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FoundMyFitness · 2024-09-20 · Rhonda Patrick (host)

What Microplastics Are Doing to the Brain, Body, and Reproductive Systems

73 research-tied claims examined: 5 contradicted 4 overstated 6 context 52 supported 6 unverified

52

Supported by research

0:00:22Rhonda Patrick (host)supportedlow

Higher levels of plastics like PVC in the reproductive system are linked to lower sperm counts.

"In the reproductive system, higher levels of plastic like PVC have been linked to lower sperm counts, and it doesn't stop there." (said at 0:00:22)

Preliminary observational studies have identified micro- and nanoplastics, including polyvinyl chloride (PVC) and polyethylene, within human and mammalian testes and seminal fluid, linking plastic presence to reduced semen parameters. For example, a 2024 study examining canine and human testicular tissue identified widespread microplastic contamination (predominantly polyethylene and PVC) and observed negative correlations with testicular weight and canine sperm parameters. Additionally, a multicenter study of human semen found that greater exposure to mixed microplastics was associated with significant reductions in total sperm count, sperm concentration, and progressive motility. However, existing human evidence remains limited to small cross-sectional cohorts.

0:02:22Rhonda Patrick (host)supportedmoderate

More than 70% of microplastics originate from the breakdown and oxidation of larger plastics rather than primary additions.

"Actually, more than 70% of microplastics come from this breakdown from larger plastics, while the rest are intentionally added to everyday products like microbeads in cosmetics, fibers in our synthetic clothing, and also industrial plastics used in manufacturing." (said at 0:02:22)

Published environmental reviews and global mass-balance evaluations (such as the International Union for Conservation of Nature global assessment) establish that secondary microplastics—particles formed through the weathering, oxidation, and mechanical fragmentation of larger plastic waste—account for approximately 70% to 85% of environmental microplastics, while primary microplastics (manufactured intentionally as small particles such as cosmetic microbeads, resin pellets, or shed synthetic fibers) make up the remaining 15% to 30%.

0:03:16Rhonda Patrick (host)supportedlow

The average person inhales or ingests up to 120,000 microplastic particles per year from tap water, bottled water, and packaged foods.

"The average person inhales or ingests up to 120,000 microplastic particles per year from sources like tap water, bottled water, and packaged foods." (said at 0:03:16)

A 2019 exposure assessment by Cox et al. evaluated microplastic concentrations across common dietary sources, drinking water, and air. The authors estimated that annual microplastic intake through diet alone ranges from 39,000 to 52,000 particles, which increases to between 74,000 and 121,000 particles annually when inhalation is included. The study also noted that drinking exclusively bottled water adds approximately 90,000 microplastic particles per year compared to 4,000 from tap water. Because these estimates are derived from observational modeling across studies covering only ~15% of caloric intake and carry substantial methodological uncertainty, the evidence certainty is low.

  • supports: Human Consumption of Microplastics. (Environmental science & technology 2019) · cited 2691x in the literature
    "Evaluating approximately 15% of Americans' caloric intake, we estimate that annual microplastics consumption ranges from 39000 to 52000 particles depending on age and sex. These estimates increase to 74000 and 121000 when inhalation is considered. Additionally, individuals who meet their recommended water intake through only bottled sources may be ingesting an additional 90000 microplastics annually, compared to 4000 microplastics for those who consume only tap water." (abstract, results, passage verified)
    pubmedfull study (doi)
0:04:08Rhonda Patrick (host)supportedlow

Individuals who drink bottled water exclusively consume up to 90,000 additional plastic particles per year compared to those drinking only tap water.

"Studies show that people who drink bottled water exclusively could consume up to 90,000 more additional plastic particles per year compared to those who only drink tap water." (said at 0:04:08)

A 2019 exposure modeling study synthesizing data from 26 studies evaluated microplastic ingestion in the American diet. The authors calculated that individuals meeting their recommended fluid intake exclusively from bottled water consume an estimated additional 90,000 microplastic particles annually compared to approximately 4,000 particles annually for individuals who drink only tap water.

0:05:53Rhonda Patrick (host)supportedmoderate

A study in the Journal of Hypertension showed that drinking from aluminum cans lined with BPA-containing resin raises blood pressure within a few hours.

"Actually, a study published in the Journal of Hypertension found that drinking from aluminum cans lined with BPA-containing resin can increase blood pressure within just a few hours" (said at 0:05:53)

A 2015 randomized crossover trial published in the journal Hypertension (often referred to as the Journal of Hypertension) evaluated 60 adults aged 60 and older who consumed identical beverages packaged in either cans (lined with BPA-containing epoxy resin) or glass bottles. Two hours post-consumption, urinary BPA concentrations increased by more than 1600% and adjusted systolic blood pressure increased by approximately 4.5 mm Hg following canned beverage consumption compared to glass bottled beverage consumption.

  • supports: Exposure to bisphenol A from drinking canned beverages increases blood pressure: randomize… (Hypertension (Dallas, Tex. : 1979) 2015) · cited 121x in the literature
    "We conducted a randomized crossover trial with noninstitutionalized adults, who were aged ≥60 years and recruited from a local community center. A total of 60 participants visited the study site 3 times, and they were provided the same beverage in 2 glass bottles, 2 cans, or 1 can and 1 glass bottle at a time. The sequence of the beverage was randomized. We then measured urinary BPA concentration, blood pressure, and heart rate variability 2 hours after the consumption of each beverage... Systolic blood pressure adjusted for daily variance increased by ≈4.5 mm Hg after consuming 2 canned beverages compared with that after consuming 2 glass bottled beverages, and the difference was statistically significant... The present study demonstrated that consuming canned beverage and consequent increase of BPA exposure increase blood pressure acutely." (abstract, results and conclusions, passage verified)
    pubmedfull study (doi)
0:06:12Rhonda Patrick (host)supportedlow

Higher levels of phthalates correlate with decreased testosterone levels in males.

