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Hormone-disrupting chemical mixtures linked to excess childhood weight · U.S. Right to Know articles

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  Hormone disrupting chemical mixtures linked to excess childhood weight. Key
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  findings. Multiple hormone-disrupting chemicals were linked to obesity.
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  from childhood through adolescence. Prenatal exposure to metals, organochlorine pesticides, and
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  PFIS was linked to higher obesity. Childhood exposure to phenols and certain
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  phthalates was linked to more body fat in adolescence. Children exposed during
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  pregnancy and early life to combinations of chemicals that disrupt hormones and
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  metabolism may face a greater risk of excess weight that persists into
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  adolescence, a new study suggests. Published this month, September 2026, in Environment
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  International, the study followed 1,301 mother-child pairs from six European birth cohorts.
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  Researchers measured prenatal and childhood exposure to 45 endocrine disrupting chemicals, EDCs,
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  across nine chemical classes. These included per and polyfluoroalkyl substances PFS,
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  phthalates, pesticides, polychlorinated biphenols, PCBs, flame retardants, metals, parabens, and phenols,
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  including bisphenyl A, BPA, and triclosin. Researchers found that greater exposure to
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  certain combinations of EDCs was associated with higher BMI. They also found
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  links to more body fat and higher odds of overweight. About 28
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  of the children had overweight or obesity at age 8, rising to
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  about 30 by age 15. The findings add to growing evidence linking
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  chemical exposures during critical stages of development to obesity risk. Obesity in
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  children is defined as having a body mass index, BMI, an estimate
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  of total body fat at or above the 95th percentile for age
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  and sex. Unlike most earlier studies, which examined chemicals one at a
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  time, this research assessed mixtures that more closely reflect real life. People
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  typically encounter many chemicals at once through food, drinking water, plastics, and
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  personal care products. Prenatal exposure to metals, synthetic, chlorine containing pesticides,
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  and PFAS was linked to higher obesity rates, while childhood phenols and
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  some phthalates were associated with more adolescent excessive body fat, adiposity. PFAS,
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  also known as for river chemicals, are highly persistent chemicals used in
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  nonstick cookware, food packaging, stain-resistant fabrics, and firefighting foams, among other common
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  items. Which chemical exposures were linked to higher BMI and body fat.
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  Researchers found Children with higher prenatal organochlorine pesticide exposure had higher BMI,
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  and 48 higher odds of overweight in childhood, and 45 higher odds
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  in adolescence. Researchers saw the link in boys but not girls. Hexachlorobenzene,
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  HCB, a persistent chemical once widely used as a fungicide, contributed most
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  strongly to the association. Li>Children
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  with higher prenatal PFAS exposure had more body fat in childhood. And
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  adolescence. Children with higher prenatal metal exposure had higher BMI and 47
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  higher odds of overweight in childhood. Those with higher childhood metal exposure
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  had 72 higher odds of overweight in adolescence and more body fat.
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  Children with greater exposure to phenols and certain phthalates used in polyvinyl
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  chloride, PVC, a plastic used in pipes, flooring, and packaging had higher
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  adolescent BMI. Those with more exposure to organochlorine pesticides, PCBs, and parabens
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  had lower BMI. Higher prenatal PCB exposure was linked to 20 lower
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  odds of overweight in childhood and 33 lower odds in adolescence. Though
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  researchers said reverse causation may partly explain the pattern. Body fat can
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  reduce the amount of these chemicals circulating in the blood. PCBs are
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  long-lasting industrial chemicals once used in electrical equipment and other products. Children
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  with relatively high prenatal exposure to cadmium and manganese had the largest
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  increases in BMI by adolescence, suggesting chemicals may also act together. These
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  findings have important Public Health, implications, as they underscore the need to
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  prevent exposure to harmful chemical mixtures, particularly during pregnancy and early childhood,
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  as a way to curb the growing obesity epidemic, the researchers wrote.
