Microplastics in produce: what the research shows and how to reduce your exposure

Microplastics have been found in human blood, lung tissue, breast milk, liver, kidney, and arterial plaque. A 2024 study in the New England Journal of Medicine found their presence in arterial plaque was associated with a 4.53-fold higher rate of cardiovascular events. The question of how they get into the body has multiple answers — but one of the most significant and least discussed involves the vegetables most people eat specifically for their health.

A large meta-analysis published in early 2026 suggested that fruits, vegetables, and grains may account for the vast majority of daily microplastic intake, with adults potentially consuming tens of thousands of particles per day — far higher than older estimates. The primary pathway is agricultural soil: agricultural soils can contain significantly more plastic pollution than oceans, creating a direct route into crops through root uptake.

Key takeaways

• A 2026 meta-analysis found fruits, vegetables, and grains may account for the vast majority of daily microplastic intake — adults may consume tens of thousands of particles per day.
• The primary agricultural pathway is root uptake from contaminated soil: sourced from plastic mulch film degradation, polymer-coated fertilizers, sewage sludge, and contaminated irrigation water.
• A 2024 NEJM study found microplastics in human arterial plaque associated with a 4.53-fold higher risk of heart attack, stroke, or death.
• Washing removes surface-adhered particles but cannot address microplastics absorbed into plant tissue through root uptake or stomatal absorption.
• Hydroponic growing with no soil contact, no plastic mulch film, and a closed water system eliminates the primary agricultural pathway by which microplastics enter vegetables.
• Growing leafy greens and herbs at home also removes all retail packaging contact — eliminating the additional contamination layer that affects all store-bought produce.

How microplastics enter agricultural produce

Agricultural soil: the primary reservoir

Microplastics accumulate in agricultural soil through multiple routes: plastic mulch films degrade into fragments over successive growing seasons; polymer-coated fertilizers release their plastic casings as they dissolve; sewage sludge applied as a soil amendment brings microplastics from consumer product waste; and contaminated irrigation water deposits particles across crop surfaces and root zones. A 2021 review in Environmental Science and Technology found that agricultural soils contain microplastic concentrations significantly higher than those measured in oceanic environments — the environments that had historically received the most research attention.

Root uptake: the plant absorption mechanism

A 2020 study in Nature Sustainability documented the uptake and translocation of plastic particles through the root endodermis into plant vascular tissue, from which they can move upward into stems, leaves, and edible above-ground portions. Particles small enough to pass through the apoplastic pathway can reach edible parts. Leaf stomata provide a secondary uptake pathway: approximately 25 micrometers long, they can absorb particles through both lipophilic and hydrophilic pathways.

Packaging and processing: additional exposure layers

Beyond soil-derived microplastics, produce acquires additional plastic particles during packaging, transport, and retail display. A 2023 study in Environmental Science and Technology measuring microplastic contamination on produce surfaces at retail found contamination from packaging materials stacked on top of field-derived particles. The cumulative load at time of consumption reflects all of these stages.

Which vegetables carry the highest microplastic loads

Root vegetables and high-vascularization fruits

A 2020 study in Environmental Research found that root vegetables such as carrots and parsnips, and tree fruits such as apples and pears, tend to show higher microplastic tissue contamination than leafy vegetables. The proposed mechanism involves the extensive root system of root vegetables and the high degree of vascularization in fruit pulp, which facilitates translocation of particles from soil into edible tissue.

Leafy vegetables: surface and stomatal exposure

Leafy vegetables have large surface areas relative to their mass and are exposed to airborne deposition and irrigation water throughout their growing cycle. However, research has found that lettuce ranks among the least contaminated produce types when measured by particle concentration per gram of edible tissue — reflecting the difference between surface contamination (partially removable by washing) and tissue absorption (not removable by washing).

The organic versus conventional distinction

Organic certification restricts synthetic plastic mulch films and polymer-coated fertilizers, reducing two primary soil microplastic input pathways. Organic produce generally shows lower soil-derived microplastic loads. However, irrigation water, atmospheric deposition, and packaging-derived contamination affect organic and conventional produce similarly — organic reduces but does not eliminate microplastic exposure.

What washing can and cannot do

Surface removal: effective for external contamination

Thorough washing under running water removes a proportion of surface-adhered microplastic particles. Soaking in filtered water with agitation removes more than a simple rinse. Peeling removes surface contamination on produce where practical, at the cost of nutrients concentrated near the skin.