"Research actually has reported that higher levels of phthalates correlate with decreased testosterone levels in males, affecting everything from muscle mass to mood." (said at 0:06:12)

Cross-sectional epidemiological analyses, such as those using National Health and Nutrition Examination Survey (NHANES) data, consistently demonstrate that elevated urinary concentrations of specific phthalate metabolites (such as metabolites of di-2-ethylhexyl phthalate [DEHP] and dibutyl phthalate [DBP]) correlate with significantly lower serum total and free testosterone concentrations in boys and adult men. Because the available human evidence is primarily cross-sectional and observational, causal certainty is low.

0:07:44Rhonda Patrick (host)supportedmoderate

Heating polycarbonate bottles to 100°C increases the release of BPA by up to 55 times.

"So one study found that heating polycarbonate bottles to just 100° C can increase the release of BPA up to 55 times." (said at 0:07:44)

A 2008 laboratory study investigated bisphenol A (BPA) migration from polycarbonate drinking bottles into water. While baseline migration at room temperature ranged from 0.20 to 0.79 ng/h, exposure to boiling water (100°C) increased the rate of BPA migration by up to 55-fold, directly supporting the speaker's claim.

0:08:03Rhonda Patrick (host)supportedmoderate

Microwaving food in plastic containers can release over 4 million microplastic particles into a meal within 3 minutes.

"So a recent study found that microwaving food in plastic containers can release over 4 million microplastic particles into a meal in just 3 minutes, along of course with the chemicals they carry." (said at 0:08:03)

A 2023 laboratory study published in Environmental Science & Technology tested microplastic and nanoplastic release from commercially available polypropylene containers and polyethylene pouches using food simulants (deionized water and 3% acetic acid). The authors found that microwave heating caused the highest release of plastic particles, with some containers releasing up to 4.22 million microplastics (and over 2 billion nanoplastics) per square centimeter of container surface area within 3 minutes of microwave heating.

0:08:28Rhonda Patrick (host)supportedmoderate

PFAS chemicals have a half-life of 2 to 5 years in the human body.

"Remember, PFAS are called forever chemicals because they are very resistant to degradation; in fact, the half-life in our bodies is from 2 to 5 years." (said at 0:08:28)

Published pharmacokinetic studies in humans indicate that the serum elimination half-lives for the most commonly studied legacy PFAS compounds (such as PFOA and PFOS) fall within approximately 2 to 5 years (with PFOA averaging around 3.5 to 3.8 years and PFOS averaging around 4.8 to 5.4 years, though some congeners like PFHxS can persist even longer).

0:12:47Rhonda Patrick (host)supportedlow

Microplastics are capable of reaching the deep, lower regions of human lungs.

"One study found that microplastics could reach the lower regions of the lungs, which was previously thought to be unlikely due to the body's natural filtration mechanisms." (said at 0:12:47)

A landmark 2022 observational study analyzing surgical human lung tissue samples (n = 13) using micro-Fourier-transform infrared (μFTIR) spectroscopy detected microplastics in all lung regions, with the highest concentrations found in the lower lung lobes. After adjusting for background contamination, microplastic levels were 1.65 ± 0.88 MP/g in the lower region, compared to 0.23 ± 0.28 MP/g in the upper region and 0.33 ± 0.37 MP/g in the middle/lingular region.

0:13:29Rhonda Patrick (host)supportedvery low

Liver tissue from patients with cirrhosis contains significantly higher levels of microplastics than healthy liver tissue.

"A study compared liver tissue samples from individuals with liver cirrhosis compared to those who had healthy livers. The cirrhotic livers contained significantly higher levels of microplastics compared to normal healthy livers, suggesting these microplastic particles could play a role in liver disease progression." (said at 0:13:29)

The host's statement accurately reflects published findings comparing liver samples from individuals with cirrhosis and controls. A 2022 proof-of-concept case series examined human liver tissue samples from patients with liver cirrhosis and individuals without underlying liver disease. Microplastics were detected in all cirrhotic liver tissue samples, whereas none were detected in non-cirrhotic controls, yielding a statistically significant difference between the two groups. The study authors similarly concluded that future research is required to determine whether microplastics contribute to liver disease progression or accumulate as a consequence of cirrhosis and altered vascular flow. However, because this evidence originates from small proof-of-concept pilot studies (e.g., n=11 in the primary comparative study), the overall certainty of the evidence is very low.

0:14:50Rhonda Patrick (host)supportedlow

Microplastics have been detected on both maternal and fetal sides of human placentas post-birth as well as in amniotic membranes.

"A study discovered microplastics in human placentas collected after birth. The microplastic particles were found on both the maternal and fetal sides of the placenta as well as within the amniotic membranes." (said at 0:14:50)

A pioneering 2021 study by Ragusa and colleagues analyzed human placentas collected after physiological pregnancies and deliveries using Raman Microspectroscopy. They identified microplastic fragments across multiple placental compartments: 5 particles were detected on the fetal side, 4 on the maternal side, and 3 within the chorioamniotic membranes.

0:15:25Rhonda Patrick (host)supportedlow

Microplastics have been identified in human testicular tissue, sperm, and the blood-testis barrier.

"Human studies have detected microplastics in testicular tissue, in sperm, and even in the blood-testis barrier." (said at 0:15:25)

Multiple analytical human studies have identified microplastics in human testicular tissue and semen/sperm samples. Using methods such as pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and laser direct infrared spectroscopy (LD-IR), researchers have detected various polymer types (including polyethylene, polystyrene, and polyvinyl chloride) across human testes and seminal fluid. Because the seminiferous tubules and developing germ cells are anatomically shielded by the blood-testis barrier, the detection of micro- and nanoplastics within testicular tissue and semen demonstrates their presence within and penetration across this barrier.

0:15:51Rhonda Patrick (host)supportedlow

A 2022 study found microplastics in 80% of human blood samples tested, averaging 1.6 micrograms per milliliter.

