Most people think of plastic as a packaging problem – something to recycle, reduce, or feel guilty about at the checkout line. But a landmark clinical trial published in April 2026 has reframed the conversation in a way that demands attention. The chemicals that leach from plastic into your food, your kitchenware, and your personal care products aren’t just sitting on the surface of what you eat. They’re inside your body right now, measurable in your urine, and detectable in your blood. Every single one of us is carrying them.
What makes the new research so striking isn’t the fact of chemical exposure – that’s been documented for years. It’s the speed at which things can change. A carefully designed intervention showed that it’s possible to substantially reduce the burden of plastic-associated chemicals in the human body in a matter of days. Not months, not years. Seven days.
That finding doesn’t just tell us something about the chemicals. It tells us something about where they’re coming from. If exposure drops that sharply when you change your diet and swap out your kitchenware, then food and food packaging aren’t a minor contributor to your chemical load – they’re a dominant one. Here is what the science actually shows, why researchers believe the health stakes are significant, and what any individual can realistically do about it.
The PERTH Trial: What Researchers Actually Did
Researchers at the University of Western Australia conducted the Plastic Exposure Reduction Transforms Health (PERTH) Trial, spending three years measuring exposure to plastic chemicals in adults across Perth, Western Australia. The results were published in April 2026 in Nature Medicine.
The study had two components. It included an observational cohort of 211 Australian participants and a 7-day pilot randomized controlled trial (RCT) in 60 participants. In the observational phase, researchers tracked participants’ existing diets and lifestyles and measured the plastic-associated chemicals in their urine. Then, in the RCT phase, a subset of those participants received a structured intervention.
Intervention groups received combinations of plastic-free kitchenware, low-plastic personal-care products, and food sourced from more than 100 producers that minimized all plastic touchpoints from farm to plate, while the control group received no intervention. The food supply was not restricted in terms of what participants could eat. Participants had access to any type of food they would usually consume – pasta, salads, meats, butter, chocolate, fruit, and snacks – which allowed energy intake to remain the same.
The operational effort behind this was considerable. The research team went to great lengths to ensure that plastic and other sources of plastic chemicals, including silicones and cans, were removed from the food supply chain. Dietitians worked with over 100 farmers and food producers to educate and transform their food handling processes and packaging to reduce plastic exposure from paddock to plate.
The Results
At the end of the seven-day intervention, all trial groups showed a decrease in urinary plastic chemical levels compared to the control group. The scale of those decreases was notable. Phthalates decreased by more than 44% and bisphenols – including BPA and BPS – by more than 50%.
Researchers also found that 100% of participants showed high levels of plastic chemicals in their bodies at baseline, with each participant recording at least six different chemical types on any given day. The universality of exposure was not a surprise to researchers, but having it documented in a clinical cohort – with every single participant affected – underscores how pervasive contamination has become.
In the cohort phase, highly processed, plastic-packaged, and canned foods were identified as important modifiable factors for urinary plastic-associated chemical levels. That finding matters for how individuals prioritize change. It points to ultra-processed and packaged foods as the most impactful targets, not just the obvious plastic water bottle.
What Phthalates and Bisphenols Actually Are – and Why They Matter
To understand why these reductions are medically relevant, it helps to know what these chemicals do inside the body.
Endocrine disruptors are natural or man-made chemicals that may mimic or interfere with the body’s hormones, known as the endocrine system. These chemicals are linked to many health problems in both wildlife and people, according to the National Institute of Environmental Health Sciences. The human body depends on hormones for a healthy endocrine system, which controls many biological processes including normal growth, fertility, and reproduction. Hormones act in extremely small amounts, and minor disruptions in those levels may cause significant developmental and biological effects.
Phthalates are chemical additives widely used to produce flexibility and reduce brittleness in plastics. They appear in PVC consumer, medical, and building products; as matrices and solvents in personal care products; and as fillers in medications, dietary supplements, food and beverage packaging, and children’s toys, according to the Endocrine Society. Bisphenols such as BPA are used as chemical building blocks in polycarbonate plastics and epoxy resins and are present in reusable food and beverage containers, reusable water bottles, the linings of food cans, medical and sports equipment, eyeglass lenses, thermal paper receipts, and plastic water pipes.
