Other studies have previously found that IQs of breastfed babies are 10 points higher on average than IQs of newborns fed formula milk. Could neurotoxicity of fluoride in tap water, mixed with formula, be another factor in that?
Update: arguments on Reddit point out that:
Harvard Study Finds Fluoride Lowers IQ
After reviewing fluoride toxicological data, the NRC reported in 2006, "It's apparent that fluorides have the ability to interfere with the functions of the brain."
Choi's team writes, "Fluoride readily crosses the placenta. Fluoride exposure to the developing brain, which is much more susceptible to injury caused by toxicants than is the mature brain, may possibly lead to damage of a permanent nature."
Fluoride accumulates in the body. Even low doses are harmful to babies, the thyroid, kidney patients and heavy water-drinkers. There are even doubts about fluoridation's effectiveness. New York City Legislation is pending to stop fluoridation. Many communities have already stopped.
Infant formula when mixed with fluoridated water delivers 100-200 times more fluoride than breastmilk.
- this is a press release merely being conveyed by Reuters, who disclaims responsibility for the content;
- the study is flawed because it "relies almost exclusively on Chinese studies of fluorosis in high-fluoride areas", and "Asian drinking water is often extensively contaminated with fluoride concentrations above 4 mg/L". In contrast, "civil fluoridation is optimally .6-1.2 mg/L - the high levels in the study were 2.5 to 7 times that".
It's also easy to occasionally dump enough fluoride in the water to exceed the safe values. I've had water with an obvious severe overdose of fluoride in first world cities such as Miami and Vegas.
(I have a sensitivity to fluoride, which is why I use a non-fluoride toothpaste. When there's a lot of fluoride, I notice. In these cases, the water stank of it, and I felt the same adverse effects as from fluoride toothpaste.)