Category Archives: Science and Society

Studies show – or do they?


This article from The Spud – Sentences that start with “studies show” usually followed by bullshit, study shows really resonates with me. I have had a gutsful of terms like “studies show” or “scientists have found,” etc. They are simply used to give authority to all sorts of claims – but authority requires the reader to do a bit of work. Check out these studies. Find out exactly what they do say. Don’t take such claims at face value.

A recent study in the Journal of Studying Studies, concluded that sentences which start with “studies show” tend to be followed by inaccurate information.“We looked at several health news stories, anti-vaccine websites, pseudoscience pages which cover things like homeopathy and naturopathic medicine, and found that in almost all cases when a story or headline begins with “studies show” it usually meant the studies were very poor and the author didn’t fully understand the evidence they were presenting,” said researcher Dr. Ernest Young.In response to this latest news, Natural News founder Mike Adams replied with “Studies show that almost all of the studies going against natural medicine are funded by big pharma and all part of the global conspiracy perpetuated by the Illuminati and Agenda 21. I know how to juggle.”The report will be available in next months issue.

Source: Sentences that start with “studies show” usually followed by bullshit, study shows – The Spudd

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Should we trust science? – Wellington talk


Naomi Oreskes is Professor of the History of Science and Affiliated Professor of Earth and Planetary Sciences at Harvard University, and an internationally renowned geologist, science historian, and author.

If you are in Wellington next Tuesday this should be an interesting talk. I would certainly be in the audience if I was able.

Should we trust science?

Perspectives from the history and philosophy of science

Naomi Oreskes

Professor of History of Science at Harvard University.

6pm Tuesday 24 November 2015
Paramount Theatre, 25 Courtenay Place, Wellington

In this talk Professor Naomi Oreskes offers perspectives from the history and philosophy of science, argues that we should trust science and explains why.

Many readers will know Professor Oreskes as one of the authors, together with Eric M. Conway, of 
Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming
I highly recommend this excellent book.

These two authors have also written a science-based book of fiction The Collapse of Western Civilization: A View from the Future. I haven’t read it yet, but it’s certainly on my list (and in my eReader).

The Royal Society of NZ has organised the event – for more information see Should we trust science? « At Six « Events « Royal Society of New Zealand.

For those of us who can’t make Professor Oreskes talk there is a video of a similar talk she gave at Virginia Tech recently at Distinguished Lecture 2015: Dr. Naomi Oreskes, Harvard University

About Naomi Oreskes

Naomi Oreskes is Professor of the History of Science and Affiliated Professor of Earth and Planetary Sciences at Harvard University, and an internationally renowned geologist, science historian, and author.

Oreskes is the author of many scholarly and popular books and articles on the history of earth and environmental science. She has lectured widely and won numerous prizes, including the 2009 Francis Bacon Medal for outstanding scholarship in the history of science and technology, the 2011 Climate Change Communicator of the Year, and the 2014 American Geophysical Union Presidential Citation for Science and Society.

For the past decade, Oreskes has been primarily interested in the science and politics of anthropogenic climate change. Her 2010 book, Merchants of Doubt, How a Handful of Scientists Obscured the Truth on Issues from Tobacco to Global Warming, co-authored with Erik M. Conway, was shortlisted for the Los Angeles Times Book Prize and won the Watson-Davis Prize from the History of Science Society. The film version was released in late 2014.

Oreskes’s current research projects include completion of a scholarly book on the history of Cold War oceanography.

Naomi Oreskes is brought to New Zealand by History of Science 2015 conference in partnership with the Royal Society of New Zealand.

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Anti-fluoride hypothyroidism paper slammed yet again


Credit: Display of Statistical Data

Anti-fluoride campaigners often cite a limited number of papers published in scientific journals as evidence for their claims that community water fluoridation (CWF) is harmful. They do this to give some sort of scientific credibility to their claims – but the citations are far from scientific as they are usually cherry-picked, misrepresent the cited papers or use poor quality papers which are often not peer-reviewed, or poorly peer-reviewed, and written by fellow anti-fluoride campaigners.

