Most of the ancients that people pay attention to these days are ... well-fed
You mean well-fed in the sense of "not starving," but that doesn't imply "well-fed" in the sense of eating a healthy diet. There's reason to think that upper-class Romans would have been even more damaged by lead poisoning than the poor, and there's good evidence that even emperors were deficient in iodine.
I have a historian standing next to me right now who says the lead poisoning story is BS and people who propagate it should be shot/severely eye-rolled at. He says that:
-Romans did drink lead-sweetened wine but
-only lower class romans did so because they could not afford better
-lead-sweetened wine continued to be drunk up until the 18th century
-While some people undoubtedly died, saying it caused the fall of the Roman Empire is a ridiculous just-so story
-particularly because the sweetener was used centuries before and after the fall with no increasing usage leading up to the fall
-and the eastern Roman empire continued to exist for another thousand years anyway.
Rationality quotes time!
The usual rules: