The environment that we live in is toxic. It is worrisome to think that the status quo has occurred with the help of corporations knowingly dumping harmful chemicals into the environment.

The Environmental Working Group (EWG) has studied the current state of our world in great detail and has discovered that before a child is even born they already have approximately 287 toxins in their blood and tissues. These results came from 10 newborns whose parents gave permission to have their toxins measured at birth.

The results of this study indicate that an average of 200 chemicals was found in each newborn. Of the toxins tested, 47 were consumer ingredients such as cosmetics, 212 were industrial and pesticide byproducts. In this study, only around 400 total chemicals were actually tested for - thousands of others may have been found if larger parameters were used.

Many of the toxins measured in the newborns included plastics, flame retardants, and other chemicals that disrupt brain function, IQ, hormones, and the nervous system of the child. Some of the toxins observed like DDT, have actually been banned since 1972 (over 3 decades ago), but are still being measured in laboratory samples. Certain chemicals never fully degrade in the environment.

So, there is not question about it, the environment we live in is toxic. All of us have disease-creating toxins inside of our bodies, the question boils down to which ones and how much.

But there are some solutions: lab tests and detoxification.

Among which, a meta-analysis (Choi et al.,) - a statistical analysis that combines the results of multiple studies - found that in 26 out of 27 studies, children in a high-fluoridated community had lower IQ scores, on average, compared to children in a low-fluoridated community. Conversely, another group of researchers found no differences in IQ between children living in communities with artificially-fluoridated and those in a non-fluoridated community. Regarding the latter research, however, substantial methodological limitations have been identified; one key limitation of this study is that the difference in fluoride intake between fluoridated and non-fluoridated communities was small, thereby reducing the power of the study to detect an effect of fluoride on IQ.

Based on research that found a relationship between exposure to fluoride and lowered IQ, which accounted for various confounding variables, a daily dose should not exceed 0.005 mg of fluoride per day, or 0.0010 mg of fluoride per kilogram of bodyweight per day, for children aged 8-13 years.

Several groups of researchers indicate that fluoride is a developmental neurotoxicant in humans. In addition, a separate group of researchers observed a significant association between the prevalence of artificial water fluoridation and  and the prevalence of attention deficit-hyperactivity disorder (ADHD) in the United States.

Another group of researchers observed a significant inverse relationship between both urinary and serum fluoride levels and IQ among children. The researchers observed a statistically significant IQ difference of 4.3 IQ points between the high (n=106) and control (n=110) urinary fluoride groups. Similarly, another group of researchers observed that both serum fluoride, and urine fluoride were significantly related to water fluoride levels, and both were also significantly related to lowered IQ. The high urinary fluoride level group, the IQ point difference, compared to the control group, was 2.42 points per milligram of fluoride per liter.

Regardless of the mechanism(s), the researchers observed that children who lived in areas with high fluoride exposure had lower IQ scores, compared to those who lived in low-exposure areas.

While this research does not touch on the question of whether such a level in drinking water offers dental health benefits, it indicates that an intake rate greater than 0.047 mg F/day poses a significant risk of lowering IQ of exposed children.

The current average mean fluoride exposures for US children range from about 0.80 mg F/day to about 1.65 mg F/day. These doses are 17 to 35 times higher than the higher estimated reference dose of 0.047 mg F/day. These results imply that at present the risk of IQ loss among children in the US is high.

Fluoride may be similar to lead and mercury in having no threshold below which exposures may be considered safe.

In a population of 320 million, the population level impact of an average 5 IQ point loss, beyond purely dollars of income loss, is a reduction of about 4 million people with IQ>130 and an increase of almost as many people with IQ<70.