"So one study published in 2022 was the first to detect microplastics in human blood samples. Researchers found that 80% of the participants had measurable levels of microplastics in their blood, with an average concentration of about 1.6 micrograms per milliliter." (said at 0:15:51)

A 2022 pilot biomonitoring study by Leslie et al. (PMID 35367073) analyzed whole blood samples from 22 healthy volunteers and was the first to quantify plastic particles in human blood. Quantifiable levels of plastic polymers (including polyethylene terephthalate, polyethylene, and styrene polymers) were detected in 17 of the 22 donors (approximately 77-80%), with a mean total quantifiable concentration of 1.6 µg/mL. Due to the small sample size (n=22) and exploratory nature of the study, the certainty of evidence for broad population prevalence is low, but the claim accurately describes the findings of the 2022 study.

0:16:47Rhonda Patrick (host)supportedlow

Microplastic counts in blood increase after cardiac surgery compared to before surgery.

"A study involving cardiac surgery patients found that the number of microplastics in their blood increased after surgery compared to before surgery." (said at 0:16:47)

A prospective observational study evaluating children undergoing congenital heart surgery with cardiopulmonary bypass found that total micro- and nanoplastic concentrations and particle counts in blood were significantly higher after surgery than before surgery (p < 0.0001 for mass levels and p = 0.015 for particle counts via laser direct infrared spectroscopy). Other preliminary studies examining cardiac surgery and cardiovascular interventions have similarly demonstrated increased microplastic diversity and detection in post-procedure blood samples compared to pre-procedure baselines.

0:20:21Rhonda Patrick (host)supportedmoderate

Consuming canned soup daily for 5 days caused a 1,200% increase in urinary BPA levels relative to consuming fresh soup.

"For example, one study had participants consume canned soup daily for 5 days, which led to a 1,200% increase in urinary BPA levels compared to those who consumed fresh soup." (said at 0:20:21)

In a randomized crossover trial published in JAMA (Carwile et al., 2011), participants consumed canned soup or freshly prepared soup daily for 5 days. Daily canned soup intake led to a 1,221% increase in urinary bisphenol A (BPA) concentrations relative to fresh soup consumption (geometric mean urinary BPA of 20.8 µg/L following canned soup intake compared with 1.1 µg/L following fresh soup intake). The claim accurately summarizes the design and findings of this study.

0:24:21Rhonda Patrick (host)supportedmoderate

Higher maternal phthalate levels during pregnancy correlate with reduced anogenital distance in male infants.

"Multiple studies have now shown that higher phthalate levels during pregnancy are linked to a significant shortening of the anogenital distance in male boys." (said at 0:24:21)

Multiple prospective cohort studies and systematic reviews have demonstrated an inverse association between maternal urinary concentrations of certain phthalate metabolites (particularly di-(2-ethylhexyl) phthalate [DEHP], di-n-butyl phthalate [DBP], and benzyl butyl phthalate [BBP]) during pregnancy and anogenital distance (AGD) in male newborns and infants. A systematic review and meta-analysis of prospective human cohorts found a statistically significant decrease in male AGD (-4.07% per log10 increase in maternal DEHP metabolites), which aligns with extensive toxicological data in animal models.

0:25:38Rhonda Patrick (host)supportedlow

Elevated phthalate levels in adult men are linked to lower sperm quality and decreased testosterone.

"Research has shown that men with elevated phthalate levels have lower sperm quality and reduced testosterone levels, directly impacting fertility and overall hormone balance." (said at 0:25:38)

Epidemiological studies and systematic reviews consistently link elevated urinary levels of phthalate metabolites (such as DEHP, MBP, and MiBP) in adult men to lower serum testosterone levels and impaired semen quality, including reduced sperm motility, abnormal morphology, and increased sperm DNA damage. Because the vast majority of human data come from cross-sectional observational studies, evidence of causality remains low certainty under GRADE criteria, but the claim accurately summarizes what published research has demonstrated.

0:28:38Rhonda Patrick (host)supportedlow

Children diagnosed with autism spectrum disorder have an impaired capacity to metabolize and detoxify BPA.

"So one study found that children with autism spectrum disorder actually struggle to metabolize BPA, so their bodies aren't detoxifying the chemical as efficiently, so it builds up, especially in its active form, free BPA" (said at 0:28:38)

Cross-sectional metabolomic studies led by Stein and colleagues observed that children diagnosed with autism spectrum disorder (ASD) display a reduced capacity to metabolize and detoxify bisphenol A (BPA) via glucuronidation compared to neurotypical controls. In a 2015 study evaluating urine specimens from 46 children with ASD and 52 control children, significant differences were identified in total BPA concentration and the percentage of bound (glucuronidated) BPA. A 2023 follow-up study analyzing 66 children with ASD and 37 controls observed an 11% reduction in BPA glucuronidation efficiency in the ASD cohort (p = 0.020), indicating reduced hepatic detoxification and potential increased tissue exposure. Because the supporting evidence derives from small observational cross-sectional studies measuring urinary excretion profiles, certainty is low, but the finding directly supports the host's statement.

0:30:13Rhonda Patrick (host)supportedlow

Children exposed to higher levels of BPA during pregnancy are more likely to develop ADHD, anxiety, and depression later in childhood.

"that kids who were exposed to higher levels of BPA during pregnancy were more likely to develop ADHD along with anxiety and depression later in childhood." (said at 0:30:13)

Prospective cohort studies and systematic reviews have consistently found associations between maternal exposure to higher levels of bisphenol A (BPA) during pregnancy and increased risk of neurobehavioral issues in children, including attention-deficit/hyperactivity symptoms, anxiety, and depression. Because evidence relies on observational longitudinal cohorts measuring urinary BPA concentrations and child behavioral assessments, causal certainty is limited by residual confounding and heterogeneity across sex-stratified outcomes.

0:31:14Rhonda Patrick (host)supportedlow

Vitamin D deficiency during pregnancy disrupts serotonin production, which may affect autism risk.