The limits of washing for tissue-absorbed particles

A 2022 review in Food Additives and Contaminants confirmed that systemic microplastics distributed through a plant’s vascular system are not accessible to surface washing. For produce from highly contaminated agricultural soils, washing addresses only a minority of total microplastic load.

Does washing produce remove pesticides? covers the parallel limitation — in both cases, washing is meaningful for surface contamination and insufficient for systemic absorption.

Why hydroponic growing changes the microplastic equation

Soil elimination: removing the primary pathway

The primary route by which microplastics enter conventionally grown vegetables is through contaminated agricultural soil and root uptake. Hydroponic growing systems use no soil — plants grow in water-and-nutrient solutions rather than soil media. This eliminates the primary translocation pathway entirely. A plant that never contacts microplastic-contaminated soil cannot absorb soil-derived microplastics through its roots.

No plastic mulch film

Plastic mulch films are one of the primary sources of microplastic accumulation in agricultural soil, degrading progressively into smaller, more bioavailable fragments over successive growing seasons. Hydroponic systems have no ground-level planting and no mulch film of any kind. This source input is entirely absent.

Closed water system and no retail packaging

The Gardyn Hybriponic system uses a sealed water reservoir that recirculates water through the system — without repeated exposure to external atmospheric deposition from open irrigation. And because produce goes directly from plant to kitchen at harvest, there is no plastic clamshell container, no retail bag, and no packaging contact time. The cumulative contamination that affects all store-bought produce is removed along with the retail stage itself.

Practical steps for reducing microplastic exposure from store-bought produce

• Wash thoroughly under running filtered water and soak when practical
• Peel root vegetables and thick-skinned fruits where skin is not nutritionally critical
• Use glass or stainless steel containers for food storage rather than plastic
• Avoid heating food in plastic containers, which accelerates microplastic release
• Consider filtered water for rinsing produce, as some tap water sources carry measurable microplastic loads
• Prioritise growing your most-consumed leafy greens at home hydroponically to address the category where frequency of consumption matters most

For the pesticide side of the same argument, see the Gardyn articles on pesticides on spinach: what the data shows and the 2026 Dirty Dozen. The microplastic and pesticide cases converge on the same conclusion: the cleanest produce is the produce you grew yourself.

Frequently asked questions

Are microplastics in food dangerous?

Microplastics have been detected in multiple human tissues. Their presence in arterial plaque was associated with a 4.53-fold higher cardiovascular event risk in a 2024 NEJM study. The FDA acknowledges their presence in the food supply while noting current scientific evidence has not established definitive causal risk at detected dietary levels. The precautionary principle supports reducing exposure where practical.

Does organic produce have fewer microplastics?

Generally yes, because organic certification restricts plastic mulch films and polymer-coated fertilizers that are primary soil microplastic sources. However, irrigation water, atmospheric deposition, and packaging contamination affect organic produce similarly to conventional. Organic reduces but does not eliminate exposure.

How effective is washing at removing microplastics?

Thorough washing removes surface-adhered particles. It cannot remove particles absorbed into plant tissue through root uptake or stomatal absorption. The effectiveness of washing depends on how much of the total load is surface-based versus systemically absorbed — for heavily contaminated soil-grown produce, washing may address only a minority.

Does the Gardyn system eliminate microplastic exposure entirely?

The Gardyn Hybriponic system eliminates the primary agricultural pathway: no soil, no plastic mulch film, no open irrigation from potentially contaminated surface water. These are the major routes by which microplastics enter soil-grown vegetables. The water used in the reservoir should ideally be from a filtered source.

Which vegetables are most likely to carry high microplastic loads?

Root vegetables such as carrots and parsnips show higher tissue-absorbed microplastic loads from root absorption. Tree fruits with high vascularization such as apples show elevated tissue contamination. Leafy greens accumulate more surface contamination but show relatively lower tissue translocation. All conventionally grown produce carries some level of microplastic from packaging and handling.

Lindsay Springer, Ph.D.

Director of Plants, Nutrition & Digital Agriculture at Gardyn

Lindsay leads Gardyn's Plant Health and Nutrition Team, driving plant-based product development, technological advancements, and nutrition initiatives. She holds a Ph.D. in Food Science from Cornell University, has published peer-reviewed research, and brings over a decade of growing expertise to every article.

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