From Field to Fork: Layered Defenses Could Slash Aflatoxin in the World’s Food

Aflatoxins are among the most insidious contaminants in the global food supply. Produced by certain strains of Aspergillus flavus and Aspergillus parasiticus, these fungal toxins can colonize staple crops such as maize, groundnuts, and tree nuts both in the field and in storage, and chronic dietary exposure is linked to liver cancer, immune suppression, and growth impairment in children. Because aflatoxins are heat-stable and resist ordinary cooking, contamination that survives harvest and processing reaches consumers directly. A new narrative review published in Discover Sustainability by Gudisa Bereda of Marie Stopes International Ethiopia and Javed Ahamad of Tishk International University argues that no single intervention can eliminate the threat, and that sustainable management instead demands a multi-barrier approach spanning the entire farm-to-fork continuum.

The review, which followed the Scale for the Assessment of Narrative Review Articles (SANRA) to ensure methodological rigor, synthesized literature retrieved from PubMed, Scopus, Web of Science, and Google Scholar. Its central conclusion is sobering but constructive: complete elimination of aflatoxins is not feasible given the complexity of the contamination pathways, yet layered interventions applied at successive points in the food chain can dramatically reduce exposure. The authors frame aflatoxin contamination as a persistent global food safety issue that is especially acute in resource-limited regions, where it threatens food security, public health, agricultural productivity, and the sustainability of food systems simultaneously.

The quantitative picture that emerges from the synthesis is striking. Integrated pre-harvest strategies, which combine agronomic practices with biological control, were reported to reduce aflatoxin levels by approximately 51 to 99 percent across individual studies. Post-harvest interventions, including improved drying and storage, achieved reductions of 30 to 94 percent. Advanced sorting technologies, which physically remove contaminated kernels from otherwise acceptable lots, eliminated up to 99 percent of contaminated material. Biological detoxification methods reduced aflatoxin levels by 45 to 99 percent, enzymatic systems achieved degradation rates of up to 95 percent, chemical methods ranged from 20 to 100 percent reduction, and physical treatments delivered 15 to 90 percent reductions depending on the conditions applied.

Crucially, the authors caution that these figures are not pooled estimates and cannot be directly compared with one another. Differences in experimental conditions, commodities, baseline contamination levels, analytical methods, and study settings mean that a 99 percent reduction reported in one laboratory trial of a biocontrol agent on maize cannot be assumed to translate to a smallholder groundnut field in a different climate. This transparency is a notable strength of the review: rather than presenting a single seductive number, it maps the landscape of available evidence and its limits, giving policymakers and food safety managers a realistic sense of what each barrier can and cannot deliver.

The pre-harvest stage is where the contamination cycle begins, and the review emphasizes that prevention at the source is the most sustainable starting point. Agronomic practices such as timely planting, adequate irrigation, pest control, and soil management reduce the plant stress that favors Aspergillus infection, while resistant crop varieties and biological control agents that compete with toxigenic fungal strains can suppress aflatoxin formation before harvest. Biological control in particular has gained traction in recent years, relying on non-toxigenic strains of the same fungi to outcompete their toxin-producing relatives in the field. When these measures are integrated rather than applied in isolation, the reported reductions in aflatoxin accumulation become substantial.

Once crops are harvested, the battle shifts to drying, storage, and handling. Poor post-harvest management is a dominant driver of contamination in tropical and subtropical regions, where high humidity and inadequate infrastructure allow fungi to flourish in stored grain. The review documents how proper drying to safe moisture levels, hermetic storage, improved ventilation, and hygiene measures can cut aflatoxin levels by 30 to 94 percent. These interventions are often low-cost and locally implementable, making them especially relevant for smallholder farmers and community-level food systems where the burden of contamination is heaviest and regulatory testing infrastructure is weakest.

Downstream, technological and biochemical barriers offer additional layers of protection. Advanced optical and electronic sorting systems can detect and eject discolored or mold-damaged kernels at industrial speed, removing up to 99 percent of contaminated material from a processing line. Biological detoxification exploits microorganisms or their products to bind or transform aflatoxins, while enzymatic degradation uses specific enzymes to break down the toxin molecule itself, with reported degradation reaching 95 percent. Chemical treatments, such as ammoniation, and physical treatments, such as irradiation or adsorption onto binding agents, round out the toolkit, each with its own efficacy range, cost profile, and regulatory considerations.

The multi-barrier logic is what elevates the review from a catalog of techniques to a coherent strategy. Each individual barrier is imperfect, and residual contamination passing one stage can be intercepted by the next. By integrating agronomic practices, biocontrol, proper storage, and detoxification across the food chain, the cumulative reduction in exposure can approach the levels needed to protect public health, even where no single measure achieves it alone. The authors argue that this integration can improve food safety and security, reduce post-harvest losses, and promote sustainable agriculture, turning a fragmented set of interventions into a system-level defense.

The implications extend well beyond food chemistry. The review explicitly connects integrated aflatoxin management to the United Nations Sustainable Development Goals, including SDG 2 on Zero Hunger, SDG 3 on Good Health and Well-being, SDG 9 on Industry, Innovation and Infrastructure, SDG 12 on Responsible Consumption and Production, SDG 13 on Climate Action, and SDG 15 on Life on Land. Climate change looms large in this framing: rising temperatures and shifting rainfall patterns are expected to expand the geographic range of aflatoxin-producing fungi into regions previously considered low-risk, making resilient, multi-layered management systems a matter of adaptation as much as prevention. Protecting vulnerable populations, particularly in sub-Saharan Africa and South Asia where exposure is highest, depends on making these strategies accessible and affordable.

As the global food system confronts the twin pressures of a growing population and a changing climate, the review’s message is that aflatoxin management must be treated as a continuous chain of responsibility rather than a series of disconnected fixes. From the seed in the soil to the meal on the plate, every stage offers an opportunity to interrupt contamination, and every stage that is neglected undermines the others. For researchers, the work highlights the need for standardized, comparable studies that can support pooled estimates and evidence-based policy. For farmers, processors, and regulators, it offers a practical blueprint: stack the barriers, match them to local conditions, and treat food safety as a system. In a world where millions of tonnes of grain are lost or degraded to mycotoxin contamination each year, that blueprint may prove one of the most cost-effective public health tools available.

Subject of Research: Farm-to-fork multi-barrier strategies for managing aflatoxin contamination in food systems

Article Title: Sustainable farm-to-fork multi-barrier strategies for aflatoxin management in food systems

Article References: Bereda, G., & Ahamad, J. (2026). Sustainable farm-to-fork multi-barrier strategies for aflatoxin management in food systems. Discover Sustainability. https://doi.org/10.1007/s43621-026-04982-0

Image Credits: AI Generated

DOI: 10.1007/s43621-026-04982-0

Keywords: aflatoxins, food safety, food security, multi-barrier strategies, biocontrol, post-harvest losses, detoxification, sustainable agriculture, mycotoxins, farm-to-fork, SDGs, public health