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Moderate isoflavone intake may enhance cognitive processing speed in older women, while high levels may impair it. Phytoestrogens show potential for cognitive interventions in aging females.

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Area of Science:

  • Nutritional Neuroscience
  • Gerontology
  • Cognitive Aging

Background:

  • Phytoestrogens, plant-derived compounds, are increasingly studied for their potential health benefits.
  • Cognitive processing speed declines with age, impacting daily functioning in older adults.
  • Understanding modifiable factors like diet is crucial for maintaining cognitive health in aging populations.

Purpose of the Study:

  • To investigate the association between dietary phytoestrogen intake and cognitive processing speed in older women.
  • To determine if specific phytoestrogens, like isoflavones and lignans, relate to cognitive performance.
  • To explore potential intervention targets for improving cognitive function in aging females.

Main Methods:

  • Cross-sectional analysis of 200 older women from the National Health and Nutrition Examination Survey.
  • Speed of processing assessed using the Digit Symbol Substitution Test.
  • Stepwise regression models analyzed the relationship between phytoestrogens (isoflavones, lignans) and cognitive measures, controlling for covariates.

Main Results:

  • Lower lignan intake was associated with better speed of processing.
  • A significant curvilinear relationship was observed for isoflavones, with moderate levels linked to better cognitive speed.
  • High isoflavone intake was unexpectedly associated with worse cognitive processing speed.

Conclusions:

  • Moderate isoflavone consumption may benefit cognitive processing speed in older women.
  • High phytoestrogen intake, particularly isoflavones, warrants caution due to potential negative cognitive effects.
  • Phytoestrogens represent a potential avenue for future cognitive interventions in aging females, requiring further investigation.