AI Article Synopsis

  • The study aimed to investigate how changes in urine excretion of isoflavonoids affect cognitive changes in healthy postmenopausal women.
  • It involved 350 participants who were given either isoflavonoid-rich soy protein or a placebo over an average of 2.7 years, with urine, plasma isoflavonoid levels, and cognitive function being measured.
  • Results showed no significant link between isoflavonoid changes and overall cognition, but higher isoflavonoid levels correlated with a decrease in general intelligence, suggesting further research is needed to confirm these findings.

Article Abstract

Objectives: To determine effect of change in urine excretion of isoflavonoids on cognitive change.

Design: Post hoc analysis of isoflavonoid exposure (mean 2.7 years) during the randomized, placebo-controlled, double-blind Women's Isoflavone Soy Health trial.

Setting: General community.

Participants: Healthy postmenopausal women (N = 350).

Intervention: Twenty-five grams of isoflavone-rich soy protein (91 mg of aglycone weight isoflavones: 52 mg genistein, 36 mg daidzein, 3 mg glycitein) or milk protein-matched placebo provided daily.

Measurements: Overnight urine excretion, fasting plasma levels of isoflavonoids, and cognitive function measured at baseline and endpoint.

Results: Three hundred women (age: mean 61, range 45-92) completed both cognitive assessments and did not use hormone replacement therapy during the trial. Mean on-trial change from baseline in urine excretion of isoflavonoids was not significantly associated with change in a composite score of global cognition (P = .39). Secondary analyses indicated that change in urine excretion of isoflavonoids was inversely associated with change in a factor score representing general intelligence (P = .02) but not with factor scores representing verbal or visual episodic memory. Mean differences in this general intelligence factor score between women in the lowest and highest quartiles of isoflavonoid change were equivalent to an approximate 4.4-year age-associated decline. Analyses based on plasma isoflavonoid levels yielded similar but attenuated results.

Conclusion: In healthy postmenopausal women, long-term changes in isoflavonoids are not associated with global cognition, supporting clinical trial results, although greater isoflavonoid exposure from dietary supplements is associated with decrements in general intelligence but not memory; this finding requires confirmation in future studies.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4226524PMC
http://dx.doi.org/10.1111/jgs.12752DOI Listing

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