Author Interviews, Cognitive Issues, Environmental Risks, NIH, Pediatrics / 27.08.2024
NIEHS Examines Link Between Flouride in Water and IQ in Children
MedicalResearch.com Interview with:
Rick Woychik, Ph.D.
Director of the National Toxicology Program
Director of the National Institute of Environmental Health Sciences
Principal Investigator
Mammalian Genome Research Group
Division for Intramural Research at NIEHS
MedicalResearch.com: What is the background for this study?
[caption id="attachment_62975" align="alignleft" width="200"] Source[/caption]
Response: Since 1945, the use of fluoride has been a successful public health initiative for reducing dental cavities and improving general oral health of adults and children. There is a concern, however, that some pregnant women and children may be getting more fluoride than they need because they now get fluoride from many sources including treated public water, water-added foods and beverages, teas, toothpaste, floss, and mouthwash, and the combined total intake of fluoride may exceed safe amounts.
Therefore, the National Toxicology Program (NTP) conducted a systematic review of the published scientific literature on the association between fluoride exposure and neurodevelopment and cognition. The NTP released their findings in a State of the Science Monograph on August 21, 2024, and posted to the NTP website. A corresponding meta-analysis on children’s IQ has been accepted by a scientific journal for publication later in 2024.
The NTP started this work in 2016. As with all research documents intended for publication, the NTP fluoride monograph and meta-analysis underwent rigorous scientific evaluation. The evaluation process has involved many steps. The draft fluoride monograph received significant critical feedback during peer-review by the National Academies of Science, Engineering and Medicine (NASEM), from other external experts, and from experts in several federal health agencies. After modifications were made, additional evaluation following a rigorous scientific framework was conducted by subject matter experts organized by the NTP Board of Scientific Counselors. I am very pleased that this document is now complete and available for reference.
Since fluoride is such an important topic to the public and to public health officials, it was imperative that we made every effort to get the science right. I commend the report authors, the NTP Board of Scientific Counselors, and countless subject matter experts who participated in this evaluation. The monograph represents a thorough review of the data, and the various interpretations of the data, to accurately reflect what we know and where additional research is needed.
Source[/caption]
Response: Since 1945, the use of fluoride has been a successful public health initiative for reducing dental cavities and improving general oral health of adults and children. There is a concern, however, that some pregnant women and children may be getting more fluoride than they need because they now get fluoride from many sources including treated public water, water-added foods and beverages, teas, toothpaste, floss, and mouthwash, and the combined total intake of fluoride may exceed safe amounts.
Therefore, the National Toxicology Program (NTP) conducted a systematic review of the published scientific literature on the association between fluoride exposure and neurodevelopment and cognition. The NTP released their findings in a State of the Science Monograph on August 21, 2024, and posted to the NTP website. A corresponding meta-analysis on children’s IQ has been accepted by a scientific journal for publication later in 2024.
The NTP started this work in 2016. As with all research documents intended for publication, the NTP fluoride monograph and meta-analysis underwent rigorous scientific evaluation. The evaluation process has involved many steps. The draft fluoride monograph received significant critical feedback during peer-review by the National Academies of Science, Engineering and Medicine (NASEM), from other external experts, and from experts in several federal health agencies. After modifications were made, additional evaluation following a rigorous scientific framework was conducted by subject matter experts organized by the NTP Board of Scientific Counselors. I am very pleased that this document is now complete and available for reference.
Since fluoride is such an important topic to the public and to public health officials, it was imperative that we made every effort to get the science right. I commend the report authors, the NTP Board of Scientific Counselors, and countless subject matter experts who participated in this evaluation. The monograph represents a thorough review of the data, and the various interpretations of the data, to accurately reflect what we know and where additional research is needed.
Dr. Lazarus[/caption]
Philip Lazarus, PhD
Boeing Distinguished Professor, Pharmaceutical Sciences
Professor, Dept of Pharmaceutical Sciences
College of Pharmacy and Pharmaceutical Sciences
Washington State University
Spokane, WA 99210
MedicalResearch.com: What is the background for this study?
Response: Smoking and tobacco use remains a major health issue. Smokers use cigarette over the course of the day because the levels of nicotine, the addictive agent in cigarettes and other forms of tobacco, dimmish with time in the bloodstream due to the breakdown of nicotine by enzymes in the body. By inhibiting the breakdown of nicotine in smokers, one would expect that the levels of nicotine would remain higher after smoking a single cigarette, and that these individuals may not require lighting up another cigarette so quickly, reducing the number of cigarettes smoked over the course of a day. This could have a profound effect on reducing the overall harm incurred from smoking or from using other forms of tobacco.
In a single previous study, smokers who used a CBD inhaler exhibited a 40% reduction in cigarette use. In addition, while cannabis users are often smokers, previous studies have indicated that they smoke less cigarettes than non-cannabis-using cigarette smokers. In previous studies published in 2021, we found that major cannabinoids present in cannabis like THC and CBD inhibit major metabolizing enzymes in our body, including several that are important in drug metabolism. We hypothesized that CBD and its major active metabolite, 7-hydroxy (OH)-CBD, may also be inhibiting one or more of the enzymes important in the metabolism (or breakdown) of nicotine.
Dr. Goodrich[/caption]
Jesse Goodrich PhD
Assistant Professor
Department of Population and Public Health Sciences
Keck School of Medicine
University of Southern California
MedicalResearch.com: What is the background for this study?
Response: Per- and poly-fluoroalkyl substances (PFAS) are a group of persistent chemicals that are known to interfere with hormones and metabolism. In our previous research, we have found that PFAS exposure is associated several specific diseases, especially in children and adolescents. These include obesity, type 2 diabetes, liver disease, and even liver cancer. However, we are still only just starting to fully understand all of the health effects of the many different PFAS in existence. Previous studies have focused primarily on one or two main PFAS. However, there are over 9,000 known PFAS, and people are exposed not just to a single PFAS but to mixtures of many PFAS. Importantly, the combination of these chemical exposures may affect us differently than single exposures alone.
To address this challenge, we used an innovative approach to study design to examine how exposure to PFAS impacts biological processes which may underly the development of many different diseases in adolescents and young adults. To do this, we first measured thousands of naturally occurring chemicals, known as metabolites, in people's blood. Then, using a new biostatistical method developed by our team, we identified how exposure to a mixture of several PFAS impacted each individual chemical. Finally, we used this information to determine which biological processes are changed by PFAS exposure.
Dr. White[/caption]
Alexandra J. White, PhD, MSPH
Stadtman Investigator
Epidemiology Branch
National Institute of Environmental Health Sciences
National Institutes of Health
Research Triangle Park, NC
MedicalResearch.com: What is the background for this study? What is the chemical primarily used in hair straighteners?
Response: Hair products such as dye and chemical straighteners contain several different chemicals that may act as carcinogens or endocrine disruptors and thus may be important for cancer risk. Straighteners in particular have been found to include chemicals such as phthalates, parabens, cyclosiloxanes and metals and may release formaldehyde when heated. Previous research has suggested that hair dye and chemical straighteners are related to other hormone-sensitive cancers such as breast and ovarian cancer, but no previous study has considered how they are related to uterine cancer risk.
