Pressure on plastic food packaging is intensifying after two new pieces of research added to growing concerns about the health effects of micro- and nanoplastics released from food-contact materials. The findings, highlighted by Nutrition Insight, are likely to sharpen debate across the packaging industry, where safety discussions have traditionally focused on chemical migration but are now expanding to include particle release as a separate and potentially significant exposure route.

A report from Earth Action estimates that around 1,000 metric tons of microplastics from food packaging enter food and drinks each year. While packaging is not the largest overall source of microplastic pollution, the organisation argues that its direct contact with food creates a particularly concentrated pathway for human ingestion. Because these particles are so small, they can pass biological barriers and interact with cells and tissues in ways that are still being investigated. Earth Action also stresses that plastics are not only a source of particles, but of complex chemical mixtures that may include endocrine disruptors and carcinogenic substances.

That dual exposure is central to the report’s warning. According to Earth Action, every 100 to 200 milligrams of microplastics may carry roughly 50 milligrams of associated chemical exposure.

The concern is no longer limited to what migrates chemically from packaging into food, but to the combined burden of particles and chemicals released from the same material during normal use.

A second study, published in Nature Reviews Gastroenterology & Hepatology, adds a more direct health angle by linking micro- and nanoplastics to processes associated with liver disease. The review points to evidence that plastic particles may trigger oxidative stress, inflammation and fibrogenesis in animals, while also acting as carriers for harmful substances including microbial pathogens, endocrine-disrupting chemicals and carcinogenic additives. Researchers note that the liver is one of the body’s main processing and detoxification organs, making it especially exposed to substances that enter through the digestive system.

For the packaging sector, the significance of these studies lies not only in the toxicology questions they raise, but in the way they challenge long-standing assumptions about material stability. Food packaging has often been treated as functionally inert once approved for contact use. That position is becoming harder to defend as research increasingly suggests that plastics may release both chemicals and microscopic particles under ordinary conditions. In practical terms, this could widen the scope of future packaging assessments, pushing regulators to look beyond migration limits and into the physical integrity of materials over time.

The issue also arrives at a moment when packaging regulation is already under pressure from sustainability demands, circularity targets and public concern over plastic waste. If particle release becomes a recognised safety issue, it may accelerate interest in alternative materials, redesigned barrier systems and more detailed testing protocols for plastic packaging. It could also reshape how brands communicate packaging safety, especially in categories where consumer trust is closely tied to health and wellbeing.

None of this means that plastic food packaging is about to disappear from the market. Performance, cost, sealing efficiency and shelf-life protection still make plastics difficult to replace in many applications. But the direction of travel is becoming clearer. As evidence grows around microplastic exposure and its possible biological effects, the industry may face increasing pressure to prove not just that packaging is functional and compliant, but that it remains safe in a broader and more modern sense. For packagers, converters and food brands, that would mark a meaningful shift in how plastic packaging is judged in the years ahead.