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The
following extract is from "Toxiques Naturels", Bulletin
de office federal de la sonte Division Science des aliments:
Experts on Safety Publique No 28, 20/07/1992.
3.3 Substances
with an oestrogenic action
As is clear from their definition,
these substances have a hormonal effect similar to that of oestrogen
in animals and humans. Their origin varies: while the coumestanes
and isoflavones, daidzin and genistein, may be included in the phytoalexin
group, zearalenone belongs to the mycotoxin group. Isoflavones
are contained in plant foodstuffs, in particular in beans (in our
garden beans and soya beans) and in garden peas. Their concentration
in these foodstuffs is fairly high and can reach a few grams per
kilogram in soya beans, for example. The method of preparing
the foodstuff does not appear to influence this content in any significant
manner. The constant absorption of such quantities of these
substances could clearly cause effects in humans: through the consumption
of 100 g of the foodstuff, 1 g of isoflavone would be absorbed,
corresponding to 100 ug "of equivalents to oestrogen".
This quantity is within the range of the oestrogen content
of the "pill".
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