农药残留对肠道微生物群系和人类健康的影响_110页_4mb

Summary of "The Impact of Pesticide Residues on the Gut Microbiome and Human Health - A Food Safety Perspective"

Core Content

This document, published by the Food and Agriculture Organization (FAO) in 2023, explores the impact of pesticide residues on the gut microbiome and human health from a food safety perspective. It provides a comprehensive review of scientific literature published between September 2019 and May 2020, analyzing the relationship between pesticide exposure, gut microbiome disturbances, and subsequent health effects. The document emphasizes the importance of integrating microbiome data into pesticide risk assessment frameworks.

Main Findings

Individual Pesticides

Several individual pesticides have been studied for their effects on the gut microbiome and human health, including:

• 2,4-D: Altered microbiome composition and host health outcomes.
• Aldicarb: Influenced microbiome diversity and immune responses.
• Carbendazim: Linked to metabolic and immune alterations.
• Chlorpyrifos: Associated with gut dysbiosis and neurological effects.
• Deltamethrin: Impacted microbiome structure and host immunity.
• Diazinon: Caused changes in microbial diversity and intestinal homeostasis.
• Endosulfan: Disrupted microbiome composition and had endocrine effects.
• Epoxiconazole: Affected microbiome and led to metabolic and liver dysfunctions.
• Glyphosate: Most extensively studied, showing effects on microbial diversity, SCFA production, and host health.
• Imazalil: Linked to microbiome changes and metabolic effects.
• Malathion: Influenced microbiome and had potential effects on immune function.
• Monocrotophos: Associated with microbiome disruption and liver toxicity.
• Penconazole: Impacted microbiome and host health.
• Permethrin: Caused changes in microbial structure and immune responses.
• Propamocarb: Altered microbiome and had metabolic effects.

By-products and Metabolites

• P,p'-DDE and β-HCH (metabolites of organochlorine pesticides): Linked to microbiome disturbances and host health effects.
• The effects of pesticide by-products are often studied alongside the active ingredients, but data remains limited.

Pesticide Mixtures and Multi-Residue Exposure

• Pesticide mixtures are common in food and agricultural products, and their combined exposure can lead to more complex and significant microbiome disruptions.
• The potential negative health impacts of co-formulants (e.g., adjuvants) in commercial products are noted, though further research is needed.

Key Information

Gut Microbiome Overview

• The gut microbiome consists of bacteria, viruses, fungi, and archaea that interact with the host in various physiological functions, including digestion, immune response, and metabolism.
• It is highly sensitive to environmental and dietary factors, making it a critical component of human health.

Human Health Impacts

• Pesticide exposure has been associated with changes in gut microbiome composition and function, potentially leading to:
  • Metabolic disorders
  • Immune system alterations
  • Neurobehavioral changes
  • Endocrine imbalances
  • Intestinal homeostasis disruption
• Some studies suggest that early-life exposure can increase the risk of disorders such as type 2 diabetes and motor disabilities.

Risk Assessment Considerations

• The Joint Meeting on Pesticide Residues (JMPR) has historically focused on evaluating pesticide active ingredients, not their by-products or formulations.
• The document recommends incorporating microbiome data into risk assessments, particularly for evaluating the effects of pesticide residues on the gut microbiome and subsequent health impacts.
• The current risk assessment framework may not adequately account for microbiome-related effects, especially when considering chronic low-dose exposure.

Methodology

• A systematic review of peer-reviewed articles was conducted using databases such as PubMed, Web of Science, and Scopus.
• The search strategy included:
  • Pesticide main use categories: Based on Codex Alimentarius, WHO, and JMPR reports.
  • Individual pesticides: Focused on specific compounds and their effects.
  • Pesticide mixtures and co-formulants: Considered the combined and synergistic effects of multiple residues.
  • Chemical type categories: Based on WHO and JMPR classifications.
• The search terms were progressively more restrictive, moving from "human gut microbiome" to "gut microbiome" to "microbiome".
• Experimental doses were often higher than acceptable daily intake (ADI) and other health-based guidance values, which may limit their relevance to real-world exposure scenarios.

Challenges

• Statistical limitations: Many studies have small sample sizes and low statistical power.
• Methodological inconsistencies: Lack of standardized models and analytical methodologies.
• Confounding factors: Limited control and consideration of variables that may influence microbiome changes.
• Translatability: Difficulty in applying animal microbiome findings to the human context.
• Causality and mechanisms: Most studies lack mechanistic evidence or proof of cause-effect relationships.
• Guidance and integration: There is a lack of clear guidelines for incorporating microbiome data into chemical risk assessments.

Conclusion and Recommendations

• The gut microbiome is a critical factor in understanding the long-term health effects of pesticide exposure.
• While some studies show clear links between pesticide residues and microbiome alterations, more research is needed to establish causality and mechanisms.
• The FAO recommends integrating microbiome data into pesticide risk assessments and developing standardized methodologies to better evaluate the impact of pesticide residues on gut health.
• Further exploration of the relationship between microbiome changes and non-communicable diseases is essential for a holistic approach to food safety.

References and Appendices

• The document includes a bibliography and several annexes with detailed methodology notes, findings, and pesticide classifications.
• Annex I provides methodology notes and query results.
• Annex II summarizes experimental studies on individual pesticides.
• Annex III classifies pesticides based on their chemical types.

This review highlights the growing importance of the gut microbiome in food safety and health risk assessment, urging for more comprehensive and standardized research in this area.