A group of well-known anti-fluoride activists have just published some new research. Well, this is what their social media publicity will tell us.
In fact, this is not new research. It is simply the republication of a shonky paper from two years ago as a chapter in a book produced by a predatory open access publisher.
It is a clear example of anti-fluoride activists attempting to buy scientific credibility. This book chapter cost them GBP £1400!
The “new” paper, or book chapter, anti-fluoride people will be promoting is this:
Hirzy, J. W., Connett, P., Xiang, Q., Spittle, B., & Kennedy, D. (2018). Developmental Neurotoxicity of Fluoride: A Quantitative Risk Analysis Toward Establishing a Safe Dose for Children. In J. E. McDuffie (Ed.), Neurotoxins (pp. 115–131). Rijeka: InTech.
In fact, this is simply a slight rehash of the paper published 2 years ago:
Hirzy, J. W., Connett, P., Xiang, Q., Spittle, B. J., & Kennedy, D. C. (2016). Developmental neurotoxicity of fluoride: a quantitative risk analysis towards establishing a safe daily dose of fluoride for children. Fluoride, 49(December), 379–400.
Almost word for word. And the authors acknowledge this at the beginning of the chapter with an introductory statement:
” This work has, in slightly different format, form and content been published in the journal Fluoride, Vol. 49(4 Pt 1):379–400, December 2016.”
I guess that saves me the job of critiquing this new version – my analysis and critique of the original paper was posted as the article Debunking a “classic” fluoride-IQ paper by leading anti-fluoride propagandists. I also discussed the issues in other articles (see Connett & Hirzy do a shonky risk assessment for fluoride, Anti-fluoride authors indulge in data manipulation and statistical porkies, and Anti-fluoridation campaigners often use statistical significance to confirm bias).
I have also submitted for publication a more formal critique of the original Hirzy et al., paper – see Does drinking water fluoride influence IQ? A critique of Hirzy et al. (2016)and CRITIQUE OF A RISK ANALYSIS AIMED AT ESTABLISHING A SAFE DAILY DOSE OF FLUORIDE FOR CHILDREN.
Perhaps I will just repeat this qualification given by the authors in the first paper (and repeated in the book chapter), as it does call into question the whole campaign against community water fluoridation (CWF). They say:
“However, when comparing a fluoridated area of the USA to an unfluoridated area it would be hard to discern a mean IQ difference, because of the multiple sources of fluoride intake besides drinking water (Table 5). These sources greatly reduce the contrast in total fluoride intake between fluoridated and unfluoridated areas. A very high hurdle is thus created to gaining useful information in the USA, as it was in the New Zealand study , via a large, long-range longitudinal epidemiological study of fluoride and IQ.”
They are, in effect, accepting that no study of CWF has shown an IQ effect and argue that such studies will never show an effect. Because, they argue, there is only a small difference in fluoride dietary intake between children in fluoridated and unfluoridated areas.
The fact that studies show no effect of fluoridation on IQ drives their need to “explain away” these results using dubious estimates of dietary intake. However, they are essentially conceding there is no point campaigning against CWF. If they want to stick with their “explaining away” argument then, if anything, they should campaign against other forms of dietary intake and leave CWF alone.
Anti-fluoridationists often argue that they have science on their side – and many of them seem to honestly believe it. Of course, when one is singing to the choir it is easy to delude oneself. The facts are that most claims made by anti-fluoride activists do not stand up to scientific scrutiny and when they cite scientific reports they are usually misrepresenting them.
I just wish these campaigners would sit down and actually read the papers they keep touting – very often they just do not say what is claimed for them.
On the other hand, a small number of scientifically dubious papers do make their way into the scientific literature and these get used as “proof” by activists. Usually these are published in poor quality journals (like “Fluoride” where Hirzy et al., originally published their paper) and this is especially true when the authors are known anti-fluoride activists.
So, a combination of misrepresentation of the scientific literature and citation of poor quality papers get churned out again and again by campaigners to give scientific credibility to their arguments.
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