BPA, a common plasticizer and resin component, mimics estrogen and disrupts thyroid hormone metabolism, contributing to obesity, diabetes, and cardiovascular issues. BPS, which is BPA’s most common replacement, exhibits similar endocrine-disrupting properties and persists longer in the environment. This is a critical regulatory problem: the widespread consumer shift away from BPA toward BPS has not removed the risk. Researchers on the PERTH Trial stated that the high prevalence of BPS in healthy participants, as an alternate chemical used to replace BPA, should raise serious concerns for food standards regulators, as it is becoming clear that these replacements are likely to cause similar harms.
Phthalates can be found in most products that come into contact with plastics during production, packaging, or delivery. Despite their short half-lives in tissues, chronic exposure adversely influences the endocrine system and multiple organs, with long-term negative impacts on reproductive outcomes, child growth and development, and reproductive systems in both children and adolescents.
The Cardiovascular Dimension
The health consequences of plastic chemical exposure extend well beyond hormonal disruption. A growing body of research is pointing directly at the heart.
Synthetic chemicals called phthalates, found in consumer products such as food storage containers, shampoo, makeup, perfume, and children’s toys, may have contributed to more than 10% of all global mortality from heart disease in 2018 among men and women aged 55 through 64, according to research from NYU Langone Health. That 2025 study, published in eBioMedicine00174-4/fulltext), focused specifically on one phthalate – DEHP (di-2-ethylhexyl phthalate). According to the study’s senior author, Dr. Leonardo Trasande, a professor at New York University’s Grossman School of Medicine, “phthalates contribute to inflammation and systemic inflammation in the coronary arteries, which can accelerate existing disease and lead to acute events including mortality.”
In the PERTH Trial’s cohort study, researchers also observed associations between cardiometabolic biomarkers and higher urinary di(2-ethylhexyl) phthalate metabolites, adding a direct, human clinical dimension to the broader epidemiological picture.
The cardiovascular risk from plastic chemicals also has a physical component separate from chemical disruption. A 2024 study published in The New England Journal of Medicine found that in a study of more than 200 people undergoing surgery, nearly 60% had microplastics or even smaller nanoplastics in a major artery. Those who did were 4.5 times more likely to experience a heart attack, a stroke, or death in the approximately 34 months following surgery compared to those whose arteries were plastic-free.
Growing evidence now suggests that human exposure to certain endocrine-disrupting chemicals may increase the risk of obesity, type 2 diabetes, and cardiovascular disease, according to a 2025 review published in Cardiovascular Diabetology. Key findings across the reviewed literature indicate that EDC exposures are consistently associated with elevated risks of cardiometabolic conditions, and that prenatal and early-life EDC exposures appear to increase susceptibility to obesity, impaired glucose metabolism, and cardiovascular dysfunction later in life.
Fertility, Reproduction, and the Broader Burden
The effects of plastic-associated chemicals on reproductive health have accumulated into a substantial body of evidence. These chemicals mimic or antagonize natural hormones, disrupt steroidogenesis (the production of steroid hormones), impair the regulation of the hypothalamic-pituitary-gonadal axis, and interfere with androgen and estrogen receptors, leading to reduced testosterone production, altered sperm parameters, and increased sperm DNA damage.
Phthalates and BPA have been strongly linked to anti-androgenic effects and poor semen quality, according to a 2025 systematic review published in PMC that examined 14 observational studies on endocrine-disrupting chemical exposure and fertility outcomes. Researchers analyzing a large, diverse sample of births in the United States found that exposure to certain phthalates was associated with decreased gestational age and increased risk of preterm birth, findings highlighted by the NIEHS.
Fertility research is the next frontier for the PERTH team directly. The next PERTH Trial study will investigate the effects of plastic chemical exposure on fertility, following up on the chemical-reduction results from the current trial.
For readers concerned about how plastic chemicals accumulate in the body through everyday products like bottled water, the PERTH Trial’s findings offer a concrete reason to act: the body clears these chemicals relatively quickly once exposure stops, which means behavioral changes produce measurable results.
Where the Exposure Is Actually Coming From
The PERTH Trial didn’t just measure reductions – it also identified the primary sources driving chemical load in the observational phase. By assessing people’s exposure to plastics in their diet, environment, and lifestyle while measuring plastic chemical levels in their urine, the research team identified that highly processed, packaged, and canned foods and beverages were significant contributors.
