New research from Texas A&M University shows that lettuce plants exposed to nanoplastics and the toxic heavy metal cadmium absorb up to 61% more cadmium into their edible leaves than plants exposed to cadmium alone.
The study also found that nanoplastics accumulated in the edible leaf tissues at 67% higher concentrations when cadmium was also present. Researchers used a controlled hydroponic model to examine these interactions, raising questions about food safety in crops grown in contaminated environments.
What’s in your salad? 🥗
Texas A&M researchers discovered that lettuce exposed to nanoplastics absorbs far more cadmium, a harmful heavy metal, offering new insight into how emerging contaminants may affect food safety.
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— Texas A&M University (@TAMU) May 15, 2026
What Are Nanoplastics?
Nanoplastics are plastic particles smaller than 1 micrometer, formed when larger plastics break down or are manufactured for industrial use. They are small enough to pass through most filtration systems and enter water supplies, soil, and plant tissues.
The term “microplastics” first appeared in literature in 2004 to describe microscopic plastic fragments in ocean samples, per Science AAAS. Even smaller nanoplastics gained attention in the following decade as detection methods improved. By the early 2020s, researchers documented them in bottled water, seafood, air, and human blood.
The Dallas Express has previously reported on nanoplastics in bottled water, noting that they can leach from plastic containers and potentially enter the bloodstream.
Texas A&M Findings
In the 2025 study published in the Journal of Agricultural and Food Chemistry, Ph.D. student Michael Bryant, working with Dr. Xingmao “Samuel” Ma, exposed hydroponic lettuce to polystyrene nanoplastics and cadmium.
Dr. Ma stated that “We should begin reassessing ‘safe’ cadmium limits, and heavy metals in general, in agricultural soil and soilless media,” per a March 17, 2026, press release by Texas A&M University.
The research showed that nanoplastics triggered oxidative stress in the plants, weakening their natural defenses. Normally, plants limit cadmium movement to leaves by storing it in roots—combined exposure disrupted this process.
Dr. Ma added that “We theorize this outcome is due to the increased root branching caused by cadmium exposure. Nanoplastics do not participate in any of the active transport mechanisms performed by the plant. Rather, they are passively taken up at gaps in the root surface.”
Health Concerns and Widespread Presence
Cadmium is a known toxic heavy metal linked to kidney damage, bone issues, and certain cancers with long-term exposure. Nanoplastics themselves are associated in lab studies with oxidative stress, inflammation, and potential contributions to metabolic, respiratory, and cardiovascular concerns, as reported by The Lancet Planetary Health. Some animal and cell studies suggest links to increased cancer risk through DNA damage and immune effects, though direct human causation remains under study.
Nanoplastics and microplastics are now found worldwide in soil, water, air, and food chains. They appear in agricultural fields through sewage sludge, irrigation water, plastic mulch, and atmospheric deposition. The issue is global, with higher concentrations reported near urban and industrial areas.
