Abstract

After previously excluding iodine and lead as confounding factors, the aim of the present study, conducted in June 2013, was to consider whether arsenic was a confounding factor in the studies of children’s intelligence in Wamiao and Xinhuai. Fluoride and arsenic levels were measured in water samples from the 37 household shallow wells still in use for providing water for washing but not drinking, 17 in Wamiao and 20 in Xinhuai. The fluoride levels in the household shallow wells in Wamiao (2.28±0.44 mg/L, range: 1.66–3.18 mg/L) were significantly higher than those in Xinhuai (0.38±0.21 mg/L, range: 0.15–0.77 mg/L) (t=17.08, p=0.000). In contrast, the levels of arsenic in Xinhuai (16.40±19.11 ug/L, range: 0–48.50 ug/L) were significantly higher than those in Wamiao (0.24±0.26 ug/L, range: 0–0.50 ug/L) (t=3.48, p=0.001). In our 2003 study, in high-fluoride Wamiao (mean drinking water F=2.47 mg/L) the average IQ was 8.4 points lower (92.02 vs. 100.41) than in the low-fluoride Xinhuai (mean drinking water F=0.36 mg/L). These results make it very unlikely that the differences in IQ of the children living in Wamiao and Xinhuai are the result of differences in exposure to arsenic rather than to fluoride.

• Related Studies :

  • Arsenic and fluoride exposure in drinking water: children’s IQ and growth in Shanyin County, Shanxi Province, China.

    Background: Recently, in a cross-sectional study of 201 children in Araihazar, Bangladesh, exposure to arsenic (As) in drinking water has been shown to lower the scores on tests that measure children’s intellectual function before and after adjustment for sociodemographic features. Objectives: We investigated the effects of As and fluoride exposure on

  • Influence of fluoride exposure on reaction time and visuospatial organization in children

    Fluoride exposure is an important public health problem in several Mexican states. In the city of San Luis Potosi, Mexico, above 90% of the children have some degree of dental fluorosis. The main source of exposure to fluoride is tap water. The objective of the study was to evaluate the

  • Decreased intelligence in children and exposure to fluoride and arsenic in drinking water.

    Recent evidence suggests that fluoride (F) and arsenic (As) may adversely affect intelligence quotient (IQ) scores. We explore the association between exposure to F and As in drinking water and intelligence in children. Three rural communities in Mexico with contrasting levels of F and As in drinking water were studied:

  • The effect of high levels of arsenic and fluoride on the development of children’s intelligence.

    In the fields of toxicology, histology, physiology and biochemistry, numerous research and reports have already been conducted on the poisonous effect of arsenic poisoning, fluoride poisoning, as well as the combined effect of arsenic and fluoride poisoning. Progress has been made likewise in relevant medical treatment, clinical diagnosis and water clean-up prevention

  • Investigation and evaluation on intelligence and growth of children in endemic fluorosis and arsenism areas.

    “This study investigated the effects of arsenism and fluorosis on the mental ability (MA) and growth of children living in areas endemic for arsenism, fluorosis , or both. The children were divided into high arsenic/fluoride group (group 1), high fluoride group (group 2), high arsenic group (group 3), and control

• Related FAN Content :

  • Fluoride & IQ: The 65 Studies

    As of May 2020, a total of 73 studies have investigated the relationship between fluoride and human intelligence. Of these investigations, 65 studies have found that elevated fluoride exposure is associated with reduced IQ in humans, while over 60 animal studies have found that fluoride exposure impairs the learning and/or

  • Fluoride Affects Learning & Memory in Animals

    An association between elevated fluoride exposure and reduced intelligence has now been observed in 65 IQ studies. Although a link between fluoride and intelligence might initially seem surprising or random, it is actually consistent with a large body of animal research. This animal research includes the following 45 studies (out

  • Fluoride's Effect on Fetal Brain

    The human placenta does not prevent the passage of fluoride from a pregnant mother's bloodstream to the fetus. As a result, a fetus can be harmed by fluoride ingested pregnancy. Based on research from China, the fetal brain is one of the organs susceptible to fluoride poisoning. As highlighted by the excerpts

  • Fluoride's Direct Effects on Brain: Animal Studies

    The possibility that fluoride ingestion may impair intelligence and other indices of neurological function is supported by a vast body of animal research, including over 40 studies that have investigated fluoride's effects on brain quality in animals. As discussed by the National Research Council, the studies have consistently demonstrated that fluoride, at widely varying concentrations, is toxic to the brain.

  • NRC (2006): Fluoride's Neurotoxicity and Neurobehavioral Effects

    The NRC's analysis on fluoride and the brain.