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Mycotoxins: Causes, Effects & Prevention
Mycotoxins are toxic secondary metabolites produced by mold fungi that can contaminate food and feed, posing serious health risks to humans and animals worldwide.
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Mycotoxins are toxic secondary metabolites produced by mold fungi that can contaminate food and feed, posing serious health risks to humans and animals worldwide.
What Are Mycotoxins?
Mycotoxins (from Greek mykes = fungus and Latin toxicum = poison) are naturally occurring toxic compounds produced as secondary metabolites by various mold species. They can contaminate food, animal feed, and agricultural products, representing a major global health concern for both humans and animals. Importantly, mycotoxins can persist in food even after the mold has been removed or killed, as they are heat-stable and chemically resistant.
Major Types of Mycotoxins
Hundreds of mycotoxins are known to science. The most medically and food-safety-relevant ones include:
- Aflatoxins: Produced mainly by Aspergillus flavus and Aspergillus parasiticus. They are among the most potent naturally occurring carcinogens and commonly contaminate nuts, maize, and cereals.
- Ochratoxin A: Produced by Aspergillus and Penicillium species, found in cereals, coffee, dried fruit, and grapes. It is nephrotoxic, hepatotoxic, and possibly carcinogenic.
- Deoxynivalenol (DON, Vomitoxin): A trichothecene mycotoxin produced by Fusarium species in cereals. It causes nausea, vomiting, and immune suppression.
- Zearalenone: Also produced by Fusarium species, it has estrogenic activity and can disrupt the hormonal system.
- Fumonisins: Found in maize and maize products, associated with esophageal cancer and neural tube defects.
- Patulin: Produced by Penicillium species, mainly in spoiled fruit (especially apples) and fruit juices.
Causes and Conditions of Formation
Mycotoxins develop when environmental conditions favor mold growth. Contributing factors include:
- High humidity and temperature (varying by mold species)
- Improper storage of food and harvested crops
- Physical damage to crops caused by insects or mechanical injury
- Extreme weather events such as drought or excessive rainfall
- Inadequate storage hygiene
Health Effects (Mycotoxicoses)
Illnesses caused by the ingestion of mycotoxins are referred to as mycotoxicoses. The severity depends on the type of toxin, the amount ingested, the duration of exposure, and the overall health status of the individual.
Acute Poisoning
- Nausea, vomiting, and diarrhea
- Abdominal pain
- Dizziness and headache
- In severe cases: liver failure, hemorrhage, coma
Chronic Exposure
- Liver toxicity, potentially leading to cirrhosis and liver cancer (especially from aflatoxins)
- Kidney dysfunction (especially from ochratoxin A)
- Immune suppression and increased susceptibility to infections
- Endocrine disruption (especially from zearalenone)
- Growth retardation in children
- Carcinogenic effects from specific toxins
Diagnosis
Diagnosis of mycotoxin exposure is made through several methods:
- Blood and urine analyses: Detection of mycotoxins or their metabolites (biomarkers) in the body
- Food testing: Laboratory analysis of suspect foods using ELISA or HPLC methods
- Clinical examination: Assessment of symptoms and medical history by a physician
- Liver and kidney function tests: To evaluate potential organ damage
Treatment
No specific antidote therapy exists for most mycotoxins. Treatment of mycotoxicosis is therefore primarily supportive:
- Immediate cessation of toxin exposure (removal of contaminated food)
- Supportive care: fluid replacement, electrolyte correction
- Medical monitoring of liver and kidney function
- In severe cases: hospitalization and intensive medical care
Prevention and Legal Limits
To protect public health, the European Union has established maximum permitted levels for various mycotoxins in food (EU Regulation No. 1881/2006 and subsequent amendments). Preventive measures include:
- Proper harvesting and storage under controlled temperature and humidity conditions
- Regular monitoring and analysis of food and feed products
- Use of fungicides in agriculture (in compliance with legal requirements)
- Consumer awareness: moldy foods should be completely discarded, as toxins can penetrate deeper into the food than the visible mold
- Use of binding agents (adsorbents) in animal husbandry to bind toxins in the gut
References
- European Food Safety Authority (EFSA): Mycotoxins - Scientific Opinions and Assessments. www.efsa.europa.eu (2024).
- World Health Organization (WHO): Mycotoxins - Fact Sheet. www.who.int (2018).
- Bennett, J.W. & Klich, M.: Mycotoxins. Clinical Microbiology Reviews, 16(3), 497-516 (2003).
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