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Concurrent serum lead levels and cognitive function in older adults.

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This study found no link between current serum lead levels and cognitive function in older adults. Earlier or ongoing lead exposure may impact cognitive decline over time.

Keywords:
biomarkercognitionheavy metalleadseniors

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Area of Science:

  • Environmental Health
  • Neuroscience
  • Gerontology

Background:

  • Lead exposure is a public health concern, particularly for older adults.
  • Cognitive decline is a significant issue in aging populations.
  • Understanding environmental factors influencing cognition is crucial for public health.

Purpose of the Study:

  • To investigate the association between serum lead levels and cognitive performance in US older adults.
  • To determine if current lead exposure is linked to immediate cognitive function in this demographic.

Main Methods:

  • Analysis of data from 768 older adults (≥60 years) from the National Health and Nutrition Examination Survey (NHANES) 2011-2013.
  • Assessment of serum lead concentrations using mass spectrometry.
  • Cognitive function evaluated using memory tests (CERAD-WL), verbal fluency (AFT), and processing speed (DSST), with adjusted multiple linear regression models.

Main Results:

  • The average serum lead concentration was 1.8 µg/dL (SD 1.6).
  • No significant association was found between serum lead levels and test-specific cognitive scores (CERAD-WL, AFT, DSST) or global cognitive z-scores.
  • Results were adjusted for age, sex, race/ethnicity, education, depressive symptoms, alcohol use, and BMI.

Conclusions:

  • Concurrent serum lead concentration is not associated with cognitive performance in older adults.
  • The findings suggest that past or continuous lead exposure, rather than current levels, may be more critical for cognitive decline in aging.
  • Further research into the long-term effects of lead exposure on cognitive aging is warranted.