Claim: peer reviewed research from major universities shows fluoride in the water supply has been lowering childrens IQ for decades and the government has known and done nothing about it

The claim that fluoride in the water supply lowers children's IQ is mostly false. While some peer-reviewed studies suggest a correlation between high fluoride levels and lower IQ, particularly in areas with concentrations above 1.5 mg/L, the evidence is not conclusive for typical community fluoridation levels. Critics argue that many studies have high bias and that recent analyses show no significant effect at recommended levels. Disputes arise from concerns about study design and the applicability of findings to U.S. water fluoridation practices. Thus, the assertion lacks strong support from the broader scientific community. The graders interpret the evidence differently, so the score range widens. Perplexity comes in highest (50%), while Gemini is lowest (30%). Gemini expresses higher confidence than Perplexity on this claim. Opposing sources highlight that many studies linking fluoride to lower IQ have significant biases and methodological flaws. For instance, a critique of the JAMA meta-analysis points out that the studies included often did not accurately reflect community fluoridation levels, which are typically much lower than those studied. Additionally, recent reviews have found no association between fluoride at recommended levels and IQ. This uncertainty about the applicability of the findings to U.S. water fluoridation practices suggests that the claim may not hold true under scrutiny, impacting the overall assessment of its validity.