This aligns with what researchers have found more broadly. One analysis of 312 foods tested from grocery stores and restaurants found that 86% contained either phthalates or bisphenols, including baby formula and sourdough bread. Some of the highest concentrations appeared in highly processed foods. A 2025 review in the Washington Post of food chemical research noted that pregnant women who ate 10% more calories from ultra-processed foods had 13% higher levels of DEHP in their urine.
Plasticizers – chemicals added to plastic to make them soft, flexible, and easier to handle – can migrate into food from packaging, especially when exposed to heat, such as when microwaving food in plastic containers or leaving bottled water in a hot car. Fatty foods such as cheese and meat absorb these chemicals at a higher rate. This detail matters in practice: heating, fat content, and extended contact time all amplify how much of these chemicals reach the food you eat.
Scientists have catalogued more than 16,000 plastic chemicals, and more than a quarter of them are considered to be of concern, according to a systematic overview published by the Food Packaging Forum. Regulatory frameworks have not kept pace with that reality. Manufacturers have largely moved away from lining cans with BPA within the last five to ten years, but many keep their replacement chemicals confidential. This means that neither the FDA, academic scientists, nor watchdog organizations can examine the science of these substitutes or assess their safety, according to Breast Cancer Prevention Partners.
Study Limitations and What Remains Unknown
The PERTH Trial is a rigorous piece of science, but its limitations deserve acknowledgment. The pilot RCT enrolled 60 participants – a small sample by clinical trial standards. The trial lasted just seven days, which was long enough to demonstrate chemical reduction but not to establish whether those reductions produce measurable health improvements. The principal investigator, Professor Michaela Lucas, stated publicly that researchers do not yet know what a “safe” level of plastic in the body might be, and that more research was needed. “We do know that plastic chemicals are harmful to humans, and the health burden has and will increase over time unless we intervene.”
The study population was drawn from Western Australia, which may limit generalizability to different dietary environments and food systems. And the intervention required an extraordinary degree of coordination, working with over 100 food producers to eliminate plastic from the supply chain, which is not replicable at the individual level without institutional support.
A companion commentary published alongside the trial in Nature Medicine noted that extensively limiting plastic use in food systems, diet, and daily life can reduce exposure to plastic-associated chemicals, but indicated that large-scale regulatory action would be needed for true public health impact.
Read More: 6 Steps You Can Take to Minimize Microplastics in Your Body
Key Takeaways
The PERTH Trial delivers one finding that has profound practical implications: the human body begins to clear plastic-associated chemicals quickly once the source of exposure is reduced. The chemicals are not permanently locked in. That is the message of hope in otherwise sobering data.
For the individual, the most actionable conclusion from the observational phase is to target ultra-processed and canned foods first. These were consistently identified as significant contributors to urinary chemical load. Switching to fresh, minimally packaged foods and cooking them in glass, stainless steel, or ceramic rather than plastic reduces exposure at multiple points simultaneously. Avoiding heating food in plastic is non-negotiable: heat can release more particles from plastic into food, according to UPMC HealthBeat. Store leftovers in glass jars. Replace plastic cutting boards with wood or glass. Filter drinking water and use a non-plastic bottle for daily use.
Personal care products are a secondary but meaningful source. The PERTH Trial’s intervention included low-plastic personal care products alongside food and kitchenware changes. Checking product labels for phthalates in fragrances and avoiding products that list “fragrance” without disclosing ingredients is a practical starting point.
Individually, these changes reduce exposure. But the evidence from the PERTH Trial also makes clear that individual action alone cannot solve a systemic problem. The study’s outcomes have the potential to significantly impact public health guidelines and inform regulatory policy on the use of chemicals in consumer products. The trial’s authors and funders are already using these findings to advocate for changes in how food packaging is regulated and how plastic chemicals are monitored at the population level. Until those regulatory changes materialize, the evidence strongly supports reducing plastic contact in food wherever you realistically can – beginning with what you put in the pan and what you use to cook it.
Disclaimer: This information is not intended to be a substitute for professional medical advice, diagnosis or treatment and is for information only. Always seek the advice of your physician or another qualified health provider with any questions about your medical condition and/or current medication. Do not disregard professional medical advice or delay seeking advice or treatment because of something you have read here.
AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.
Read More: Glass Bottles: Safer Alternative to Plastic or Unexpected Danger?