--- title: "The Authors Spent Four Pages Begging You Not To Use Their Result" dek: "Fifty-nine studies, pooled, showing a clear effect at high exposure. At the concentrations North American water systems actually use, the confidence interval crosses zero. The dose–response curve is the finding. The headline number is not." kind: explainer (Explainer) desk: The Body author: Loretta Sung (fictional) published: 2026-07-06T11:00:00Z url: https://theyburied.com/article/fluoride-meta-analysis tags: fluoride, meta-analysis, public health, dose, evidence genre: satire status: fiction — nothing in this story happened; every person, source and document is invented --- # The Authors Spent Four Pages Begging You Not To Use Their Result *Fifty-nine studies, pooled, showing a clear effect at high exposure. At the concentrations North American water systems actually use, the confidence interval crosses zero. The dose–response curve is the finding. The headline number is not.* The paper is real, the effect it reports is real, and almost every account of it this newspaper has read gets the same thing wrong in the same way. It reports a *dose–response relationship*. Coverage reports a *finding*. > **Figure:** The effect, by exposure band — see https://theyburied.com/article/fluoride-meta-analysis Those are not the same object and the difference is the whole story. ## What the paper did Fifty-nine studies, pooled, examining childhood exposure to fluoride against measured cognitive outcomes. The pooled effect is negative and statistically significant. That sentence is true and is where most coverage stops. ## The curve The authors then did the thing that makes the paper worth reading: they split by exposure. **Pooled effect by exposure band (as published)** Exposure band | Studies | Effect | Confidence interval Above 4.0 mg/L | 21 | clear negative | does not cross zero 2.0 – 4.0 mg/L | 17 | negative | does not cross zero 1.5 – 2.0 mg/L | 12 | small negative | narrowly excludes zero Below 1.5 mg/L | 9 | very small negative | **crosses zero** North American community water systems operate between 0.6 and 0.8 mg/L. The two municipal engineers this newspaper telephoned gave 0.7 for both of their systems and both said the target had not changed in a decade. That is in the bottom band. The bottom band is the one where the interval crosses zero — which means the pooled data cannot distinguish the effect from no effect at all. The high-exposure studies come overwhelmingly from regions with naturally high groundwater fluoride, at three to eight times the concentration any North American system adds deliberately. > The headline is a real finding about a real exposure. It is not a finding about your tap. > > — Dr. Perpétua Almeida-Nyongo ## What the authors said about their own paper Dr. Perpétua Almeida-Nyongo, the paper's second author, was asked what she wanted a general reader to take from it and answered without hesitating. "That the dose matters and that we said so in four pages of discussion which nobody reads," she said. "We were extremely careful. We wrote that the low-exposure estimate is imprecise, that eleven studies use area-level exposure which is weak, and that the confidence interval at community concentrations includes no effect. All of that is in the paper. None of it was in the coverage." Asked whether she regretted publishing it, she was sharp: "Absolutely not. High natural fluoride is a genuine public health problem for tens of millions of people and this paper is about them. It got turned into a story about somebody else." ## The critic Dr. Werner Achebe-Lindholm is not an author and thinks the meta-analysis is too permissive. His objection is specific: eleven of the fifty-nine studies classify exposure by area rather than by individual measurement, which means a child is assigned the fluoride level of their district and not of the water they drank. He thinks those eleven should have been excluded and that including them widens everything. He also said, unprompted, that he agrees with the authors about the dose–response shape and that he thinks the coverage has been worse than the paper. "I am arguing with them about inclusion criteria," he said. "That is a normal argument between epidemiologists. It is not the argument people think is happening." ## What this piece does not say It does not say fluoridation is safe. It does not say it is unsafe. It is an explainer and it takes no position, because taking a position would be an opinion and this newspaper does not print opinion on the news pages. What it says is narrower: that the paper reports an effect that scales with dose; that the dose at which the effect is clear is several times the dose used in North American water systems; that at those systems' concentrations the pooled interval includes zero; and that the paper's own authors have been saying this, in print, for longer than anyone has been quoting them. ## Sources (invented) - Dr. Perpétua Almeida-Nyongo, Epidemiologist; second author of the meta-analysis — Interviewed by video call (26 June 2026) - Dr. Werner Achebe-Lindholm, Environmental health researcher, not an author — Interviewed by telephone (29 June 2026) - Two municipal water engineers, Named in our notes — Telephone (July 2026) ## What we could not confirm - Whether the residual effect at low exposure is real. The confidence interval crosses zero and the authors say so. - The exposure classification in eleven of the fifty-nine studies, which relies on area-level rather than individual measurement. Both the authors and their critic flagged this independently. --- They Buried is a satirical newspaper. Every story, source, document and person in it is invented. It reports from a fictional world in which the conspiracy theories are true, with the method of a real daily.