This year, anti-fluoride campaigners have heavily promoted two such papers claiming harmful effects of CWF:

The hypothyroidism paper (Peckham et al., 2015) received negative reviews immediately after publication and a number of peer-reviewed responses have since been published. The latest response by Foley (2015) is useful because it gives a thorough critique of several faults in the Peckham paper. It is available in full text on-line:

Foley, M. (2015). Fluoridation and hypothyroidism – a commentary on Peckham et al. British Dental Journal, 219(9), 429–431.

Here is a summary of some of the points covered by Foley:

Confounding effects almost ignored

The sort of statistical analysis of data used in the Peckham et al., paper should always consider confounding effects – otherwise the analysis is simply an exercise in confirmation bias.  Foley says:

“Peckham et al. show little understanding of confounding factors, and have made only a token attempt at considering their impact. The authors mention the ecological fallacy, but then ignore its implications in strongly implying a causal link between water fluoridation and hypothyroidism.”

The confounding factor that sticks out like a sore thumb is iodine – or its deficiency. Iodine deficiency is associated with hypothyroidism and there are moderately to severely deficient levels of iodine across the UK. Foley points out:

“Vanderpump et al. have already shown that schoolgirls in fluoridated Birmingham appear to be more likely to show moderate-to-severe iodine deficiency than schoolgirls in many non-fluoridated UK cities . .”


Credit: Mu-Peter

Iodine intake could potentially be associated with fluoridation status, yet Peckham et al. discounted its effects claiming “it is unlikely that there are significant differences [in dietary iodine intake] between people, living in fluoridated and non-fluoridated areas.” That is just not good enough and simply confirms the bias of the authors – especially as they had already referenced a study showing “greatly differing urinary iodine levels in groups of schoolgirls from major UK cities, with 17% of participants showing moderate to severe deficiency.”

As Foley points out:

“. . iodine intake is associated with the outcome variable, hypothyroidism. Iodine intake could certainly confound any statistical association between fluoridation status and hypothyroidism. So why wasn’t this considered by the authors? Authors also failed to consider the impacts of smoking, medications and other factors known to contribute to hypothyroidism.”

Ignoring or downplaying confounding effects is a common trick used by those who have a bias against CWF. I referred to this in my articles Connett misrepresents the fluoride and IQ data yet again, and Connett & Hirzy do a shonky risk assessment for fluoride. Connett uses data showing a correlation of IQ with urinary fluoride explaining only 3% of the variation in IQ. The statistical  analysis did not consider confounding effects which could easily have eliminated the correlation with fluoride.

Another example is the ADHD paper of Malin & Till where a significant correlation with CWF disappeared when confounding effects were included in the statistical analysis (see  ADHD linked to elevation not fluoridationADHD link to fluoridation claim undermined again).

Poor review and citation

Authors inevitably show some bias in the citations they select, but anti-fluoridation proponents carry this to the extreme. Citations are cherry-picked to support their case and the rest of the literature usually ignored (or ridiculed) to give the impression there is a large amount of scientific support for their case.

Foley criticises the Peckham paper for this sort of citation – and for “inappropriate self-citation.”


Credit: Self-citations, is it worth to work on them?

Peckham et al., demonstrates how to use self-citation as a way of getting claims from a poor journal into a  mainstream journal. Foley mentions their self-citation of a earlier paper opposing CWF – Peckham & Awofeso (2014), Water Fluoridation: A Critical Review of the Physiological Effects of Ingested Fluoride as a Public Health Intervention, The Scientific World Journal Volume 2014 (2014):

Scientific World Journal has a well-publicised history of colluding with other journals to self-cite authors’ papers to increase journal impact factors. The referenced Peckham and Awofeso paper is unusual in that many unattributed paragraphs, including factual errors, are almost identical to paragraphs from a previous Awofeso paper. This paper in turn has unattributed paragraphs almost identical to paragraphs on webpages belonging to the National Institute of Dental and Craniofacial Research and a popular chemistry website.

I discussed this journal and Peckham & Awofeso (2014) in my article Peer review, shonky journals and misrepresenting fluoride science.

