Healthy people depend on healthy food. New research on barley raises concerns about plastic pollution’s effects on the soil that nourishes our crops—and separate studies are finding troubling signals inside the human body.
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THE TOPLINE
- Plastic pollution can disrupt the systems that grow our food. A greenhouse barley study found that high microplastic concentrations reduced photosynthesis and altered soil nutrients, enzyme activity, and microbial communities.
- Human research raises additional concerns. Studies have detected plastics throughout the body and linked their presence to cardiovascular risks, while other evidence suggests possible reproductive, digestive, and respiratory harm.
- Prevention requires individual choices and broader action. Reducing exposure from drinking water, food containers, and household dust should accompany efforts to curb agricultural plastic pollution and protect soil health.
We cannot build a healthy population without healthy food. And protecting the quality of our food begins long before anyone walks into a grocery store or sits down to dinner. It begins with how we care for the land that feeds us.
That is why a new barley study deserves attention. Under controlled greenhouse conditions, high concentrations of microplastics disrupted processes in both plants and the surrounding soil. The experiment adds to concerns that plastic pollution could interfere with the biological systems on which agriculture depends.
For ANH, protecting the land that feeds us belongs at the center of disease prevention. We cannot build a healthy population without nourishing food, and we should not take our ability to produce that food for granted.
What the Barley Study Found
Researchers grew barley for 60 days in rhizoboxes—containers used to study roots and surrounding soil—with polyethylene or polyvinyl chloride (PVC) microplastics. Plastic additions amounted to 2% or 4% of dry soil mass, with three replicates per treatment.
The higher polyethylene dose and both PVC treatments reduced photosynthesis by approximately 18–25% and altered antioxidant enzyme activity. Researchers also found changes in nutrient availability, soil-enzyme hotspots, and the organization of bacterial and fungal communities near roots. Some measures increased while others declined, indicating a complex response.
Healthy Soil Is a Human Health Issue
What happens to our food when we disrupt the living systems that help produce it?
As ANH recently explored, soil organisms help cycle nutrients, while growing conditions can influence the minerals and beneficial plant compounds in food. Diverse plant foods, in turn, supply fibers and polyphenols that support our health, like fostering a healthy gut microbiome.
Our earlier reporting on agriculture and food quality showed how the move towards large, industrialized farms that tend to rely heavily on chemical inputs has coincided with a substantial decrease in the amount of nutrients in our food. That story also presented evidence that a lack of micronutrients can make us vulnerable to chronic disease. Whether it’s pesticides and herbicides, fertilizers, or plastics, the way in which our food is deeply connected to human wellbeing.
How Widespread Is the Problem?
Plastic is deeply embedded in food production. The UN Food and Agriculture Organization estimatedthat agricultural value chains used 12.5 million metric tons of plastic in plant and animal production in 2019, plus37.3 million metric tons in food packaging. These are amounts used, not measurements of plastic released into soil. But FAO identifies agricultural films left behind after use as a source of fragments that can accumulate in farmland.
The problem also extends into everyday drinking water. A 2024 study examining three bottled-water brands estimated an average of 240,000 plastic particles per liter, approximately 90% of them nanoplastics—particles smaller than one micrometer.
Researchers have also detected plastic particles in human blood, lungs, and reproductive tissues, including the placenta.
Troubling Signals for Human Health
Those exposures have consequences. One of the strongest human warning signals comes from a 2024 study in the New England Journal of Medicine. Researchers followed 257 patients after surgery to remove plaque from their carotid arteries. Over roughly three years, heart attack, stroke, or death from any cause occurred in 20% of patients with microplastics or nanoplastics detected in their plaque, compared with 7.5% of those without detectable particles.
Other research points toward possible reproductive, digestive, and respiratory effects. A 2024 systematic review evaluated three human observational studies and 28 animal studies, concluding that microplastics are suspected of harming these systems. Findings included adverse effects on sperm quality and signals involving inflammation, intestinal changes, and lung injury.
A healthcare strategy centered on prevention must take the quality of our food and environment seriously. We cannot expect to nourish healthy people while neglecting the land that feeds them.
Which Purchases Deserve Attention?
Consumers understandably want to know which products contribute most to their exposure, but it isn’t an easy question. Swallowing particles, breathing them in, and applying them to skin are different exposures, and particle counts alone do not tell us how much is absorbed or retained.
A 2023 exposure review identified indoor air and drinking water as major sources in the evidence it assessed. A 2025 systematic evidence map also found that food-contact materials were a significant contributor.
These findings suggest several practical places to focus:
- Start with what you drink. Bottled water is a documented source of plastic particles, so good home water filtration systems are a good alternative.
- In the kitchen, plastic containers and other food-contact materials can shed particles, although the amount varies with the material and how it is used. Choose suitable glass or ceramic containers for heating food, and replace badly worn plastic items.
- Synthetic clothing, carpets, and furnishings can also shed fibers into indoor air and dust. Reduce accumulated dust and consider durable, lower-shedding materials when replacing household items.
- Some makeup and personal-care products contain microplastics that contact skin or wash into wastewater. Using these products increases the risk of exposure to microplastics. Look for manufacturers that clearly disclose whether their products contain solid plastic particles.
Prevention Begins Before the Dinner Plate
For ANH, the implications reach beyond asking consumers to make better choices. People should be able to choose nourishing foods without having to unknowingly bear the risk of exposure to pollution introduced throughout production, processing, and packaging.
We need research that connects realistic agricultural exposures with soil function, crop performance, and food quality. We also need practical support for farmers to reduce plastic losses, recover agricultural films, and adopt effective alternatives where feasible. Pollution prevention should accompany efforts to rebuild soil health.
As suggested above, we can also all work to reduce our microplastic exposure from food and drink. Following are some important ways:
- Drink filtered tap water instead of bottled water, which can contain hundreds of thousands of plastic particles per liter.
- Filter water with a reverse osmosis system or carbon pitcher filter. You may want to add selected minerals to this water, and re-structure the water using one of the many devices for this purpose on the market.
- Store and reheat food in glass, ceramic, or stainless steel rather than plastic.
- Never microwave plastic—transfer food to glass or ceramic first, as heat increases microplastic and chemical release.
- Avoid plastic and polymer-based tea bags (which can release billions of particles per cup); use loose-leaf tea with a metal or glass steeper.
- Replace plastic cutting boards, spatulas, and spoons with wood, bamboo, or stainless steel.
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