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Eating soya improves human memory.

S E File1, N Jarrett, E Fluck

  • 1Psychopharmacology Research Unit, Centre for Neuroscience, Hodgkin Building, King's College London, Guy's Campus, London SE1 1UL, UK. sandra.file@kcl.ac.uk

Psychopharmacology
|October 18, 2001
PubMed
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A high soya diet significantly improved memory and mental flexibility in young adults. These cognitive benefits from soya isoflavones were observed in both males and females, indicating broader effects beyond verbal tasks.

Area of Science:

  • Nutritional Neuroscience
  • Cognitive Psychology
  • Endocrinology

Background:

  • Soya foods contain isoflavone phytoestrogens, which exhibit weak estrogen receptor agonist activity.
  • Estrogen therapy has previously demonstrated memory enhancement in specific populations.

Purpose of the Study:

  • To investigate the impact of high versus low soya diets on cognitive functions, including attention, memory, and frontal lobe operations.
  • To assess these effects in healthy young adults of both sexes.

Main Methods:

  • Student volunteers were randomized into high soya (100 mg isoflavones/day) or low soya (0.5 mg isoflavones/day) diet groups.
  • Diets were supervised for 10 weeks, with cognitive tests administered at baseline and post-intervention.

Related Experiment Videos

Main Results:

  • The high soya diet group exhibited significant improvements in short-term memory, long-term memory, and mental flexibility in both males and females.
  • Enhanced performance in specific tests (letter fluency, planning) was noted only in females on the high soya diet.
  • No significant effects on attention or category generation tasks were observed; however, mood-related improvements (reduced tension) were reported in the high soya group.

Conclusions:

  • Dietary interventions with soya can yield notable cognitive enhancements within a short timeframe.
  • The cognitive benefits of a high soya diet extend to both sexes and encompass non-verbal cognitive domains.