So, get a biased article published in a shonky journal (usually by paying publication fees to avoid proper peer-review) and then cite it in later papers to give dubious credibility to current claims.

But again and again Peckham et al., (2015) cites papers which don’t really support the claims they make. For example, they cite Feltman & Kosel to support their statement that “the effects of fluoride on the thyroid have long been observed.”

“But Feltman and Kosel’s only mention of the thyroid is a single sentence that other researchers ‘…report that fluoride is a thyroid inhibitor’. Their only references for this statement are a personal communication with US Public Health Service researcher Floyd De Eds, and a 1954 paper that studied delayed tooth eruption in rats following removal of the pituitary gland. The evidence supporting Peckham et al.’s statement is extremely weak.”

Similarly, Peckham et al referenced a 1958 Galletti and Joyet paper to claim fluoride reduced thyroid activity:

“However, Galletti and Joyet only investigated the effect of fluorides on patients with hyperthyroidism, and did not find that fluoride was linked to goitre. . . . . Regarding the reduction in thyroid activity in patients with hyperthyroidism treated with fluoride, Galletti and Joyet concluded ‘…such an action appears only occasionally among persons subjected to massive doses of this substance’, a situation clearly not comparable to community water fluoridation.”

Peckham et al., concluded there are “questions about the safety of community fluoridation and consideration should be given to reducing all sources of fluoride in the environment.” But Foley points out:

“Three references are given to support this statement; however, two of the references provided make no such alarmist recommendation. The only one of the three that does so is Peckham’s own 2014 paper.”

Poor conclusions

Foley’s opinion is that “the paper’s conclusions can and should be dismissed” as it has “serious biases and flaws.”

He says:

“Literature reviews have been highly selective and critical analysis of that literature has been poor. The authors show a disturbing tendency to focus on a small number of poor quality studies that reinforce their own views, while ignoring contradictory evidence from much stronger studies and reviews.”

And provides a bit of advice:

“Peckham et al. should have heeded the adage ‘correlation is not causation’ before coming to a conclusion at odds with a large body of reputable evidence from around the world.”


Credit: xkcd – correlation

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Cyberchondria and similar “illnesses”

Came across this new word today and realised immediately what it means.


What I need now is a word for a troll who makes claims to all sorts of personal illnesses and symptoms (not professionally diagnosed of course) which are highly exaggerated or invented.

Onehunga and the “fluoride-free” myth

Onehunga Aquifer optimised

An aerial view of the Onehunga Water Treatment Plant

Recently I discussed the fluoridation issue with a self-diagnosed sufferer from fluoride sensitivity. He claimed to have irritable bowel syndrome (IBS) brought on by fluoride in drinking water. His doctor didn’t believe him but he knew better – every time he left his hometown (which is unfluoridated) for fluoridated areas his IBS returned. He assured me that the water in his city is “fluoride-free.”

I checked the published data for his city and found the natural levels of fluoride in the tap water is 0.4 ppm – not too much less than the recommended 0.7 ppm where community water fluoridation is used. He didn’t respond to my comment passing on this information – maybe it brought on an attack of IBS as stress is one of the known factors causing this.

This issue came up again at a recent Auckland City Council meeting which considered a request for fluoridation of the Onehunga water supply. Unlike most of Auckland Onehunga’s water is pumped from the Onehunga springs and is not fluoridated. In fact, a referendum in 2001 voted against a proposal to fluoridate.

But what struck me is the argument presented by one councillor that some resident of Onehunga moved there because the water is “fluoride-free” and it would violate their rights if the water supply is now fluoridated. That seems a very poor argument as anyone with a hangup about fluoride can buy and use a cheap water filter – far cheaper than shifting house. But the claim that Onehunga’s water is “fluoride-free” motivated me to check out the published data for fluoride in the Onehunga water.

This graph summarises the data from reports covering the years 2010 – 2014 (a single report covered 2011-2012):

So, Onehunga water is not “fluoride-free.” The average concentration is about 0.2 ppm (not too unusual for ground-water sources in New Zealand) but the actual concentrations can vary a lot. Customers would have occasionally been drinking water with a concentration as high as 0.9 or 1.1 ppm F during that time period.

