Plastic has become almost impossible to avoid in everyday life, but new research suggests that changing how food is produced, packaged and prepared can quickly reduce exposure to key plastic-related chemicals. A randomized controlled trial in Australia found that targeted lifestyle changes produced measurable differences within just days.
The study, published in Nature Medicine, followed 60 adults assigned to different seven-day interventions designed to reduce contact with plastics. Researchers focused on two widely used groups of plastic-associated chemicals, phthalates and bisphenols, which previous research has linked to potential hormone disruption and long-term health risks.
How the plastic exposure trial worked
Before beginning the intervention, researchers assessed everyday exposure among 211 volunteers. Every participant excreted at least six different metabolites from plastic-associated chemicals on any given day, highlighting how widespread exposure to these substances has become.
Participants with the lowest baseline levels tended to avoid fast food, heavily processed products, plastic-packaged meals and microwaving food in plastic containers. These patterns suggested that diet and food-handling practices could be important ways to reduce exposure.
To test this directly, 60 participants were randomly assigned to a control group or one of four intervention groups. The interventions involved eating foods with minimal plastic contact, avoiding plastic cooking and serving equipment, changing personal care products, or combining all three approaches for one week.
Sharp drop in key chemical markers
The researchers worked with more than 100 farmers and food producers to modify food handling and packaging, replacing plastic where possible with materials such as glass, stainless steel and wood. Participants could still eat familiar foods, including pasta, salads, meat, dairy products, chocolate, fruit and snacks, while keeping their calorie intake stable.
Urine tests showed that interventions involving low-plastic food and plastic-free kitchenware produced the largest reductions in certain chemicals. Compared with the control group, mono-n-butyl phthalate fell by 38%, monobenzyl phthalate by 54% and bisphenol A by 60% among participants who combined low-plastic food with plastic-free cooking equipment.
In contrast, changing only personal care products, including shampoos and cosmetics, produced smaller changes in the plastic-associated chemicals measured. The results suggest that, at least for phthalates and bisphenols, food and food preparation may represent major sources of exposure for many people.
What the findings mean for health
Phthalates are used as plasticizers to make materials flexible and are commonly found in food packaging, plates and utensils. Bisphenols such as BPA and BPS can be found in the linings of cans, some food containers, drink bottles and thermal papers. Both groups of chemicals can migrate into foods and beverages after contact with plastic surfaces.
These substances generally have short half-lives in the body and are cleared within hours or days, which may explain why levels declined rapidly when exposure was reduced. However, because people encounter them so frequently, even short-lived chemicals can result in repeated, low-level internal exposure over many years.
Large observational studies have associated higher levels of phthalates and bisphenols with conditions including cardiovascular disease, metabolic syndrome and reduced fertility, although direct causal relationships remain under investigation. Regulators in regions including the European Union have already restricted BPA and some phthalates in certain food-contact materials and children’s products.
Can individuals meaningfully reduce exposure?
The Australian trial suggests that individuals can reduce their exposure to some plastic-associated chemicals by changing what they buy and how they prepare food. Choosing fresh or minimally processed foods, selecting products packaged in glass or paper rather than plastic, and using stainless steel, glass or cast iron cookware can all reduce points of plastic contact.
However, the researchers emphasize that these changes may not be equally practical for everyone. Access to fresh foods, the time required for home cooking and the potentially higher cost of alternative packaging can make such strategies difficult without broader changes in food production and retail systems.
The authors also note that the trial was relatively short and measured biochemical markers rather than health outcomes. Further research is underway to determine whether sustained reductions in phthalates and bisphenols translate into measurable benefits for conditions such as cardiovascular disease, obesity or reproductive health.
Rising plastic use and future risks
More than 16,000 chemicals are used globally in plastic manufacturing, while overall plastic production continues to increase. Many of these substances have not been fully evaluated for long-term safety, raising questions about their cumulative effects on human health and ecosystems.
At the same time, microplastics and nanoplastics are increasingly being detected in drinking water, food, air and human tissues. Although the Australian trial did not directly measure microplastics, the findings add to evidence that reducing plastic contact throughout the food chain can lower exposure to at least some plastic-associated chemicals.
The study’s authors describe the results as a message of cautious optimism. Plastic remains deeply embedded in modern supply chains, but targeted changes in how food is produced, packaged and prepared may quickly reduce some of the chemicals that accompany it into the body, even as their full health implications continue to be investigated.
