Fluoride Levels In Drinking Water Associated With Hypothyroidism

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. 

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