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Daily News Blog

Archive for the 'behavioral and cognitive effects' Category


18
Jul

Developmental Neurotoxic Effects of Widely Used Neonicotinoid Insecticide Underestimated by EPA

(Beyond Pesticides, July 18, 2024) A recent study in The Journal of Toxicological Sciences shows that a single dose of the neonicotinoid insecticide clothianidin (CLO) induces behavioral abnormalities, predominantly in female mice, throughout key stages of development. In testing mice at various ages, sex-specific changes were identified that highlight not only varied effects on males and females but also how pesticide exposure at a young age can cause lasting impacts throughout adulthood in mammalian species.  The researchers, at the Laboratory of Animal Reproduction and Development at Tohoku University in Japan, “utilized murine [mouse] models to compare the sex-specific differences in behavioral effects following CLO exposure at different developmental stages. [They] orally administered CLO to male and female mice as a single high-dose solution (80 mg/kg) during the postnatal period (2-week-old), adolescence (6-week-old), or maturity (10-week-old), and subsequently evaluated higher brain function.”   As the authors remark, “Most studies on the neurotoxicity of CLO have targeted only males, with limited insights regarding the neurodevelopmental toxicity in females. There are significant sex differences in brain development due to hormonal, genetic, epigenetic, and other sex-specific factors. Moreover, there are also a number of sex-based differences in the prevalence of developmental disorders, such as […]

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02
Jul

Recent Studies Continue To Highlight Connection Between Depression and Suicide in Pesticide-Exposed Farmers

(Beyond Pesticides, July 2, 2024) Men’s Mental Health Awareness Month, which took place last month, evokes concern about the growing body of science linking pesticide exposure to neurological effects linked to depression. Recent studies reveal elevated rates of psychiatric disorders, including suicide, among farmers, with problems more common for males.  Through systematic reviews, meta-analyses, surveys and interviews, and blood sampling, these three studies add to the growing body of science linking pesticide exposure to neurological impacts. First, in the Journal of Agromedicine, researchers from Greece and the United Kingdom review eight studies and find a significant positive association between pesticide poisoning and depression in agricultural populations.1 Second, a study in Toxicology shows a link between depression in Brazilian farmers and pesticide exposure, most notably with glyphosate usage.2 Third, the latest study in Environmental Toxicology and Pharmacology focuses on work by researchers from Spain in identifying farmers exposed to chlorpyrifos, mancozeb, and malathion that have higher rates of depressive symptoms and suicide attempts.3  Through a meta-analysis of published research, the authors of the Agromedicine journal article identify pesticide poisoning as a risk factor of depression. With depression affecting more than 264 million individuals worldwide, this is a field of interest with […]

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04
Jun

Presence of Weed Killer Glyphosate in Human Sperm Elevates Debate on Pesticide Threats to Human Survival 

(Beyond Pesticides, June 4, 2024) A study published in the most recent edition of the journal Ecotoxicology and Environmental Safety documents for the first time the presence of the herbicide glyphosate in human sperm. The study looked at 128 French men with an average age of 36 years who tested positive for glyphosate in their blood. Seventy-three out of the 128 men were found to also have glyphosate in their seminal plasma. Not only that, the amount of glyphosate in seminal plasma was nearly four times higher than what was detected in the blood.   Methods  The study involved a population of 128 infertile French men from whom seminal and blood plasma samples were collected. The study was conducted at the “Pole SantĂŠ LĂŠonard de Vinci” medical center, located centrally near Tours, France. This region is recognized for its urban characteristics as well as being a major agricultural hub, particularly for grain and wine production. The study authors note, “This area reflects the common herbicide exposure in France” and the district ranks third highest in terms of pesticide purchases. While additional qualitative data was collected, only 47 of 128 participants fully completed a questionnaire about their profession, diet (organic or […]

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06
Mar

Inspector General Finds Widely Used Flea Collars Still Not Fully Evaluated by EPA 

(Beyond Pesticides, March 6, 2024) With over 2,500 pet deaths and 900 reports of adverse effects to people, an Office of Inspector General (OIG) report, published on February 29, 2024, reveals multiple systemic failures by the U.S. Environmental Protection Agency’s (EPA) Office of Pesticide Programs (OPP), citing inadequate safety reviews of Seresto pet collars. The report, The EPA Needs to Determine Whether Seresto Pet Collars Pose an Unreasonable Risk to Pet Health, concludes, “The EPA’s response to reported pesticide incidents involving Seresto pet collars has not provided assurance that they can be used without posing unreasonable adverse effects to the environment, including pets.” At the time the animal effects made headlines in 2021, the agency defended the product’s registration, telling the media that, despite these incidents, EPA deemed Seresto collars “‘eligible for continued registration’ based on best available science, including incident data… No pesticide is completely without harm, but EPA ensures that there are measures on the product label that reduce risk.” Despite the scathing criticism, EPA maintains the position that it conducted an adequate review of the two active insecticide ingredients in the pet collars—the neurotoxic insecticide flumethrin, and the notorious neonicotinoid imidacloprid—proven to have adverse effects on the endocrine system as […]