"In fact, vitamin D deficiency during pregnancy may also disrupt serotonin production, which could affect autism risk." (said at 0:31:14)

The statement accurately reflects published mechanistic and observational research. Mechanistic studies demonstrate that the active vitamin D hormone regulates serotonin synthesis by activating tryptophan hydroxylase 2 (TPH2) transcription in the brain, and that vitamin D deficiency can impair central serotonin production. In human observational studies, systematic reviews and meta-analyses consistently find that lower maternal 25-hydroxyvitamin D levels during pregnancy are associated with an increased risk of autism spectrum disorder and autistic traits in offspring. Because the epidemiological evidence is observational and the specific causal pathway involving serotonin synthesis relies primarily on mechanistic and animal models, the overall certainty is graded as low.

0:31:44Rhonda Patrick (host)supportedvery low

BPA induces oxidative stress and generates free radicals in the brain that impair synaptic plasticity.

"So on top of that, BPA also induces oxidative stress in the brain. So this means it's generating harmful free radicals that damage brain cells. It impairs their ability to communicate and to adapt—this is what we call synaptic plasticity." (said at 0:31:44)

Preclinical and mechanistic evidence in animal models and cell cultures supports the claim that bisphenol A (BPA) exposure induces oxidative stress in neural tissue, damages neurons, and disrupts synaptic plasticity and cognitive function. Because this evidence is derived from in vitro and animal models rather than direct human clinical trials, the GRADE certainty is very low.

0:32:37Rhonda Patrick (host)supportedvery low

Nanoplastics smaller than 1 micrometer can cross the blood-brain barrier.

"But there's emerging evidence suggesting that microplastics, especially the smaller nanoplastics—so these are less than one micrometer—can actually cross the blood-brain barrier." (said at 0:32:37)

Emerging preclinical and observational evidence supports the claim that nanoplastics (typically defined as particles <1 µm) can cross biological barriers, including the blood-brain barrier. In rodent models, orally administered sub-micron polystyrene particles (e.g., 0.293 µm), but not larger microplastics, were detected in brain tissue within hours of ingestion, facilitated by biomolecular surface corona interactions. Systematic reviews of rodent models and postmortem human tissue analyses have consistently identified nanoplastics in central nervous system tissues, though evidence in living humans remains preliminary and mechanistic conclusions rely largely on experimental animal and in vitro models.

0:32:49Rhonda Patrick (host)supportedvery low

Polystyrene microplastics accumulate in the hippocampus and prefrontal cortex and trigger spikes in pro-inflammatory cytokines TNF-alpha and IL-6.

"For example, one study found that polystyrene microplastics were accumulating in critical brain regions like the hippocampus and the prefrontal cortex... When these microplastics settle into brain tissue, they can trigger an inflammatory response. They spike levels of pro-inflammatory cytokines like TNF-alpha, IL-6." (said at 0:32:49)

Animal and preclinical studies show that polystyrene plastic particles can accumulate in regions of the brain including the hippocampus and prefrontal cortex, triggering microglial activation and significant increases in pro-inflammatory cytokines such as TNF-α and IL-6. For instance, gestational exposure studies in rats demonstrated dose-dependent elevations of TNF-α and IL-6 in the prefrontal cortex, hippocampus, and striatum, alongside oxidative stress. However, because this evidence is derived exclusively from rodent and in vitro models, the certainty for human health outcomes is very low.

0:33:48Rhonda Patrick (host)supportedlow

In an autopsy study of 91 human brain samples, the brain contained 10 to 20 times more microplastic than the liver or kidney samples.

"In one study, researchers examined tissues from livers, kidneys, and brains of autopsied individuals. While all organs contained microplastics—that's concerning—the brain samples alone were particularly concerning because, on average, of the 91 brain samples studied, they contained 10 to 20 times more plastic in the brains than other organs." (said at 0:33:48)

A 2024–2025 autopsy study led by Matthew Campen and colleagues analyzed micro- and nanoplastics (MNPs) across postmortem human liver, kidney, and brain samples using pyrolysis gas chromatography-mass spectrometry. The study evaluated 91 human brain samples (across 2016 and 2024 cohorts, including dementia cases) and found that brain tissue accumulated substantially higher concentrations of plastics—predominantly polyethylene—averaging roughly 10 to 20 times the concentrations measured in liver and kidney tissues from the same decedents. As an observational postmortem study, the GRADE certainty is low, but the claim accurately reflects the published study's findings.

  • supports: Bioaccumulation of Microplastics in Decedent Human Brains Assessed by Pyrolysis Gas Chroma… (Research square 2024) · cited 73x in the literature
    "Applying pyrolysis gas chromatography-mass spectrometry (Py-GC/MS) methods to isolate and quantify MNPs from human samples, we compared MNP accumulation in kidneys, livers, and brains. Autopsy samples from the Office of the Medical Investigator in Albuquerque, NM, collected in 2016 and in 2024, were digested for Py-GC/MS analysis of 12 polymers. Brains exhibited higher concentrations of MNPs than liver or kidney samples." (abstract, results, passage verified)
    pubmedfull study (doi)
  • supports: Bioaccumulation of microplastics in decedent human brains. (Nature medicine 2025) · cited 804x in the literature
    "Complementary methods for the robust detection of tissue MNPs, including pyrolysis gas chromatography-mass spectrometry, attenuated total reflectance-Fourier transform infrared spectroscopy and electron microscopy with energy-dispersive spectroscopy, confirm the presence of MNPs in human kidney, liver and brain. MNPs in these organs primarily consist of polyethylene, with lesser but significant concentrations of other polymers. Brain tissues harbor higher proportions of polyethylene compared to the composition of the plastics in liver or kidney" (abstract, results, passage verified)
    pubmedfull study (doi)
0:34:18Rhonda Patrick (host)supportedlow

Brain samples from individuals who died with dementia contained up to 10 times more plastic by weight compared to brain samples from individuals without dementia.

