A meta-analysis looking at 74 studies from around the world claims to have found a correlation between fluoride exposure and children's IQs. The review, which came out of the US, included data from a New Zealand study done more than 10 years ago.
Professor Jonathan Broadbent was the lead author of the New Zealand-based research, which was drawn from data from the Dunedin Multidisciplinary Study. He joins Jim to discuss the findings.
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