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08
Feb

Mother’s Glyphosate Exposure During Pregnancy Increases Child’s Risk of Poor Brain Function and Development

(Beyond Pesticides, February 8, 2024) A study published in Environmental Research finds an association between adverse neurodevelopment (brain function and development) among infants and exposure to the herbicide glyphosate during pregnancy (gestational). Moreover, neurodevelopment becomes more pronounced at 24 months or two years. The increasing prevalence of neurodevelopmental disorders (NDDs) in the United States has raised concerns about the impact of toxic exposures on child development. Given the disproportionate exposure burden in the U.S., children from marginalized groups and low-income families are more likely to face a variety of harmful threats that can negatively affect childhood development. These disparities are linked to neurodevelopmental disorders. NDDs are defined as conditions related to the functioning of the nervous system and the brain, including attention-deficit/hyperactivity disorder (ADHD), autism, learning difficulties, intellectual disability (cognitive impairment), conduct disorders, cerebral palsy, and challenges related to vision and hearing. Therefore, the study notes, “Given glyphosate’s wide usage, further investigation into the impact of gestational glyphosate exposure on neurodevelopment is warranted.” The study includes mother-child pairs in a Puerto Rican birth cohort called PROTECT-CRECE, which measures urinary glyphosate and aminomethylphosphonic acid (AMPA; a metabolite [breakdown product]) of glyphosate) levels from mother and child for analysis. The study collected samples from the mother up to […]

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19
Jan

Study Shines Light on Common Herbicides 2,4-D and Glyphosate Impacts on Behavioral Function

(Beyond Pesticides, January 19, 2024) A study published in Environmental Health Perspective is one of the first to indicate a link between exposure to the herbicides 2,4-D and glyphosate and the impairment of behavioral performance (i.e., attention/inhibitory control, memory/learning, language, visuospatial processing, and social perception). These adverse effects associated with the neurotoxic impacts of pesticides on behavior have been previously documented. For example, a study in August 2023 finds oral intake (e.g., eating contaminated foods), inhalation, and dermal exposure to glyphosate lowered cognitive function scores, increased the likelihood of severe depressive symptoms, and impaired auditory (hearing) function. Although previous studies find neurotoxic effects from exposure to these herbicides, very few until now have evaluated how this neurotoxic exposure impacts neurotypical behavior among youth (children and teenagers). The ubiquitous use of glyphosate and 2,4-D use in agriculture—which leaves residues of the toxic chemicals in food and in public areas (e.g., parks and walkways) creates a creates a significant risk for exposure. Glyphosate is already implicated in or proven to lead to the development of numerous health anomalies, including cancer, while 2,4-D also has a range of potential hazards, including cancer. Therefore, studies like this help local and government officials make holistic decisions regarding the use […]

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04
Jan

Work-Related Pesticide Exposure Puts Farmers at Risk of Cognitive (Intellectual) Harm

(Beyond Pesticides, January 4, 2024) A review published in the Journal of Neurosciences in Rural Practice finds an association between farmers’ pesticide exposure and cognitive impairment. Specifically, farmers suffer from attention deficit, lack of information processing, non-comprehension of verbal cues, slow processing speed, memory loss, sluggishness, speech difficulties, and impaired motor function. Additionally, the risk of adverse effects from exposure increases with time spent around pesticides, like in other occupational (work-related) settings. Although pesticide exposure may not be the only factor involved in cognitive impairment, exposure can work synergistically (together) with other factors, triggering neurotoxicity. Pesticides play various roles in causing or exacerbating adverse health outcomes like neurotoxic effects and chemical damage to the brain. Numerous pesticides impair neurological function, especially for chronically exposed individuals (e.g., farmworkers) or during critical windows of vulnerability and development (e.g., childhood, pregnancy). Mounting evidence over the past years shows that chronic exposure to sublethal (low) levels of pesticides adversely affects the central nervous system (CNS) and neural receptors, such as connections between nerves, the brain, enzymes, and DNA. Specifically, researchers identify agricultural chemical exposure as a cause of many adverse CNS impacts and neurological diseases, including Alzheimer’s, amyotrophic lateral sclerosis (ALS), and Parkinson’s disease. The researchers reviewed scientific articles published in […]

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28
Nov

New Federal Law Seeks to Protect Pregnant Workers, Farmworkers at Elevated Risk

With the elevated adverse impacts associated with pesticides and reproductive health, the Pregnant Workers Fairness Act (PWFA) law may be used to improve protections for farmworkers and other high-risk employees.