"Among the brain samples studied, 12 were from individuals who had died with dementia, including Alzheimer's disease. These samples contained up to 10 times more plastic by weight compared to those people who had plastics in their brains without dementia." (said at 0:34:18)

A 2025 post-mortem tissue study published in Nature Medicine examined micro- and nanoplastics (MNPs) across decedent human organs, including brain samples from individuals with documented dementia diagnoses. The researchers found significantly greater accumulation of plastics (primarily polyethylene fragments) in dementia brain samples compared to controls without dementia, reaching concentrations up to approximately 10-fold higher by weight. Because these findings are observational, cross-sectional, and based on a small sample of decedent brains, they establish an association rather than proof that microplastics cause dementia.

0:34:52Rhonda Patrick (host)supportedlow

Human brain samples from 2024 contained approximately 50% more plastic than comparable samples from 2016.

"So human brain samples from 2024 had about 50% more plastic than similar samples dating back to 2016." (said at 0:34:52)

A study analyzing micro- and nanoplastic concentrations in human decedent autopsy tissues (published in Nature Medicine and widely reported from its preprint) found that microplastic concentrations in human brain tissue increased significantly between samples collected in 2016 and 2024, representing an approximate 50% increase over that timeframe.

0:37:20Rhonda Patrick (host)supportedlow

Women with higher BPA levels had lower implantation success during IVF.

"One study showed that women with higher BPA levels had lower implantation success during IVF" (said at 0:37:20)

Observational research supports the claim that higher bisphenol A (BPA) levels have been associated with lower implantation rates during IVF. For example, a cohort study of 351 women undergoing IVF found that after adjusting for age, BMI, and baseline hormone levels, higher urinary BPA concentrations were significantly associated with decreased embryo implantation and clinical pregnancy rates. Broader systematic reviews note that while BPA exposure is consistently linked to lower fertilization rates and embryo quality across studies, findings on implantation rates specifically vary across different cohort designs and populations.

0:39:24Rhonda Patrick (host)supportedlow

A study of semen samples from 40 healthy young men found microplastics in 100% of samples, averaging 2 particles per sample, with polystyrene accounting for about 31%.

"There was a study that looked at semen samples from 40 healthy young men—men who should be in their prime reproductive years—and get this: every single sample had microplastics in it. On average, there were two particles per sample, and these weren't just harmless specks. We're talking about plastic particles ranging in size from 0.7 micrometers to 7 micrometers... And the most common type that was found was polystyrene. This is stuff that's found in packaging, it's in containers—that made up around 31% of the total." (said at 0:39:24)

The host accurately summarizes a 2024 cross-sectional study of semen samples from 40 men undergoing premarital health assessments in Jinan, China. Using Raman microspectroscopy, researchers detected microplastics in 100% of the semen samples, finding an average of 2 particles per sample ranging in size from 0.72 to 7.02 µm. Polystyrene was the most common polymer detected, comprising 31% of the identified microplastics. Because this is a single, small observational study (n = 40), the overall certainty of the broader evidence base is low.

0:41:29Rhonda Patrick (host)supportedvery low

Acute exposure to BPA inhibits voltage-gated calcium channels in cardiomyocytes, impairing calcium handling and heart contractions.

"Studies have shown that acute exposure to BPA can inhibit voltage-gated calcium channels, which impairs how cardiomyocytes—these are the cells in our heart—handle calcium. And this disruption can affect how the heart contracts, and it can trigger abnormal activities in the heart muscle." (said at 0:41:29)

In vitro and ex vivo cellular electrophysiology studies demonstrate that acute exposure to bisphenol A (BPA) directly inhibits voltage-gated calcium channels (such as L-type Ca2+ channels) in human-induced pluripotent stem cell-derived cardiomyocytes and rodent cardiac preparations. This inhibition disrupts intracellular calcium transients, decreases cardiomyocyte contractile function, and contributes to electrophysiological alterations and arrhythmogenesis. Because the available evidence consists entirely of mechanistic and in vitro/animal laboratory models, certainty is rated as very low.

0:42:57Rhonda Patrick (host)supportedmoderate

A New England Journal of Medicine study found patients with microplastics in arterial walls were 4.5 times more likely to experience a major cardiovascular event within three years.

"A study published in the New England Journal of Medicine found that patients with microplastics lodged in their arterial walls were 4.5 times more likely to experience a major cardiovascular event, like a heart attack or stroke, within three years compared to patients that did not have microplastics in their arterial walls." (said at 0:42:57)

A 2024 prospective multicenter observational study published in the New England Journal of Medicine (Marfella et al.) evaluated 257 patients who underwent carotid endarterectomy for asymptomatic carotid artery disease. Over a mean follow-up of 33.7 months (approximately three years), patients with microplastics and nanoplastics detected in their carotid atheroma had a significantly higher risk of the composite primary endpoint (myocardial infarction, stroke, or all-cause mortality) compared to those without detected plastics (hazard ratio, 4.53; 95% CI, 2.00 to 10.27; P < 0.001).

0:43:19Rhonda Patrick (host)supportedmoderate

In the NEJM study, microplastics were detected in 58.4% of patients undergoing carotid artery surgery for heart disease.

"Microplastics were detected in 58.4% of patients undergoing surgery for heart disease." (said at 0:43:19)

A prospective multicenter observational study published in The New England Journal of Medicine (Marfella et al., 2024) analyzed excised plaque from patients undergoing carotid endarterectomy for asymptomatic carotid artery disease. Polyethylene micro- and nanoplastics were detected in the carotid artery plaques of 150 out of 257 patients who completed follow-up, which is exactly 58.4%.

0:43:58Rhonda Patrick (host)supportedmoderate

In a randomized controlled trial, participants drinking from BPA-lined cans experienced an acute increase of approximately 4.5 mmHg in systolic blood pressure within hours.

"In a randomized controlled trial, researchers found that participants who drank from BPA-lined cans experienced a significant spike in blood pressure—about 4.5 millimeters of mercury increase in systolic blood pressure within hours." (said at 0:43:58)

A randomized crossover trial of 60 adults aged 60 and older demonstrated that drinking soybean milk from two BPA-lined cans resulted in an acute increase in systolic blood pressure of approximately 4.5 mmHg two hours post-consumption compared to drinking the same beverage from glass bottles.

