Comment by jiggawatts
20 days ago
The relationship appears to be linear down to zero, but it’s very hard to study near those levels. From what I’ve seen, the best current science is that the fluoridation levels in typical western countries are reducing average IQ by about 0.5-1.5 points.
For reference, adding lead to fuel was far, far worse.
Any citations?
I suspect it is hard to control for confounding correlations - specifically I would guess it is more likely that poorer areas are flouridated. HV electric power lines and nuclear stations have the issue that poorer people are more likely to live next to those, and poorer people have have worse health outcomes so it falsely appears that both of those cause the health problems.