Surely this would occasionally send any fluoride sensitive person into a bout of IBS, skin rash, or one of the myriads of other symptoms propagandists against community water fluoridation claim. Or perhaps only if they had been told about the high concentrations (see Fluoride sensitivity – all in the mind?).

Fluorine is the 13th most common element in the earth’s crust so it is inevitable that our food and drink contain traces derived from natural sources. In the real world, there is no such thing as “fluoride-free.”

Note: I don’t know if such variation is common with underground freshwater sources. The Onehunga aquifer  derives from rainwater soaking through lava flows around One Tree Hill. It could well be prone influences from historical industrial or other sources in the locality. Apparently it has high nitrogen levels and may also be influenced by broken sewer pipes.


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Thames voters decisively support fluoridation

Fluoride Referendum Web Page Banner-01

Voters in the Thames water supply area of service have resoundingly defeated attempts to stop fluoridation of their water supply.

The Thames-Coromandel District Council has released the result of a referendum  which had been imposed on the town because of activities of anti-fluoridation campaigners. The results show a resounding defeat for these campaigners with 73% of voters supporting retention of community water fluoridation.

This is a decisive result, made even more decisive by the high turnout in the postal vote – almost 57 %. This is an unusually high turnout for local body votes in New Zealand.

Anti-fluoride campaigners were very active during this referendum, publishing about six full-page advertorials in the local papers as well as having a strong presence on the streets. It appears this aggressive approach could have turned residents off, even encouraged them to vote.

In fact, the advertising and billboard claims of the anti-fluoride campaigners have been the subject of several complaints to the Advertising Standards Authority (ASA). The Authority released the first decision on these complaints today finding that anti-fluoride advertising had violated advertising ethics. There will be more decisions released by ASA in the coming days and weeks.

The council had decided this would be a binding vote so approval of the decision to continue fluoridation is just a formality.

See also: Thames-Coromandel District Council – Thames voters opt to continue fluoridation of town water supply

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Scientific papers, civil disobedience and personal networks


Image credit: 4 tips on finding and reading scientific papers…

Jerry Coyne raises an important issue about science publishing on his blog, Why Evolution is True. That is the problem of most published scientific journals being behind a firewall and so inaccessible to readers who do not have an institutional subscription – unless they pay an exorbitant fee – US$30 or more per paper.

His article, Scientists engage in civil disobedience, share copyrighted papers, is aimed mainly at scientists, but the problems is probably greater for the non-scientist, as most working scientists already have institutional subscriptions and libraries which can source papers where there is no subscription.

Incidentally, this is also a big problem for the retired scientist. Since the advent of Human Resources Departments, one loses all privileges and accesses on retirement. Cards and pin numbers for access to buildings no longer work. Emails addresses are lost. And access to institutional networks, databases, libraries and journal subscriptions also disappear.

It is particularly a problem for people who wish to discuss scientific evidence online – whether they have a scientific background or not. Firewalls often mean that discussion is hindered because people rely only on abstracts (and sometimes only titles!). Sure, we are all familiar with trolls who will make confident assertions on even less evidence – but they are dishonest. I strongly believe that participants in these discussions have a responsibility to at least read the papers they cite.

So, it is frustrating to post a blog article about a new paper knowing that many readers simply don’t have access to more than the abstract. Providing a link to a copy of these papers violates copyright and there are limits to the amount of text that can be quoted in a blog post.

So what is a reader to do? I wouldn’t recommend paying exorbitant fees for a paper which may or may not be useful – and that only encourages science publishers in a practice which is little more than  blackmail or piracy.

Here are two suggestions – first the “civil disobedience” described by Jerry Coyne, which is most probably illegal because of copyright violations. Secondly, one that is far more legal and better for one’s conscience.