0:44:33Rhonda Patrick (host)supportedlow

An NHANES study of over 9,000 participants followed for 9 years found highest urinary BPA was associated with a 1.76 times higher CVD mortality, and 2.8 times higher in women.

"A study that analyzed NHANES data from over 9,000 participants followed people for about 9 years and found that those people with the highest urinary BPA levels were 1.76 times more likely to die from cardiovascular disease. Interestingly, these effects were far more pronounced in women. So women in the highest exposure group had about a 2.8 times higher risk of a cardiovascular death compared to women in the lowest group for BPA levels." (said at 0:44:33)

The claim accurately quotes the findings of a 2023 prospective cohort study analyzing NHANES 2003–2016 data linked to mortality records through 2019 (PMID 36807039). Among 9,243 adult participants followed for a median of 9.1 years, those in the highest quartile of creatinine-adjusted urinary BPA concentration had a 1.76-fold increased hazard of cardiovascular disease mortality compared to the lowest quartile (adjusted HR 1.76, 95% CI 1.23–2.52). Subgroup analysis demonstrated a significant interaction by sex, with women in the highest quartile showing an adjusted HR of 2.80 (95% CI 1.56–5.02) for cardiovascular mortality compared to 1.34 (95% CI 0.79–2.24) in men. Because this is an observational cohort study relying on spot urine measurements, the GRADE certainty is rated as low.

  • supports: Association of urinary bisphenol A with cardiovascular and all-cause mortality: National H… (Environmental science and pollution research international 2023) · cited 19x in the literature
    "This study included 9243 adult participants. The median follow-up duration was 9.1 years. During this period, 1200 all-cause deaths occurred, of which 374 were cardiovascular deaths. Compared to the lowest BPA/Cr quartile group, the adjusted HRs of the highest BPA/Cr quartile group were 1.76 (95% CI, 1.23-2.52) for cardiovascular mortality and 1.21 (95% CI, 0.98-1.49) for all-cause mortality. In addition, there was a significant interaction between sex and BPA/Cr (P for interaction = 0.044) for the risk of cardiovascular mortality. The adjusted HR for cardiovascular mortality in female participants was 2.80 (95% CI, 1.56-5.02), while that in male participants was only 1.34 (95% CI, 0.79-2.24)." (abstract, results, passage verified)
    pubmedfull study (doi)
0:46:31Rhonda Patrick (host)supportedlow

A 2022 Danish nationwide study of 1.3 million children found childhood exposure to phthalates in medications was associated with a 20% higher overall childhood cancer risk, nearly 3-fold higher osteosarcoma, and 2-fold higher lymphoma.

"So a study published in 2022 looked at about 1.3 million children in Denmark over a 20-year period. The study found that childhood exposure to phthalates was associated with a 20% higher overall risk of childhood cancer. But it didn't stop there; the study highlighted specific cancers, showing that children exposed to phthalates had nearly a three-fold higher rate of osteosarcoma—this is a rare bone cancer—and they had a two-fold higher rate of lymphoma" (said at 0:46:31)

A 2022 nationwide Danish cohort study (Ahern et al.) evaluated 1,278,685 children born between 1997 and 2017 (a 20-year period) using national prescription and cancer registry data. Childhood exposure to phthalates through prescription medications was associated with an elevated risk of overall childhood cancer, including a nearly three-fold increase in osteosarcoma (hazard ratio [HR] = 2.78, 95% CI: 1.63–4.75) and a two-fold increase in lymphoma (HR = 2.07, 95% CI: 1.36–3.14). Because this is an observational registry-based study where confounding by indication remains possible, the certainty of evidence is rated as low.

0:49:40Rhonda Patrick (host)supportedmoderate

Microplastic particles have been detected inside human lung cancer tumor tissue samples.

"Microplastics have also been found in human tumor samples. In a study that was conducted on patients with lung cancer, researchers found microplastic particles in tumor tissue" (said at 0:49:40)

Multiple observational tissue-analysis studies have detected microplastic particles within human tumor samples, including lung cancer tissues. In human lung cancer specimens, analytical techniques such as Raman microspectroscopy, laser direct infrared imaging, and pyrolysis-gas chromatography-mass spectrometry have documented microplastic polymer types including polypropylene, polyethylene terephthalate, polyethylene, and polyvinyl chloride in tumor tissue samples.

0:53:17Rhonda Patrick (host)supportedmoderate

Reverse osmosis filters can remove up to 99.9% of microplastic particles from water.

"So reverse osmosis filters can remove up to 99.9% of microplastic particles from water." (said at 0:53:17)

Reviews of water treatment membrane technologies confirm that reverse osmosis (RO) and dense membrane filtration processes achieve exceptionally high removal rates of microplastics, with pore sizes (sub-nanometer) significantly smaller than microplastic particles (typically 1 µm to 5 mm), enabling rejection rates of up to and exceeding 99.9%.

  • supports: A review of microplastic removal from water and wastewater by membrane technologies (Water Science & Technology 2023) · cited 190x in the literature
    "According to the literature analysis, membrane technologies, one of the advanced treatment technologies, are the most effective and promising technologies for MP removal from water and wastewater. In this paper, firstly, the properties of MPs commonly present in WWTPs/DWTPs and the MP removal efficiency of WWTPs/DWTPs are briefly reviewed. In addition, research studies on MP removal from water/wastewater by microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), reverse osmosis (RO), and membrane bioreactors (MBRs) are reviewed." (abstract, introduction, passage verified)
    openalexfull study (doi)
0:57:50Rhonda Patrick (host)supportedmoderate

Heating liquids causes BPA leaching to be up to 55 times higher compared to cold liquids.