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  Joseph Braun, professor of epidemiology at Brown University's School of Public Health,
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  called the results significant. They show that prenatal exposure to EDCs may
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  have effects that extend to late adolescence. A time when body fatness
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  stabilizes, he said. More importantly, this study accounted for the potential impact
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  of mixtures of EDCs rather than just one chemical at a time.
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  Given that we live in this chemical soup, it is important to
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  understand the total effect of these EDCs. Why early life exposure to
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  endocrine disrupting chemicals matters? Early life is a critical period for tissue
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  and organ development, making babies and children especially vulnerable. Organochlorine pesticides,
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  for instance, may increase body fat by disrupting hormones. They may also
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  promote fat storage, interfere with metabolism, and trigger inflammation in fat tissue.
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  More than one third of US children and adolescents ages two to
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  nineteen have overweight or obesity, according to the latest federal data. In
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  thirty seven European countries, more than one in four children ages seven
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  to nine have overweight or obesity, WHO data shows. Children with obesity
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  face an increased risk of chronic diseases in adulthood, including type 2
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  diabetes, cardiovascular disease, and cancer. Meanwhile, exposures to EDCs is widespread.
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  Some EDCs, including pesticides, PCBs, and PFAS, persist and accumulate in body
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  tissues. Others, including phenols and phthalates, break down quickly in the body,
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  but repeated exposure leads to more risk. How did researchers measure chemical
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  exposures and obesity risk? Researchers use data from They European Human Early
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  Life Exposure project, which includes birth cohorts in the UK, France, Spain,
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  Lithuania, Norway, and Greece. They measured prenatal chemical
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  exposure using maternal blood or urine during pregnancy, or cord blood at
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  birth. They used blood or urine to measure childhood exposure. At follow
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  ups between ages six and eighteen, trained staff measured height, weight, waist
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  circumference, and body fat. They also accounted
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  for factors that could affect both chemical exposure and weight, including maternal
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  age and BMI, smoking during pregnancy, fish consumption, and childhood exposure
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  to tobacco smoke. Could inflammation help link chemical exposure to obesity Researchers
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  measured 36 blood proteins to look for biological pathways linking prenatal chemical
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  exposure to adolescent BMI. The found that inflammatory and metabolic proteins accounted
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  for about 30 of The link between prenatal metal exposure and higher
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  adolescent BMI, they found. These may affect insulin signaling, which helps control
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  blood sugar, energy balance, and fat storage. Early life exposure to EDC
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  mixtures may reprogram metabolic and inflammatory pathways, predisposing children to obesity that
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  persists into adolescence, the researchers wrote. While the analysis does not prove
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  that inflammation caused the later weight changes, the finding aligns with earlier
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  helicks and other research. The study suggests immune changes may also play
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  a much smaller role. Protecting children's health from endocrine disruptor harms. Some
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  study participants dropped out before later follow ups, reducing the available data.
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  Of the original group, 607 had complete adolescent body measurements. Statistical adjustments
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  for those losses did not substantially change the results. Some chemicals were
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  not detected in many samples, and the researchers had particular difficulty measuring
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  short-lived chemicals. A single urine measurement may not reflect a child's usual
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  exposure, they noted. Measurements also could not identify whether exposure occurred through
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  food, air, or skin contact. Future research should include larger, more diverse
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  populations and better measurement of short-lived chemicals the researchers noted. It should
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  also include other types of biological data to better understand how chemical
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  exposures might contribute to obesity. Strengthening chemical regulation and promoting safer
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  alternatives in consumer products and food packaging may represent actionable strategies to
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  mitigate early early life environmental contributors to obesity and related chronic diseases.
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  They wrote. Reference GUIL Omre N. Midia V, India Aldana S. Et
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  al. Prenatal and childhood exposure to mixtures of endocrine disrupting chemicals in
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  association with measures of adiposity in childhood and adolescence. Inviron Ints 2026,
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  215, 110495, doi 10.1016 slash J dot envent.2026.110495.