Thyroid UK
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Fluoride levels in drinking water associated with hypothyroidism

Research report

My comments. Increasingly I am seeing people giving medication to children containing fluoride for strengthening teeth. Fluoride is a very stable chemical and is used as a base in a vast range of medications. it does have a downside as it was used in the past to control hyperthyroid conditions, in effect at a certain level it will shut down the action of thyroid hormones.

Consider this, your attempt at oral health may be causing you to have thyroid symptoms. We are facing an obesity epidemic in the west could this be one of the factors in this highly complex problem?

The list below is taken from the Fluoride Toxicity Research Collaborative

Anesthetics (general)

Anti-fungal antibiotics

Appetite suppressants



Arthritis (rheumatoid)


Antilipemics (cholesterol lowering)

Psychotropic (anti-psychotics)

Antibiotics (Fluoroquinolones)


Steroids/anti-inflammatory agents


Antimetabolites (chemotherapy)

Are fluoride levels in drinking water associated with hypothyroidism prevalence in England? A large observational study of GP practice data and fluoride levels in drinking water

Press Release

S Peckham, D Lowery, S Spencer

+ Author Affiliations

Centre for Health Services Studies, University of Kent, Canterbury, Kent, UK

Correspondence to

Professor Stephen Peckham, Centre for Health Services Studies, University of Kent, Canterbury, Kent CT2 7NF, UK;

Received 18 September 2014

Revised 16 January 2015

Accepted 18 January 2015

Published Online First 24 February 2015


Background While previous research has suggested that there is an association between fluoride ingestion and the incidence of hypothyroidism, few population level studies have been undertaken. In England, approximately 10% of the population live in areas with community fluoridation schemes and hypothyroidism prevalence can be assessed from general practice data. This observational study examines the association between levels of fluoride in water supplies with practice level hypothyroidism prevalence.

Methods We used a cross-sectional study design using secondary data to develop binary logistic regression models of predictive factors for hypothyroidism prevalence at practice level using 2012 data on fluoride levels in drinking water, 2012/2013 Quality and Outcomes Framework (QOF) diagnosed hypothyroidism prevalence data, 2013 General Practitioner registered patient numbers and 2012 practice level Index of Multiple Deprivation scores.

Findings We found that higher levels of fluoride in drinking water provide a useful contribution for predicting prevalence of hypothyroidism. We found that practices located in the West Midlands (a wholly fluoridated area) are nearly twice as likely to report high hypothyroidism prevalence in comparison to Greater Manchester (non-fluoridated area).

Interpretation In many areas of the world, hypothyroidism is a major health concern and in addition to other factors—such as iodine deficiency—fluoride exposure should be considered as a contributing factor. The findings of the study raise particular concerns about the validity of community fluoridation as a safe public health measure.

6 Replies

"We are facing an obesity epidemic in the west could this be one of the factors in this highly complex problem?"

Yes. That and putting unfermented soy in just about all processed foods. We've been saying that for years.


Did you know that if you clean your teeth with a fluoride toothpaste then have a glass of fluoridated water you are over the 'safe'limit?

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Kind of scary isn't it! In the quest of health we shut down our children's thyroids.

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Except that there's nothing healthy about industrial waste, which is what the fluoride added to water and toothpaste is. And they know it! It's a cheap way of getting rid of the waste and making some money at the same time!

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There is NO proof that there is any improvement in childrens teeth! Parents need to stop feeding them sweets.


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