Alleged benefits experienced after the consumption of soy in Asian countries have been attributed to the isoflavone content of soy products. Amongst other benefits, isoflavones are believed to relieve menopausal symptoms and are therefore often consumed in supplement form in Western countries. These supplements contain relatively high amounts of isoflavones and are on the market in different compositions. The question is whether supplements with different compositions exert similar effects or whether the effects differ substantially.
Intervention study with two substudies; each substudy is a double blind placebo controlled crossover intervention study. The first substudy has two groups: 'high daidzein' supplement versus placebo (n=18) and vice versa (n=18); the second substudy also has two groups 'high genistein' versus placebo (n=18) and vice versa (n=18).
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Masking
TRIPLE
Enrollment
72
8 weeks exposure to the supplement, daily 100 mg of isoflavones
8 weeks exposure to the supplement, daily 100 mg of isoflavones
Wageningen University
Wageningen, Gelderland, Netherlands
Gene-expression in PBMCs
after placebo vs after treatment measured by microarrays
Time frame: after 8 weeks exposure to supplement vs after 8 weeks exposure to placebo
Isoflavone levels in plasma
after placebo vs after treatment measured by HPLC
Time frame: before and after 8 weeks exposure to supplement vs before and after 8 weeks exposure to placebo
Gene - expression in adipose tissue
after placebo vs after treatment measured by QPCR
Time frame: after 8 weeks exposure to supplement vs after 8 weeks exposure to placebo
Isoflavone levels in adipose tissue
levels after placebo vs levels after treatment measured by HPLC
Time frame: after 8 weeks exposure to supplement vs after 8 weeks exposure to placebo
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