Are Your Vegetables Safe?
By McGill University
A sweeping international analysis is raising new concerns about what may be quietly entering our food supply. Scientists report that crops can absorb “contaminants of emerging concern” (CECs), a broad group of modern pollutants that includes pharmaceuticals, microplastics, engineered nanomaterials, and PFAS (commonly known as “forever chemicals”).
Even in trace amounts, these substances can interfere with
plant growth, reshape soil ecosystems, and potentially move into the human
diet.
Unlike traditional pollutants, many CECs are not routinely
monitored or regulated in agriculture. Yet the study shows they can enter
farmland through unexpected routes, including recycled wastewater, treated
sewage sludge, manure, and plastic-based farming materials. Some of these
practices are widely promoted as sustainable solutions, which raises a
difficult question about hidden trade-offs in modern agriculture.
“What’s new here is the holistic perspective: we bring together evidence across chemical classes, environmental pathways, plant uptake mechanisms and societal impacts,” said Audrey Moores, co-author of the meta-study and Professor of Chemistry at McGill.
“This review highlights major knowledge gaps, including the
effects of chemical mixtures, long-term accumulation and sublethal impacts not
captured by standard toxicity tests,” she said. “Crucially, we show that
reducing contamination at its source, through smarter chemical design and
sustainable production, is essential, alongside improved regulation and
monitoring.”
Overlooked issues identified
The review was led by Laura J. Carter of the University of
Leeds and involved researchers from the United Kingdom, Israel, China, the
United States, and Canada.
To reach their conclusions, the team analyzed hundreds of
lab, greenhouse, and field studies. They compared how different types of CECs
move through soil and plant tissues, how environmental factors influence
exposure, and how these substances build up in edible crops under realistic
conditions.
The findings show that CECs reach soil and crops through
several pathways that are often underestimated. These include practices such as
wastewater irrigation, the use of biosolids and manure, and agroplastics. Many
of these methods are intended to support more sustainable agriculture but may
unintentionally introduce contaminants.
After entering plants, CECs can travel through internal
vascular systems and accumulate in leaves, fruits, and roots.
The researchers found that many of these chemicals remain
biologically active even in trace amounts. They can affect plant hormone
systems, microbial communities, and nutrient cycling in soil.
CECs may also contribute to antimicrobial resistance,
disrupt plant biochemical processes, and alter soil structure. These effects
can ultimately influence crop yields and food quality. Persistent substances
such as PFAS are especially likely to accumulate in leaf tissues.
The review also points to several underexplored areas.
Interactions between multiple contaminants may increase or reduce toxicity, but
these combined effects are not well understood. Some exposure routes, such as
absorption through leaves (“foliar exposure”), remain poorly studied. In
addition, there are uneven global data gaps when it comes to risks for specific
crops.
Next steps
The authors call for updated regulations that better reflect
real-world conditions, including the effects of chemical mixtures and the role
of CECs in antimicrobial resistance. They also recommend long-term field
studies, broader geographic representation in research, and the development of
safer, degradable alternatives for use in agriculture and industry.
Moores emphasized that the findings align with green
chemistry principles, which focus on designing substances that break down into
harmless byproducts rather than persisting in the environment.
“Safer chemicals can only be produced by having a design
approach where we are thinking about end-of-life from the onset. Preventing
pollution is far more effective than trying to clean it up later. Participating
in this study was important to me as it illustrated with real-life examples the
need for chemicals and materials design and discoveries to be better aligned
with the realities of their applications and afterlife,” she said.
Reference: “Contaminants of emerging concern in agricultural
soils: Current understanding, overlooked issues, and future priorities” by
Laura J. Carter, Evyatar Ben Mordechay, Benny Chefetz, Zeyou Chen, Xinyi Cui,
Jay Gan, Hui Li, Audrey Moores and Xiaoyu Gao, 21 January 2026, Plants,
People, Planet.
DOI: 10.1002/ppp3.70158
The research was funded by a United Kingdom Research and
Innovation Future Leaders Fellowship and the Nanjing University International
Collaboration Initiative.