Sharing copyrighted papers by civil disobedience.

i-can-haz-pdf-memeJerry describes a method using the hashtag  #icanhazpdf on Twitter. The procedure is described in the Atlantic article, How to Get Free Access to Academic Papers on Twitter. Have a read – but I find it impersonal and a bit sneaky (it involves deleting one’s tweet once a paper is downloaded and there is no real contact with the person who made the paper available). However, it will appeal to some people attracted to the idea of civil disobedience and “putting it to the man.”

This method is also discussed in the articles The scientists encouraging online piracy with a secret codeword and I can haz PDF: Academics tweet secret code word to get expensive research papers for free.

Using personal and online networks

One could always try a public library for a personal inter-loan – but that hardly appeals to the modern person who desires more immediate access.

I have found using Google Scholar to search for a title will often produce a link to a pdf copy already online, maybe already in violation of copyright. It’s amazing how many papers used by anti-fluoride activists are available from links on anti-fluoride web pages.

And, in the old days we used to request reprints from authors. Why not give that a go – send an email to the corresponding author asking if they could send you a pdf.

But what about considering your own personal and online networks.

Do you have a family member, friend or even an acquaintance (or several) who works in a scientific institution? It wouldn’t hurt to politely ask if they could get a pdf of the paper you are after and send it to you. Surely it is legally OK for staff in such institutes to discuss their work, and other aspects of science, with interested people via email. I can’t see that such communications, sometimes involving attached scientific papers, violate copyright – at least in spirit.

Then there are the online networks we seem to have these days – usually via Facebook groups. Most scientists would be cagey about attaching a link to a Facebook comment but sending a pdf via personal message or email would be OK. If you don’t already belong to a science or sceptical group then this is a good reason for joining. There will be people in these groups willing to help – and if the group is a closed one there is little risk.

Perhaps join several groups – after all if you have several people or networks to call on you will feel less guilty about asking others to spend time on your request.

Finally, it is not enough to acquire these pdfs – one should always read them before discussing them. And I mean read them critically and intelligently. This infographic gives you an idea of what can be involved.


Credit: Natalia Rodrigue –  Infographic: How to read a scientific paper

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The quackery of anti-fluoride internet trolls

pe-health-and-fitness-quackery-3-638The article How Quackery Sells from Quackwatch is ten years old but it still very relevant. Perhaps even more relevant than it used to be because of the increase in internet coverage. This has widened the possibilities for snake oil salespersons. But it has also widened the possibilities for propagandists who may not be selling something themselves but are promoting the ideologies that the snake oil salespeople rely on.

It is the last form of quackery that concerns me. I am one of the last persons to be attracted to “natural”/alternative health products and treatments. But I certainly have to battle the “natural”/alternative health propagandists in the comments section of this blog and elsewhere on the internet.

How Quackery Sells describes the ways quacks fool their customers and patients. But it is amazing that these same methods seem to come just as naturally to the internet commenter or troll who devotes so much time to attacking bloggers who promote or defend science. This could describe the troll:

“Modern health quacks are supersalesmen. They play on fear. They cater to hope. And once they have you, they’ll keep you coming back for more . . . and more . . . and more.”

“Most people think that quackery is easy to spot. Often it is not. Its promoters wear the cloak of science. They use scientific terms and quote (or misquote) scientific references.”

And these are methods common to quacks and trolls promoting quackery.

troll 6

Appeals to vanity

“A subtle appeal to your vanity underlies the message of the TV ad quack: Do it yourself—be your own doctor.”

Yes – and that is a common message of these internet trolls. Be your own doctor – don’t trust the professional!

Turning customers into salespeople

“Most people who think they have been helped by an unorthodox method enjoy sharing their success stories with their friends.”

And how many trolls have told us about their bad experiences with community water fluoridation (CWF)? All the aches and pains, irritable bowel syndrome, etc., that go away when they stop drinking fluoridated water – and reappear when they accidentally do drink it! They pretend to speak from authority even though it is “difficult to evaluate a “health” product on the basis of personal experience.”

Trouble is:

“Since we tend to believe what others tell us of personal experiences, testimonials can be powerful persuaders. Despite their unreliability, they are the cornerstone of the quack’s success.”