"I already talked about a study where heat can cause the leaching of BPA up to 55 times higher compared to cold liquids." (said at 0:57:50)

A 2008 study evaluating bisphenol A (BPA) migration from polycarbonate drinking bottles found that exposure to boiling water (100 °C) increased the rate of BPA migration into the liquid by up to 55-fold compared to water stored at room temperature (which ranged from 0.20 to 0.79 ng/h).

0:58:27Rhonda Patrick (host)supportedmoderate

Consuming salt adds an estimated 7,000 microplastic particles to human diet annually, with sea salts containing between 550 and 681 microplastic particles per kilogram.

"Estimates suggest that consuming salt can add around 7,000 microplastic particles to our diet each year, and that's a conservative figure. So sea salt generally has the highest levels of microplastic contamination due to ocean pollution. One study found that sea salts contained anywhere from 550 to 681 microplastic particles per kilogram" (said at 0:58:27)

The speaker's statements directly reflect the findings of a seminal 2015 study examining commercial table salts in China. The researchers analyzed sea, lake, and rock/well salts and determined that sea salts had the highest contamination levels, containing between 550 and 681 microplastic particles per kilogram (compared to 43–364 particles/kg in lake salts and 7–204 particles/kg in rock/well salts). Based on typical salt consumption guidelines and rates, this contamination equates to an estimated intake of several thousand microplastic particles annually from salt alone.

0:59:54Rhonda Patrick (host)supportedhigh

HEPA filters capture airborne particles as small as 0.3 microns.

"They can capture particles as small as 0.3 microns, making them pretty suitable for removing the vast majority of microplastics found in indoor air, many of which range from 10 to 100 microns in size." (said at 0:59:54)

Air filtration standards define high-efficiency particulate air (HEPA) filters by their ability to capture sub-micron particles with high efficiency (typically at the 0.3-micrometer benchmark representing the most penetrating particle size), and published literature confirms that airborne microplastics in indoor environments (including fibers and particulate matter categorized under PM10 and larger fractions up to 100 micrometers) are effectively captured by mechanical air filtration systems.

0:44:02Rhonda Patrick (host)supportedhigh

Hypertension currently affects nearly one third of the global population.

"This is a condition that's already affecting nearly a third of the global population." (said at 0:44:02)

Large-scale global epidemiological analyses confirm that hypertension affects approximately one third of the global adult population (estimated at 31.1% of adults, or approximately 1.3 to 1.4 billion people).

0:48:38Rhonda Patrick (host)supportedvery low

In laboratory settings, low-dose exposure to bisphenol A (BPA) promotes the proliferation and growth of estrogen-sensitive breast cancer cells.

"Studies have shown that even low-dose exposure to BPA can promote the growth of estrogen-sensitive breast cancer cells in laboratory settings." (said at 0:48:38)

In vitro laboratory studies consistently demonstrate that low, environmentally relevant doses of bisphenol A (BPA)—in the nanomolar to picomolar range—stimulate cell proliferation, modulate cell cycle regulators (such as cyclin D1), and promote estradiol biosynthesis in estrogen receptor-positive (ER+) breast cancer cell lines, such as MCF-7 and ZR-75-1. Because this evidence is restricted to in vitro cell culture models, the certainty of evidence for clinical extrapolation is very low, but the claim specifically and accurately describes laboratory findings.

0:59:58Rhonda Patrick (host)supportedmoderate

A large portion of airborne microplastics found in indoor air range from 10 to 100 micrometers in size.

"many of which range from 10 to 100 microns in size." (said at 0:59:58)

Observational and exposure assessment studies characterising indoor airborne microplastics consistently show that a substantial portion of airborne plastic particles and fragments fall within the 10 to 100 micrometer size range. For example, spectroscopic analyses of indoor air have reported mean fragment dimensions of approximately 58.6 ± 55 μm, with observed particle sizes commonly spanning from a few micrometers up to several hundred micrometers.

1:03:01Rhonda Patrick (host)supportedhigh

Thermal paper receipts commonly contain BPA as a color developer, which transfers through the skin into the bloodstream upon handling.

"These receipts often contain BPA, which is used as a color developer in the thermal printing process. So when we handle receipts, BPA can transfer into our skin and potentially enter our bloodstream." (said at 1:03:01)

The claim is accurate. Bisphenol A (BPA) is widely used as a monomeric color developer in thermal paper receipts, where it remains unpolymerized (free). Human observational and pharmacokinetic studies demonstrate that handling thermal paper receipts transfers free BPA onto the skin, which subsequently penetrates the skin and enters systemic circulation (measurable in both blood serum and urine). Serum levels of unconjugated (bioactive) free BPA increase following dermal contact, particularly when hands are wet or after using skin care products or hand sanitizers containing dermal penetration enhancers.

1:03:33Rhonda Patrick (host)supportedmoderate

Using hand sanitizer before handling thermal paper receipts significantly increases the dermal absorption of BPA into the bloodstream.

"In fact, studies have shown that using hand sanitizer before handling receipts can significantly boost BPA absorption into our bloodstream." (said at 1:03:33)

Experimental human research demonstrates that applying hand sanitizers containing dermal penetration enhancers immediately before handling thermal receipt paper substantially increases both the transfer of bisphenol A (BPA) onto the skin and its subsequent systemic absorption. In a pharmacokinetic study measuring serum and urine concentrations in volunteers, holding thermal receipts after hand sanitizer application resulted in rapid and significant increases in unconjugated (bioactive) BPA in serum (reaching ~7 ng/mL) within 90 minutes.

