Soy does not improve effects of menopause
Women taking soy protein and isoflavones to counteract the effects of the menopause may be wasting their time. A study examining the effect of a soy supplement has found that it did not improve cognitive function, bone mineral density or plasma lipid levels.
Researchers in the Netherlands compared use of a soy protein supplement
with placebo in 202 healthy postmenopausal women aged between 60 and
75 years. Participants received either 25.6g of soy protein containing
99mg isoflavones or total milk protein as a powder daily for 12 months.
After a year, they found no difference between the groups in terms of
cognitive function, bone mineral density or plasma lipids. Although one
of 13 measurements of bone mineral density was improved in the soy group,
the authors comment that because it was only one among 13 comparisons
it could be a chance finding.
The lack of effect contrasts with some earlier studies. The authors point
to differences that might explain this, such as the other studies being
conducted in animals, men or younger populations, or having a small number
of trial participants. One difference they say requires further research
is the influence of the timing of supplementation since women who are
recently menopausal may benefit more from soy protein supplements than
women in later stages of the menopause (JAMA 2004;292:65).
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