Is cumulated pyrethroid exposure associated with prediabetes? A cross-sectional study

Area of Science:

• Environmental Health
• Toxicology
• Endocrinology

Background:

• Pyrethroids are widely used insecticides in vector control.
• Cumulative exposure effects, particularly on glucose regulation, are not well understood.
• This study investigates the association between pyrethroid exposure and abnormal glucose regulation.

Purpose of the Study:

• To examine the relationship between pyrethroid exposure and abnormal glucose regulation (prediabetes or diabetes).
• To assess the prevalence of abnormal glucose regulation in pesticide sprayers compared to controls.

Main Methods:

• Cross-sectional study involving 116 pesticide sprayers and 92 nonexposed controls in Bolivia.
• Pesticide exposure assessed via questionnaires (duration, intensity, cumulative exposure).
• Blood samples analyzed for glycosylated hemoglobin (HbA1c) to measure glucose regulation.

Main Results:

• No association found between pyrethroid exposure and diabetes symptoms.
• Prevalence of abnormal glucose regulation (HbA1c ≥ 5.6%) was 61.1% in sprayers versus 7.9% in controls (OR 11.8).
• A positive trend observed between cumulative pyrethroid exposure and abnormal glucose regulation.

Conclusions:

• Severely increased prevalence of prediabetes among Bolivian pesticide sprayers compared to controls.
• Association found between cumulative pyrethroid exposure and abnormal glucose regulation within the spraying group.
• Further studies are required to confirm the association between pyrethroid exposure and glucose dysregulation.