I honestly don’t know enough about the theories to dismiss or validate them offhand, but the article quotes an official as saying that it seems as though the primary issue is that things like ceramic cookware and other household items had more lead in them than initially believed:
> Fuller said part of this "missing piece of the puzzle" was revealed in a Pure Earth report released on Tuesday, which analyzed 5,000 samples of consumer goods and food in 25 developing countries.
>It found high rates of lead contamination in metal pots and pans, ceramic cookware, paint, cosmetics and toys.
>"This is why poorer countries have so much lead poisoning," Fuller said. "It's items in the kitchen that are poisoning them."
> Fuller said part of this "missing piece of the puzzle" was revealed in a Pure Earth report released on Tuesday, which analyzed 5,000 samples of consumer goods and food in 25 developing countries.
>It found high rates of lead contamination in metal pots and pans, ceramic cookware, paint, cosmetics and toys.
>"This is why poorer countries have so much lead poisoning," Fuller said. "It's items in the kitchen that are poisoning them."