If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Chinese children drinking well water with very high levels of fluoride scored poorly on intelligence testing
Wang SX, ZH Wang, XT Cheng, J Li, ZP Sang, XD Zhang, LL Han, SY Qiao,
ZM Wu and ZQ Wang. 2007. Arsenic and fluoride exposure in drinking water: children's IQ and growth in Shanyin County, Shanxi province, China. Environmental Health Perspectives 115(4):643-7. July 5, 2007 Context What did they do? What did they find? What does it mean? Resources More new science from EHN Synopsis by Sheela Sathyanarayana and Wendy Hessler Chinese children drinking well water with very high levels of fluoride scored poorly on intelligence testing compared to those with lower exposures. This is one of the first studies in humans to find that too much fluoride is associated with low performance on intelligence tests. More information is needed to ascertain if the sum total amount of ingested fluoride from tap water, consumer products and other sources are enough to inhibit brain development in children living in the US and other countries where fluoridation is common. Chinese students taking test. http://ilena-rosenthal.blogspot.com http://www.environmentalhealthnews.o...5wangetal.html Context: Fluoride is a recommended additive to public water supplies to promote healthy teeth. The Centers for Disease Control and Prevention reports that 66% of the US population receives fluoridated water through the taps in their homes. Fluoride combats tooth decay in two ways. It strengthens tooth enamel, and it allows teeth damaged by acid to repair, or remineralize, themselves. Excessive fluoride intake can have negative consequences on bone, teeth and the brain. Too much of the ion can lead to skeletal fluorosis, a condition in which teeth have weak enamel and bones have poor mineralization. Exposure to high levels of fluoride may also alter brain development, according to recent studies of Chinese populations . Studies from rural China, albeit done with inappropriate controls, suggest fluoride may harm the developing brain (Grandjean and Landrigan 2006). Young children are the most vulnerable to the neurodevelopmental effects from too much fluoride (Xiang et al. 2003). What did they do? Wang et al. examined 524 children (exposed and controls) aged 8 to 12 years old in China's Shanxi province for fluoride exposures in relation to intellectual functioning and growth. The families were exposed to naturally occurring high concentrations of fluoride through well water. The children were compared to control children who were recruited from three nearby villages with uniformly low concentrations of fluoride in well water. All children lived in areas with similar geography, cultural conditions and socioeconomic development. The authors obtained urine samples for fluoride analyses and conducted physical exams. Medically trained professionals administered standardized neurodevelopmental tests. What did they find? Very high fluoride concentrations -- as high as 8.3 milligrams per liter (mg/L) -- were measured in the well water of the high fluoride group while the control group's well water had just 0.5 mg/L of fluoride. The percentage of children with IQ scores less than 70 increased from 0 in the control group to 4% in the high fluoride group. The percentage of children with IQ scores greater than 109 was 41% in the control group and decreased to 30% in the high fluoride group. Overall, children in the high fluoride group had a four-point reduction in IQ score as compared to the control children. Measured fluoride in the urine was almost five times higher in the high fluoride exposed children than in the controls (5.1 mg/L versus 1.5 mg/L in controls). All of these associations were statistically significant. What does it mean? Fluoride may affect brain development in growing children exposed to high levels of the ion through drinking water. Lower overall IQ scores, a greater number of lower scores and fewer higher scores were found in the group of children drinking high fluoride well water when compared with children who drank well water with lower amounts of fluoride. The observed differences in testing could affect a child's ability to perform in school. The results have significant public health implications given that tap water and many other products contain fluoride. It may be that many children are receiving high of doses of fluoride in the US. The drinking water concentrations of fluoride observed in this study are likely well above concentrations in US public drinking water supplies, but children may be receiving excess fluoride through multiple sources (drinking water, soft drinks/bottled water, toothpaste, mouth rinses). At this time, there are no studies quantitating the sum of all fluoride exposures for an average child in the US. The American Dental Association has recommended that infants not be given formula reconstituted with fluoridated water to prevent excess exposures. Further studies should measure all fluoride exposures to children to prevent fluorosis and potential neurodevelopmental toxicities. |
#2
|
|||
|
|||
Chinese children drinking well water with very high levels of fluoride scored poorly on intelligence testing
On Jul 5, 11:25 am, Ilena Rose wrote:
