Plastic-Free Eating Pays Off Fast
Plastic has become an unavoidable part of modern life, from food packaging and kitchenware to personal care products. Along with it come plastic-associated chemicals (PACs), including phthalates and bisphenols such as bisphenol A (BPA), which have been linked in previous research to hormone disruption and other health concerns.
Now, a randomized controlled trial from researchers at the University of Western Australia suggests that reducing contact with plastics—even for just seven days—can substantially lower the body's exposure to several of these chemicals. The findings point to food packaging and processing as some of the most important sources of everyday exposure.
Key Data
A cohort of 211 Australian adults participated in the observational portion of the Plastic Exposure Reduction Transforms Health (PERTH) Trial, while 60 participants took part in the randomized controlled intervention.
The intervention lasted just seven days, demonstrating that measurable reductions in several plastic-associated chemicals can occur within one week of lowering plastic exposure.
Researchers sourced food from more than 100 producers that minimized plastic contact in production, packaging, and delivery.
Participants receiving low-plastic food plus plastic-free kitchenware reduced urinary mono-n-butyl phthalate (MnBP) by 37.5% compared with the control group.
The same intervention reduced monobenzyl phthalate (MBzP) by 53.5%.
BPA levels fell by 59.7% after only one week in the low-plastic food and kitchenware group.
Participants who received all three interventions—low-plastic food, kitchenware, and personal care products—experienced the largest reduction in MnBP, with levels falling 44.1%.
Combining all groups that received low-plastic food resulted in average reductions of:
37.9% in MnBP
44.5% in MBzP
51.6% in BPA
47.3% in total urinary bisphenols
Even without dietary changes, replacing conventional personal care products with low-plastic alternatives reduced MnBP by 35.3%.
Sources:
Nature Medicine. Low-plastic diet and urinary levels of plastic-associated phthalates and bisphenols: the randomized controlled PERTH Trial. https://www.nature.com/articles/s41591-026-04324-7
University of Western Australia Research Repository. Low-plastic diet and urinary levels of plastic-associated phthalates and bisphenols: the randomized controlled PERTH Trial. https://research-repository.uwa.edu.au/en/publications/low-plastic-diet-and-urinary-levels-of-plastic-associated-phthala/
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