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
4 Overstated
A 2022 study analyzing lung tissue from surgical patients detected microplastics in 100% of the samples.
"There was a study published in 2022 that examined lung tissues from surgical patients and found microplastics in every single sample. And what's striking is that these patients had no significant environmental exposures beyond just daily life." (said at 0:12:18)
The referenced 2022 study by Jenner et al. examined lung tissue samples collected from 13 surgical patients using μFTIR spectroscopy. While microplastics were detected in the majority of patients, they were found in 11 of the 13 samples (~85%), not in 100% or 'every single sample'.
Humans consume approximately the equivalent of an entire credit card in plastic every week.
"Every week, without even realizing it, we are consuming the equivalent of an entire credit card in plastic." (said at 0:00:00)
The popular claim that humans consume the equivalent of a credit card (~5 grams) of plastic per week originates from modeling studies estimating global microplastic intake. A pivotal study synthesizing data across 59 publications estimated that humans ingest between 0.1 and 5 grams of microplastics per week across various pathways. Stating that people consume an entire credit card weekly treats the upper extreme of a wide 50-fold theoretical range (0.1–5 g) as a definitive figure. Furthermore, these figures rely on indirect mathematical modeling and conservative assumptions rather than direct physiological measurements.
In a study of women undergoing IVF, those with higher urinary BPA levels had half as many viable eggs as women with lower BPA levels.
"So there's a study that looked at women going through IVF, and what was found was kind of shocking: women with higher levels of BPA in their urine had half as many viable eggs as women with lower BPA levels." (said at 0:36:20)
Prospective cohort studies of women undergoing IVF (such as the EARTH study cohort) have observed inverse associations between urinary BPA concentrations and the number of retrieved or normally fertilized oocytes, but the magnitude of the effect is substantially overstated by claiming a 50% reduction ('half as many viable eggs'). In the primary prospective cohort evaluating these outcomes (Ehrlich et al., 2012), comparing the highest quartile of urinary BPA to the lowest quartile was associated with a 24% decrease in total oocytes retrieved and a 27% decrease in normally fertilized oocytes, not a 50% decrease. Furthermore, subsequent larger analyses from the same cohort (Mínguez-Alarcón et al., 2015) found no statistically significant overall association between urinary BPA and fertilization rates, embryo quality, or live birth rates.
- partial: Urinary bisphenol A concentrations and early reproductive health outcomes among women unde… (Human reproduction (Oxford, England) 2012) · cited 246x in the literature
"The mean number of oocytes and normally fertilized oocytes decreased by 24 and 27%, respectively, for the highest versus the lowest quartile of urinary BPA (trend test P < 0.001 and 0.002, respectively)." (abstract, results, passage verified)
pubmedfull study (doi) - context: Urinary bisphenol A concentrations and association with in vitro fertilization outcomes am… (Human reproduction (Oxford, England) 2015) · cited 86x in the literature
"Urinary BPA concentrations were not associated with endometrial wall thickness, peak estradiol levels, proportion of high quality embryos or fertilization rates. Furthermore, there were no associations between urinary BPA concentrations and implantation, clinical pregnancy or live birth rates per initiated cycle or per embryo transfer." (abstract, results, passage verified)
pubmedfull study (doi)
Microplastics in semen, particularly PVC particles, were linked to abnormal sperm shape and impaired motility.
"These microplastics were linked to abnormal sperm shape and impaired motility, meaning their sperm couldn't move as efficiently. And one of the worst culprits was PVC." (said at 0:40:05)
A 2024 cross-sectional study of 40 men (PMID 38802004) detected microplastics in all seminal fluid samples and found that semen containing polyvinyl chloride (PVC) had significantly lower progressive sperm motility compared to samples containing polystyrene (19.04% vs. 43.52%). However, the same study noted that sperm morphological abnormalities were not significantly associated with specific microplastic polymer types. Furthermore, the evidence base is preliminary, consisting of small observational cohorts that show statistical associations rather than proven causal mechanisms.
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.