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06
Jul

Prenatal Exposure to Organophosphate Pesticides Have Links to Behavior

(Beyond Pesticides, July 6, 2023) A study published in Environmental Health Perspectives finds concentrations of organophosphate (OP) metabolites in urine during the prenatal phase have links to adolescent/young adult externalizing (e.g., hyperactivity, aggression, attention problems) and internalizing (e.g., depression) behavior problems. Thus, prenatal exposure to OP pesticides can permanently affect behavioral health as children mature into adulthood. This study adds to the growing body of research reinforcing the adverse effects of organophosphate (OP) exposure on cognitive health and neurological development, especially for infants and children. Prenatal development is one of the most vulnerable periods of exposure, as the fetus is most susceptible to the harmful effects of chemical contaminants. Many studies indicate that prenatal and early-life exposure to environmental toxicants increases susceptibility to diseases, from learning and developmental disabilities to cancer. Given research links to pesticide exposure and neurological and cognitive development, studies like this can help government and health officials identify how pesticides’ impact on the brain elevates health concerns.  Researchers gathered two urine samples from mothers during pregnancy (at weeks 13 and 26) and five urine samples from offspring from the ages of six months to five years old to measure urinary dialkylphosphates (DAPs) (nonspecific OP metabolites). Subsequently, the study also assesses reports of […]

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09
Mar

Prenatal Pesticide Exposure Threatens Children’s Language Development at 18 Months after Birth, Study Finds

(Beyond Pesticides, March 9, 2023) A study published in Environmental Research finds exposure to organophosphate (OP) compounds during pregnancy, or prenatal OP exposure can cause shortfalls in language development abilities at 18 months, stifling preschool-age language expression. Additionally, a timely and co-occurring study published in Environmental International confirms similar results, highlighting that chlorpyrifos (an organophosphate) impedes neurological and psychological development, including language communication and all motor skills of offspring at 12 and 18 months old. Prenatal development is one of the most vulnerable periods of exposure, as the fetus is most susceptible to the harmful effects of chemical contaminants. Many studies indicate that prenatal and early-life exposure to environmental toxicants increases susceptibility to diseases, from learning and developmental disabilities to cancer. Given research links to pesticide exposure and neurological and cognitive development, studies like this can help government and health officials identify how pesticides’ impact on the brain elevates health concerns. The Environmental Research authors note, “The etiology [cause] of language development is complex, and this work further highlights the importance of the prenatal environment as a mechanism of influence that are associated with deficits in early language acquisition and ability, which could signal increased behavioral problems and academic difficulties in later childhood that extend […]

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20
Dec

Mother and Child Health: Learning Disorders and Prenatal Pesticide Exposure Study Results Released

(Beyond Pesticide, December 20, 2022) A meta-analysis published in Chemosphere finds prenatal pesticide exposure, or pesticide exposure during pregnancy has a positive association with autism spectrum disorder (ASD) and attention deficit/hyperactive disorder (ADHD). Particularly, exposure to chemical classes organophosphate (OP) and pyrethroid (PYR) insecticides, in addition to the mother’s age during pregnancy (≥30 years old), increased the risk factor of ASD. ADHD risk increases among offspring whose mothers encounter organochlorine pesticides (OCPs) during gestation. The etiology or cause of ASD and ADHD involves the interaction of multiple components, including lifestyle and genetics. However, emerging evidence indicates that environmental contaminants like pesticides (e.g., occupational exposures, air pollution, solvents, dietary residues, etc.) play a role in disease etiology. Pesticide contamination is widespread in all ecosystems, and chemical compounds can accumulate in human tissues resulting in chronic health effects.  ADHD is estimated to affect 8-12% of school-age children worldwide. While it is a complex disease, and genetics may play a role, no specific genes have been identified, and there is increasing evidence that environmental factors like pesticide exposure facilitate the development of the condition. Additionally, U.S. Centers for Disease Control and Prevention (CDC) estimates that 1 in 54 children have been diagnosed with an autism spectrum […]

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19
Oct

Over a Decade and Countless Children Poisoned, EPA Bans Hazardous Flea Collar Products

(Beyond Pesticides, October 19, 2022) Pet flea collars containing the insecticide tetrachlorvinphos (TCVP) are set to be banned by the U.S. Environmental Protection Agency, according to the agency’s long overdue response to a petition from the Natural Resources Defense Council (NRDC). The highly toxic pesticide has not been used on crops since 1987, yet was permitted for decades in flea collars where children could be intimately exposed to the chemical while petting and playing with the family pet. The decade-long process of bringing use of these products to an end exposes the failures of the U.S. pesticide regulatory system, and how EPA’s weak and flawed decisions that infect the marketplace with severe consequences. One may ask: How many veterinarians prescribed these dangerous flea collars to pet owners, assuming that EPA has properly assessed exposure risks to their human owners? Advocates concerned about EPA’s ongoing propensity to defer to the pesticide industry are urging an overhaul of the regulatory process and a reorientation toward toxic pesticide elimination and the adoption of organic in order to address serious health and environmental threats. NRDC originally filed its petition to ban all uses of TCVP in 2009. The petition noted that the agency completely […]

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