Wang SX, ZH Wang, XT Cheng, J Li, ZP Sang, XD Zhang, LL Han, SY Qiao, ZM Wu and ZQ Wang. 2007. Arsenic and fluoride exposure in drinking water: children's IQ and growth in Shanyin County, Shanxi province, China. Environmental Health Perspectives 115(4):643-7. July 5, 2007 Context What did they do? What did they find? What does it mean? Resources More new science from EHN Synopsis by Sheela Sathyanarayana and Wendy Hessler Chinese children drinking well water with very high levels of fluoride scored poorly on intelligence testing compared to those with lower exposures. This is one of the first studies in humans to find that too much fluoride is associated with low performance on intelligence tests. More information is needed to ascertain if the sum total amount of ingested fluoride from tap water, consumer products and other sources are enough to inhibit brain development in children living in the US and other countries where fluoridation is common. Chinese students taking test. http://ilena-rosenthal.blogspot.com http://www.environmentalhealthnews.o...2007-0705wange... Context: Fluoride is a recommended additive to public water supplies to promote healthy teeth. The Centers for Disease Control and Prevention reports that 66% of the US population receives fluoridated water through the taps in their homes. Fluoride combats tooth decay in two ways. It strengthens tooth enamel, and it allows teeth damaged by acid to repair, or remineralize, themselves. Excessive fluoride intake can have negative consequences on bone, teeth and the brain. Too much of the ion can lead to skeletal fluorosis, a condition in which teeth have weak enamel and bones have poor mineralization. Exposure to high levels of fluoride may also alter brain development, according to recent studies of Chinese populations . Studies from rural China, albeit done with inappropriate controls, suggest fluoride may harm the developing brain (Grandjean and Landrigan 2006). Young children are the most vulnerable to the neurodevelopmental effects from too much fluoride (Xiang et al. 2003). What did they do? Wang et al. examined 524 children (exposed and controls) aged 8 to 12 years old in China's Shanxi province for fluoride exposures in relation to intellectual functioning and growth. The families were exposed to naturally occurring high concentrations of fluoride through well water. The children were compared to control children who were recruited from three nearby villages with uniformly low concentrations of fluoride in well water. All children lived in areas with similar geography, cultural conditions and socioeconomic development. The authors obtained urine samples for fluoride analyses and conducted physical exams. Medically trained professionals administered standardized neurodevelopmental tests. What did they find? Very high fluoride concentrations -- as high as 8.3 milligrams per liter (mg/L) -- were measured in the well water of the high fluoride group while the control group's well water had just 0.5 mg/L of fluoride. The percentage of children with IQ scores less than 70 increased from 0 in the control group to 4% in the high fluoride group. The percentage of children with IQ scores greater than 109 was 41% in the control group and decreased to 30% in the high fluoride group. Overall, children in the high fluoride group had a four-point reduction in IQ score as compared to the control children. Measured fluoride in the urine was almost five times higher in the high fluoride exposed children than in the controls (5.1 mg/L versus 1.5 mg/L in controls). All of these associations were statistically significant. What does it mean? Fluoride may affect brain development in growing children exposed to high levels of the ion through drinking water. Lower overall IQ scores, a greater number of lower scores and fewer higher scores were found in the group of children drinking high fluoride well water when compared with children who drank well water with lower amounts of fluoride. The observed differences in testing could affect a child's ability to perform in school. The results have significant public health implications given that tap water and many other products contain fluoride. It may be that many children are receiving high of doses of fluoride in the US. The drinking water concentrations of fluoride observed in this study are likely well above concentrations in US public drinking water supplies, but children may be receiving excess fluoride through multiple sources (drinking water, soft drinks/bottled water, toothpaste, mouth rinses). At this time, there are no studies quantitating the sum of all fluoride exposures for an average child in the US. The American Dental Association has recommended that infants not be given formula reconstituted with fluoridated water to prevent excess exposures. Further studies should measure all fluoride exposures to children to prevent fluorosis and potential neurodevelopmental toxicities. --------------- Sh-h-h-h-h ! -------------------- Christ all ****in' mighty! Don't spread this stuff around! The chinks'll start shipping "pure natural spring water" to the U.S. at 50- cents a bottle! --------------- |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
video: ongoing deliberate fluoride poisoning of your drinking water w/industrial waste | [email protected] | Pregnancy | 0 | October 24th 06 03:36 AM |
watch online: history of deliberate fluoride poisoning w/industrial waste added to drinking water | [email protected] | Breastfeeding | 1 | October 23rd 06 12:03 AM |
watch online: history of deliberate fluoride poisoning w/industrial waste added to drinking water | [email protected] | Kids Health | 0 | October 22nd 06 03:28 PM |
Disneyland's toxic drinking water (also: Bizarre Irish fluoride blarney) | Todd Gastaldo | Pregnancy | 6 | June 30th 04 04:05 PM |
Drinking water and pooping | [email protected] | Breastfeeding | 2 | January 19th 04 01:33 PM |