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Diet-dependent effects of an environmentally relevant dose of polyethylene and polyethylene terephthalate on white adipose tissue and systemic insulin resistance in mice
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Mice exposed to realistic amounts of common plastic particles (from plastic bottles and packaging) developed health problems no matter what they ate, those on a healthy diet lost fat tissue in an unhealthy way, while those on a high-fat diet became more resistant to insulin, a warning sign for diabetes. This suggests that simply eating well may not be enough to protect us from the effects of everyday plastic exposure, highlighting why reducing plastic pollution at the source matters for public health.
As human exposure to micro- and nanoplastics (NPs) is unavoidable, it remains unclear whether dietary composition can modulate their health impacts. To address this, we investigated the metabolic effects of two common yet understudied polymers, polyethylene (PE) and polyethylene terephthalate (PET), in mice with either healthy or energy-dense diet. C57BL/6 J male mice were exposed to an environmentally relevant dose of PE or PET (100 nm, 25 mg/kg BW/day) for 29 weeks under either a normal diet (ND) or a high-fat diet (HFD). The metabolic consequence of NP exposure was highly diet-dependent. In ND-fed mice, PE and PET reduced white adipose tissue (WAT) mass, with PET inducing metabolic changes that toward a lipodystrophy-like state. Conversely, in HFD-fed mice, both polymers impaired systemic insulin sensitivity. Regardless of diet, PE and PET promoted immunoglobin G (IgG) accumulation in epididymal WAT, with PE-exposed lean mice exhibited the most robust IgG elevation, WAT fibrosis and impaired adipogenesis. These findings demonstrate that chronic, environmentally relevant PE or PET exposure disrupts metabolic health in male mice under both dietary contexts. While dietary composition dictates the specific metabolic phenotype, it does not prevent adverse outcomes. This complicates lifestyle-based mitigation strategies and underscores the urgent need for environmental source controls.
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Oral Exposure to Polystyrene Microplastics of Mice on a Normal or High-Fat Diet and Intestinal and Metabolic Outcomes
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Researchers found that polystyrene microplastics caused metabolic problems like diabetes and fatty liver disease in mice, but only when combined with a high-fat diet. The high-fat diet appeared to damage the gut lining enough to allow microplastics to deposit in the intestinal wall, triggering inflammation that altered nutrient absorption. This suggests that people with poor diets may be more vulnerable to the harmful effects of microplastic exposure.
High-fat diet primes vulnerability to polyethylene terephthalate nanoplastic toxicity via the gut microbiota-metabolism axis
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Mice on a high-fat diet suffered much more gut damage from plastic nanoparticles (the kind found in food packaging) than mice on a normal diet, including a leakier gut lining, more inflammation, and disrupted gut bacteria. This suggests that eating a high-fat diet may make your gut more vulnerable to the harmful effects of the tiny plastic particles we're increasingly exposed to through food and water, meaning diet and plastic exposure together could pose a bigger health risk than either one alone.
Metabolic footprint of microplastics and nanoplastics: From environmental exposure to metabolic diseases
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Tiny plastic particles that get into our bodies through food, water, and air may be quietly messing with how our cells produce energy, process fat, and respond to insulin—potentially raising the risk of obesity, type 2 diabetes, and fatty liver disease. This review pulls together existing research to explain how these particles disrupt gut bacteria and cell function, with smaller plastic pieces generally causing more harm. While more research is needed to confirm long-term effects in humans, the findings suggest reducing plastic exposure where possible may be a smart precaution for metabolic health.
Oral exposure to polyethylene microplastics of adult male mice fed a normal or western-style diet: impact on gut and gut-liver axis homeostasis
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Researchers orally exposed adult male mice to polyethylene microplastics under both normal and high-fat diets, assessing effects on the gastrointestinal tract. The study found that diet influences microplastic-induced gut changes, with greater effects observed in animals fed a western-style high-fat diet.
A Western-style diet shapes the gut and liver responses to low-dose, fit-for-purpose polystyrene nanoplastics in mice
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A subchronic mouse study found that low-dose polystyrene nanoplastics designed to mimic real-world particle characteristics impaired gut and liver health in a non-monotonic, diet-dependent manner, with Western-style diet amplifying the effects.
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