Perhaps that is why the anti-fluoride troll relies on such personal claims. Polite people are afraid to doubt them – yet when asked for specifics b y rude people like me they often run away.

The use of fear

The article says about this:

“Quackery’s most serious form of fear-mongering has been its attack on water fluoridation. Although fluoridation’s safety is established beyond scientific doubt, well-planned scare campaigns have persuaded thousands of communities not to adjust the fluoride content of their water to prevent cavities. Millions of innocent children have suffered as a result.”

Clinical tricks

“The most important characteristic to which the success of quacks can be attributed is probably their ability to exude confidence. Even when they admit that a method is unproven, they can attempt to minimize this by mentioning how difficult and expensive it is to get something proven to the satisfaction of the FDA these days. If they exude self-confidence and enthusiasm, it is likely to be contagious and spread to patients and their loved ones.”

Or, in the case of anti-fluoride campaigners, spread to local body politicians when these self-declared “experts” make submissions full of misinformation and distortion of the scientific articles they cite.

“Another potent technique is cultural association, in which promoters ally themselves with religious or other cultural beliefs by associating their product or service with an article of faith or prejudice of their target audience.”

Anti-fluoride campaigners are past masters at taking advantage of widespread concern for the environment, desire to support and return to nature and the sensible fear of contamination.

Handling the opposition

“Quacks are involved in a constant struggle with legitimate health care providers, mainstream scientists, government regulatory agencies and consumer protection groups. Despite the strength of this science-based opposition, quackery manages to flourish. To maintain their credibility, quacks use a variety of clever propaganda ploys.”

“They persecuted Galileo!” – “Today’s quack boldly asserts that he is another example of someone ahead of his time.”

The charge of “conspiracy.” “How can we be sure that the AMA, the FDA, the American Cancer Society, drug companies and others are not involved in some monstrous plot to withhold a cancer cure from the public?”

Anti-fluoride campaigners continually resort to conspiracy to explain the near unanimous support of health authorities for CWF.

“Claims of “suppression” are used to market publications as well as treatments. Many authors and publishers purport to offer information that your doctor, the AMA, and/or government agencies “don’t want you to know about.””

So often the troll claims that their doctor refuses to recognise the symptoms they claim CWF cause. And as far as the scientific and science publication establishment is concerned – of course they suppress any data supporting the anti-fluoride claims.

“Another diversionary tactic is to charge that quackery’s critics are biased or have been bought off by drug companies.”

“Shill” must be the most common term of abuse used by the anti-fluoride troll against anyone attempting to communicate the science behind CWF.

“Quacks like to charge that, “Science doesn’t have all the answers.” That’s true, but it doesn’t claim to have them. Rather, it is a rational and responsible process that can answer many questions—including whether procedures are safe and effective for their intended purpose. It is quackery that constantly claims to have answers for incurable diseases. The idea that people should turn to quack remedies when frustrated by science’s inability to control a disease is irrational. Science may not have all the answers, but quackery has no answers at all! It will take your money and break your heart.”

That seems obvious to me but how often do we get trolls effectively rejecting, or disparaging, science as a way of understanding reality? How often do the “failures” and mistakes of science – usually more imaginary than real – get trundled out. Anti-fluoride campaigners seem unable to understand that recognition of the problems due to smoking, lead in petrol or prescription of thalidomide to pregnant women are an argument for science, not an argument to ignore science.

How to Avoid Being Tricked

“The best way to avoid being tricked is to stay away from tricksters. Unfortunately, in health matters, this is no simple task.”

“Sad to say, in most contests between quacks and ordinary people, the quacks still are likely to win.”

Well, I guess health experts and scientifically informed sceptics are not fooled. Trouble is, when the information peddled by trolls is presented unchallenged to local body politicians or decision makers these “ordinary people” are often fooled.

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Our beautiful planet: Astronaut art works

Sahara-1 small

This photo is a real work of art – the sort of thing I would love to have displayed on my wall.

But there is plenty where that came from. It is one of the photo’s taken by astronaut Scott Kelly from the International Space Station. He lifted off from Kazakhstan on March 27 and is scheduled to return to Earth on March 3, 2016, after spending a total of 522 days in space, according to NASA (this is his 4th mission).

