title: Effects of soy isoflavone supplementation on cognitive function in Chinese postmenopausal women: a double-blind, randomized, controlled trial.
abstract: OBJECTIVE
  To investigate whether soy-derived isoflavone extract improves performance in cognitive function and quality of life in Chinese postmenopausal women.
  
  
  METHODS
  The study was a 6-month double-blind, randomized, placebo-controlled, parallel group trial. Participants were community-dwelling women aged 55 to 76 years; 191 eligible women were randomly assigned to receive a daily oral intake of 80 mg soy-derived isoflavones or an identical-appearing placebo for 6 months. Standardized neuropsychological tests of memory, executive function, attention, motor control, language, and visual perception and a global cognitive function assessment were administered face-to-face individually at baseline and at 6-months posttreatment. The validated Chinese version of the Short Form-36 was used for quality of life measurements.
  
  
  RESULTS
  Of the participants, 88% (168 women: 80 among the supplementation group and 88 among the placebo group) completed the trial. Intention-to-treat analysis, conducted for 176 participants with 6-month assessment results, revealed no significant differences in outcome measures between treatment groups. Subgroup analysis among the good compliers only (consumed at least 80% of the supplements or placebo; n = 168) and among the age groups younger or older than 65 years also indicated no significant differences for any outcome measures. Types of complaints of adverse events were similar in both treatment groups and included mainly gastrointestinal and musculoskeletal problems.
  
  
  CONCLUSIONS
  This 6-month trial indicates that 80-mg soy-derived isoflavone supplementation did not improve performance on standard neuropsychological tests and overall quality of life in generally healthy Chinese postmenopausal women.
authors.affiliation: Department of Community and Family Medicine, School of Public Health, The Chinese University of Hong Kong, SAR. suzanneho@cuhk.edu.hk
authors.forename: Suzanne C
authors.initials: SC
authors.lastname: Ho
authors.forename: Agnes S Y
authors.initials: AS
authors.lastname: Chan
authors.forename: Yee Ping
authors.initials: YP
authors.lastname: Ho
authors.forename: Edwin K F
authors.initials: EK
authors.lastname: So
authors.forename: Aprille
authors.initials: A
authors.lastname: Sham
authors.forename: Benny
authors.initials: B
authors.lastname: Zee
authors.forename: Jean L F
authors.initials: JL
authors.lastname: Woo
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D002681:China; D003071:Cognition / Q000187:drug effects*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007529:Isoflavones / Q000008:administration & dosage* / Q000494:pharmacology; D008875:Middle Aged; D015663:Osteoporosis, Postmenopausal / Q000517:prevention & control; D017698:Postmenopause / Q000187:drug effects / Q000378:metabolism*; D030262:Soybean Proteins / Q000008:administration & dosage* / Q000494:pharmacology; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D016387:Women's Health
chemical_list: D007529:Isoflavones; D030262:Soybean Proteins