  • supports: Holding thermal receipt paper and eating food after using hand sanitizer results in high s… (PloS one 2014) · cited 203x in the literature
    "Not taken into account when considering thermal paper as a source of BPA exposure is that some commonly used hand sanitizers, as well as other skin care products, contain mixtures of dermal penetration enhancing chemicals that can increase by up to 100 fold the dermal absorption of lipophilic compounds such as BPA. We found that when men and women held thermal receipt paper immediately after using a hand sanitizer with penetration enhancing chemicals, significant free BPA was transferred to their hands and then to French fries that were eaten, and the combination of dermal and oral BPA absorption led to a rapid and dramatic average maximum increase (Cmax) in unconjugated (bioactive) BPA of ∼7 ng/mL in serum and ∼20 µg total BPA/g creatinine in urine within 90 min." (abstract, results, passage verified)
    pubmedfull study (doi)
1:05:07Rhonda Patrick (host)supportedmoderate

Phthalates are cleared by the human body within 12 to 24 hours depending on the compound.

"Phthalates take a bit longer, ranging between 12 to 24 hours depending on the specific compound." (said at 1:05:07)

Human toxicokinetic studies using single oral doses of deuterium-labeled phthalates (such as di-n-butyl phthalate, diisobutyl phthalate, and di(2-ethylhexyl) phthalate) demonstrate that phthalates and their metabolites are rapidly eliminated. Elimination half-lives for primary and secondary oxidative metabolites generally range between 2 and 10 hours, with over 90% of the ingested dose excreted in the urine within 12 to 24 hours.

1:05:29Rhonda Patrick (host)supportedmoderate

PFAS chemicals have an elimination half-life in the human body of 2 to 5 years.

"So unlike BPA or phthalates, the PFAS have a half-life of 2 to 5 years, meaning they accumulate in our organs like the liver and the kidneys, and their persistence in the body makes them much harder to eliminate." (said at 1:05:29)

Human pharmacokinetic and longitudinal biomonitoring studies confirm that legacy per- and polyfluoroalkyl substances (PFAS)—most notably perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA)—have elimination half-lives in the range of approximately 2 to 5 years (with some congeners like perfluorohexanesulfonate [PFHxS] persisting even longer, up to 7–8 years). In contrast to non-persistent compounds like BPA or phthalates (which are eliminated within hours to days), these long-chain PFAS are extensively reabsorbed by the kidneys and bind to proteins in blood and tissues, resulting in multi-year half-lives.

1:05:59Rhonda Patrick (host)supportedmoderate

Nanoplastics can cross biological barriers and enter the systemic bloodstream.

"but the smaller nanoplastics—these are the really, really tiny particles—these are crossing biological barriers and they're entering the bloodstream." (said at 1:05:59)

Scientific evidence demonstrates that nanoplastics (<1 µm) can cross biological barriers (such as the intestinal epithelium, alveolar-capillary/air-blood barrier, and placental barrier) via mechanisms including endocytosis, transcytosis, and paracellular diffusion, enabling them to enter systemic blood circulation and distribute to various tissues. Nanoplastics have been detected in human whole blood, placenta, thrombi, and other internal organs, with translocation pathways well-characterized in animal and cell-culture models.

1:07:23Rhonda Patrick (host)supportedhigh

Sulforaphane increases the urinary excretion of environmental toxins such as benzene and acrolein by up to 60% in humans.

"For instance, studies show that sulforaphane can increase the excretion of toxins like benzene and acrolein, which we get exposed to through air pollution and food, by up to 60%." (said at 1:07:23)

A 12-week randomized clinical trial in 291 adults exposed to airborne pollutants in Qidong, China demonstrated that daily consumption of a broccoli sprout beverage providing sulforaphane and glucoraphanin produced rapid, sustained, and statistically significant increases in the urinary excretion of mercapturic acids derived from benzene (61% increase) and acrolein (23% increase) compared with placebo. Earlier crossover randomized trials and subsequent trials in smokers have confirmed significant increases (ranging between 20% and 60%) in the urinary elimination of these airborne and environmental toxic conjugates.

1:07:41Rhonda Patrick (host)supportedhigh

Broccoli sprouts contain up to 100 times more sulforaphane (or its precursor) than mature broccoli.

"like broccoli sprouts, which contain up to a hundred times more sulforaphane than mature broccoli" (said at 1:07:41)

Seminal phytochemical analyses demonstrated that 3-day-old sprouts of broccoli cultivars contain 10 to 100 times higher concentrations of glucoraphanin (the glucosinolate precursor that is converted into sulforaphane) compared to mature broccoli plants.

1:06:40Rhonda Patrick (host)supportedhigh

Sulforaphane activates the Nrf2 transcription factor pathway, which upregulates Phase 2 detoxification enzymes that convert toxins into water-soluble forms.

"Sulforaphane activates a key pathway called Nrf2. Think of Nrf2 as a master regulator of detoxification: it controls the production of enzymes that help our body clear out many, many toxins. It boosts the Phase 2 detoxification enzymes." (said at 1:06:40)

The biological mechanism stated by the speaker is well established. Sulforaphane (an isothiocyanate found in cruciferous vegetables) acts as a potent activator of the Keap1/Nrf2 (nuclear factor erythroid 2-related factor 2) pathway. Upon activation and nuclear translocation, Nrf2 binds to antioxidant response elements (ARE) to upregulate the expression of Phase 2 detoxification and antioxidant enzymes (such as glutathione S-transferases, NAD(P)H:quinone oxidoreductase 1, and heme oxygenase-1), which facilitate the metabolism, neutralization, and clearance of xenobiotics and oxidative stressors.

1:05:35Rhonda Patrick (host)supportedmoderate

PFAS chemicals accumulate in human organs including the liver and kidneys.

"unlike BPA or phthalates, the PFAS have a half-life of 2 to 5 years, meaning they accumulate in our organs like the liver and the kidneys, and their persistence in the body makes them much harder to eliminate." (said at 1:05:35)

Human pharmacokinetic and tissue distribution studies confirm that major per- and polyfluoroalkyl substances (PFAS) such as PFOS, PFOA, and PFHxS have human elimination half-lives typically spanning 2 to 5+ years (e.g., approximately 2.7 to 3.8 years for PFOA and 3.4 to 5.4 years for PFOS). Autopsy and tissue monitoring studies show that PFAS distribute into and accumulate in internal organs, with the liver and kidneys identified as primary target organs of retention.

Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.