Scott Kelly

Scott Kelly aboard the ISS

The photos here are from a series Scott took of the Sahara desert. Really beautiful works of art.

Shara-5 small Sahar-4 small Sahara-3 small Sahara-2 small

These photos are from: Earth Art: NASA ‘artist’ stuns Twitter with Sahara Desert pics taken from space (PHOTOS) — RT News

Follow Scott Kelly on Twitter (@StationCDRKellyfor more of his brilliant photography from space.

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Combatting anti-fluoride Gish gallopers

gishWe have all experienced this problem. Claims made on the internet which rely on nothing more than constant assertion – and moving on, when challenged, to new claims, similarly relying only on assertion. The old Gish gallop.

truth boots

The conscientious defender of science is often loaded down with the task of checking out claims, finding the literature – and reading it to find what it actually says. So it is useful, when there is a debate on a specific subject, to have access to a source where all the claims are considered together.

Community water fluoridation is one subject where all sorts of weird and wonderful (and unscientific) claims are peddled. Now we have a document which critically analyses many of these claims in one place. What’s more – it is in a peer-reviewed publication. And it is local – dealing with common claims made by anti-fluoridation campaigners in New Zealand.

The paper is:

Broadbent, J., Wills, R., McMillan, J., Drummond, B., & Whyman, R. (2015). Evaluation of evidence behind some recent claims against community water fluoridation in New Zealand. Journal of the Royal Society of New Zealand, 6758(October), 1–18.

Unfortunately, it is behind a pay wall – but many readers may have institutional access – or know someone who has.

I am not going to go through the whole paper here – nor present the analysis of each claim ( I have already done this for many common anti-fluoride claims – interested readers can do a topic search here, or browse the fluoridation list of articles). Instead, I list below all the claims considered in the paper below

Chemistry of fluoride

Claim: ‘[F]luorine is an inherently toxic element’ (Gross 1956; Atkin 2013).

Claim: ‘Fluorine naturally presents as calcium fluoride in water supplies’ (Guha 2011; Atkin 2013).

Claim: ‘Water fluoridation systems use either hydrofluorosilicic acid or derivative hexafluorosilicate. These compounds have never been tested for human health safety’ (Waugh 2012; Atkin 2013).

Claim: ‘Silicofluorides do not fully dissociate to form free fluoride ions in aqueous solution and revert to the silicofluoride ion in acid stomach conditions’ (Atkin 2013; Sauerheber 2013).

Claim: ‘Silicofluorides do not completely dissociate to form free fluoride ions, as proved by Crosby (1969)’ (Royal 2010).

Claim: ‘The World Health Organization states that 40% of ingested fluoride is absorbed through the stomach wall as molecular hydrofluoric acid (a known mutagen). This negates the “all fluoride ions are the same” deception’ (Atkin 2013).

Health and safety

Claim: ‘In 2000, the US National Sanitation Foundation released test results showing fluoridation chemicals typically add 0.43 parts per billion (ppb) arsenic to the finished water’ (Connett 2001; Atkin 2013; Hirzy et al. 2013).

Claim: ‘Adjusting for NZ parameters, applying the EPA’s risk factor (3.5 × 10–5 deaths per 70 year lifetime per microgram arsenic per day), we would expect 1.1 extra lung and bladder cancer deaths per year in NZ due to the contaminated fluoridation chemicals used’ (Atkin 2013).

Claim: ‘A report by environmental risk consultant, Declan Waugh, showed that across all major health conditions, the 70%-fluoridated Republic of Ireland had significantly higher disease rates than never-fluoridated Northern Ireland, often by several 100%’ (Atkin 2013; Waugh 2013).

Claim: ‘The recent Harvard review of IQ studies found that there was a genuine concern about developmental neurotoxicity’ (Atkin 2013).

Claim: ‘In the US court case of Aitkenhead v Borough of West View it was found proven that fluoridation increased cancer rates by 5%. This finding has never been  overturned’ (Atkin 2013).

