A randomized Australian trial involving more than 200 adults found that reducing routine contact with plastic for just seven days was associated with substantial declines in several bisphenols and phthalates commonly linked to food packaging, kitchen products and personal care items.
By yourNEWS Media Newsroom
A one-week effort to reduce everyday plastic exposure was associated with rapid declines in several hormone-disrupting chemicals in the human body, according to a randomized Australian trial that measured plastic-associated compounds before and after participants changed how they purchased, prepared and stored food.
The Plastic Exposure Reduction Transforms Health, or PERTH, trial involved more than 200 adults and found measurable concentrations of phthalates and bisphenols in every participant at baseline. After participants spent seven days using lower-plastic alternatives while maintaining the same caloric intake, researchers recorded declines of more than 40% in certain phthalates and reductions exceeding 50% in some bisphenols, including BPA and BPS, among some intervention groups.
The research, led by scientists at the University of Western Australia and published in Nature Medicine, examined whether practical reductions in plastic contact could meaningfully change internal chemical exposure over a relatively short period. The findings were also reported Sept. 19, 2026, by mindbodygreen.
Rather than requiring participants to eliminate plastic from their lives, researchers focused on frequently repeated sources of exposure, particularly those associated with food production, packaging, storage and preparation. The results suggested that changing those routine exposures can alter measurable chemical levels within days.
“The participants didn’t eliminate plastic entirely,” the article stated. “They just reduced the most consistent sources.”
Study Design and Widespread Baseline Exposure
Researchers first measured urinary concentrations of plastic-associated chemicals in an observational group of 211 adults. Every participant had detectable levels of at least six such chemicals, underscoring how widespread exposure has become.
Phthalates and bisphenols are used in or associated with numerous consumer products, including food packaging, plastic kitchenware and personal care products. Because many of the compounds have comparatively short biological half-lives, the body can eliminate them relatively quickly while simultaneously accumulating additional amounts through repeated daily exposure.
That cycle made a seven-day intervention useful for testing whether reducing incoming exposure would be reflected in urine measurements over a short period.
Participants were assigned to routines intended to reduce plastic contact without changing the number of calories they consumed. Food was selected with an emphasis on limiting plastic exposure from production through final packaging, and participants also made changes involving kitchen utensils, food storage and, in some cases, personal care products.
The intervention therefore differed from a conventional diet study. Researchers were not primarily testing whether eating fewer calories, changing macronutrients or following a particular eating pattern altered chemical exposure. Instead, they examined what happened when participants continued eating normally while reducing opportunities for food and other products to come into contact with plastic.
Chemical Levels Fall Within Days
The most pronounced changes emerged after only one week. Some phthalate measurements declined by more than 40%, while BPA, BPS and other bisphenol measurements fell by more than 50% in some groups.
Food appeared to be one of the most consequential pathways. Participants whose food had less contact with plastic across sourcing, packaging, preparation and storage experienced some of the largest reductions, suggesting exposure may accumulate through multiple points along the food chain rather than through a single container or kitchen product.
Highly processed and heavily packaged foods were associated with greater exposure. Even produce could contribute differently depending on how it was packaged or stored, with fruits and vegetables wrapped or kept in plastic showing higher associated chemical exposure than comparable foods handled with less plastic contact.
The findings also raised questions about relying solely on products marketed as “BPA-free.” Replacing BPA with chemically related substitutes such as BPS does not necessarily eliminate concerns about bisphenol exposure, according to the report, because substitute compounds may have similar biological activity.
Researchers therefore emphasized reducing overall exposure rather than simply exchanging one bisphenol-containing product for another.
The findings add to longstanding research examining possible health effects associated with phthalates, bisphenols and other chemicals used in consumer materials.
One study reported in 2023 found an association between phthalate exposure and a more than 60% increased risk of developing diabetes among women, according to NaturalNews.com. Phthalates are found in numerous consumer and personal care products, including shampoos, soaps and products containing fragrance.
Separate research involving approximately 1,500 men also detected phthalates in nearly all urine samples examined and reported associations between higher exposure and several chronic health conditions. The work was conducted by researchers affiliated with the South Australian Health and Medical Research Institute and the University of Adelaide.
Reducing Plastic Contact in Everyday Life
The PERTH intervention concentrated on changes people could make without fundamentally reorganizing their lives. Participants selected food with less packaging, avoided canned products when practical, transferred leftovers to glass containers, stopped heating food in plastic and substituted some personal care products, including using bar soap instead of body wash.
Personal care changes accounted for a smaller portion of the intervention than food-related changes but were still associated with measurable reductions in some phthalates.
Because exposure happens repeatedly, researchers indicated that small changes made consistently may have a cumulative effect. A person who avoids heating meals in plastic, for example, is eliminating an exposure opportunity every time that meal-preparation habit would otherwise occur.
Existing recommendations for limiting phthalate exposure have taken a similar approach. Mercola.com has advised consumers to avoid products listing “fragrance” as an ingredient when possible because the broad term can encompass formulations containing phthalates that help stabilize scents and extend their duration.
Other recommendations include avoiding microwave heating in plastic containers or beneath plastic wrap and reducing household dust that may contain chemicals released from vinyl flooring, blinds, wallpaper, furniture and other synthetic materials.
Kitchen equipment represents another potential exposure point. Scratched or heavily worn nonstick cookware can shed microscopic particles into food, while deteriorating plastic cooking tools may release more contaminants as their surfaces break down. Replacing worn cookware and utensils with materials such as stainless steel can eliminate plastic contact from those particular sources.
The trial did not demonstrate that participants could completely remove plastic-associated chemicals from their bodies, nor did it establish that a seven-day reduction in measured exposure produces specific long-term health outcomes. Instead, it demonstrated that internal levels of several commonly encountered chemicals could change substantially and quickly when routine exposure was reduced.
That distinction is important because the intervention measured chemical exposure rather than disease prevention. Longer-term research would be needed to determine whether maintaining lower exposure produces measurable changes in rates of endocrine, metabolic, reproductive or other health conditions.
Still, the rapid shifts observed during the PERTH trial suggest that exposure is not necessarily fixed. For chemicals that are cleared relatively quickly from the body, daily choices affecting food packaging, storage, preparation and personal care can influence how much is continuously reintroduced.
The strongest lesson from the seven-day experiment was not that participants had to eliminate every plastic product around them. Instead, the largest reductions followed a broader decrease in repeated contact with plastic, particularly where food was concerned — indicating that cumulative everyday exposure may be a more important target than replacing any single bottle, container or household item.
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