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Area of Science:

  • Environmental Health
  • Toxicology
  • Epidemiology

Background:

  • Chronic arsenic exposure via drinking water is a significant public health concern, linked to increased mortality from chronic diseases.
  • Limited evidence exists on the health benefits of reducing arsenic exposure in affected populations.

Purpose of the Study:

  • To investigate the association between reduced arsenic exposure, measured by urinary arsenic levels, and mortality risk from chronic diseases, including cancer and cardiovascular disease (CVD).

Main Methods:

  • Prospective cohort study in Bangladesh (n=10,977) with repeated measurements of urinary arsenic levels over time (2000-2018).
  • Community-level mitigation efforts led to reduced arsenic exposure.
  • Time-varying Cox regression and restricted cubic spline analyses were used to assess mortality risk associated with changes in arsenic exposure.

Main Results:

  • Each interquartile range (IQR) decrease in urinary arsenic was associated with a 22% reduction in chronic disease mortality, 20% in cancer mortality, and 23% in CVD mortality.
  • Participants whose urinary arsenic levels declined below the median showed significantly lower mortality rates compared to those with consistently high levels.
  • Reductions in arsenic exposure were consistently linked to lower mortality, while increases were associated with higher risk.

Conclusions:

  • Reduced arsenic exposure, even after chronic exposure, is associated with significant reductions in mortality from chronic diseases.
  • These findings highlight the importance of public health interventions aimed at lowering arsenic levels in drinking water to improve population health outcomes.