Claim: ‘In 2006, Dr Elise Bassin published high quality research showing that boys (but not girls) exposed to fluoridated water between the ages of 5 and 10 had 500% more osteosarcoma in their teens (Bassin et al. 2006). No study has ever refuted Bassin’s findings, as they look at total lifetime exposure or exposure at time of diagnosis, both of which are irrelevant. This equates to two osteosarcoma deaths per year in New Zealand (NZ)’ (Atkin 2013).

Claim: ‘In 2006 Dr Elise Bassin published research in Cancer Causes and Control, demonstrating that it is likely that males exposed to fluoride, including fluoridated water, between the ages of 6 and 8 years inclusive, had at least a five-fold increased risk in developing osteosarcoma (bone cancer) in their teens’ (Atkin 2011).

Claim: ‘A range of studies, using different modalities, has shown a correlation between fluoride and heart disease’ (Takamori et al. 1956; Singh et al. 1961; Atkin 2013).

Claim: ‘[A] direct correlation [exists] between the fluoride level in arteries, including coronary arteries, and atherosclerosis’ (Li et al. 2012; Atkin 2013).

Claim: ‘Perhaps one of the most alarming potential consequences of water fluoridation, as highlighted in recent research, is that a significant correlation exists between fluoride uptake and calcification of the major arteries, including coronary arteries’ (Li et al. 2012; Waugh 2012).

Claim: ‘Following fluoridation’s introduction into the US, deaths from heart attacks sky-rocketed in the fluoridated communities, compared with non-fluoridated ones’ (Miller 1952; Atkin 2013).

Claim: ‘Between 1% and 3% of the population have a chemical intolerance to fluoride. This manifests in a range of conditions, including gastrointestinal problems and debilitating chronic fatigue’ (Feltman & Kosel 1961; Moolenberg 1987; Atkin 2013).

Claim: ‘In one study, which lasted 13 years, Feltman & Kosel (1961) showed that about 1% of patients given 1 mg of fluoride each day developed negative reactions, (Connett 2012).

Claim: ‘Research by the State University of New York in 2009 showed women in fluoridated communities had a 15% higher incidence of preterm births, and that this rate was greater for poor non-white mothers. Further research also shows higher preterm birth rates and lower birth weights connected with fluoride (Susheela et al. 2010). Based on NZ statistics, we would expect at least 3.3 extra neonatal deaths per year just from extra extreme preterm births caused by fluoridation, disproportionately affecting Maori and Pacific’ (Atkin 2013).

Claim: ‘Those whom fluoridation is claimed to most benefit, poor non-whites, not only receive little if any such benefit, as found by the York Review, but are most at risk from fluoride’s toxicity’ (Atkin 2013).

Research and mechanisms

Claim:‘The biggest reason [for reduction of dental caries] in New Zealand is that the Ministry of Health directed school dental nurses to stop filling teeth unnecessarily. They stopped filling tiny surface enamel defects during the Hastings experiment, producing an overnight 25% reduction in ‘decay’, attributed to fluoridation in the report (Colquhoun & Mann 1986). In 1976, they stopped drilling and filling perfectly healthy molars—a 64% reduction over five years’ (de Liefde 1998; Atkin 2013).

Claim: ‘The claimed reductions in decay [in the Hastings fluoridation trial], which were greatest for the younger children, were brought about partly if not mainly by a local change in diagnostic procedure following introduction of fluoridation’ (Colquhoun & Mann 1986).

Claim: ‘The original belief was that fluoride had to be ingested to harden teeth during enamel formation. This was discredited in 1999 (Featherstone 1999). Any significant effect from fluoride is topical, not systemic, through high fluoride concentrations (such as toothpaste), not through fluoridated water washing over the teeth during the day’ (Atkin 2013).

Note: Many of the claims considered are sourced from an article by Mark Atkins – formerly the “science and legal advisor” for Fluoride Free NZ. That article is:

Atkin, G. M. (2013). New Zealand drinking water should be fluoridated: No. Journal of Primary Healthcare, 5(4), 332–334.

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