Phytoestrogens - Friends or Foes?
c.2002 Susun S Weed
author of Breast Cancer?
Breast Health! The Wise Woman Way
Phytoestrogens are weak hormones found in many plants. They are currently
being promoted, sometimes in highly refined forms, for relief of the
symptoms of menopause. Are they safe? Can they promote breast cancer?
We know that increased exposure to hormones - such as those used in
the cattle industry, those given to women during menopause, those
taken by women engaged in hi-tech pregnancy efforts, and even those
naturally produced by our own bodies - increases our risk of being
diagnosed with cancer, especially breast cancer. And many believe
that hormone-like chemicals - xenoestrogens - increasingly found in
our food and water, contribute to cancer as well. Doesn't that imply
that phytoestrogens will increase cancer risk too?
Virtually everything we eat - grains, beans, nuts, seeds, seed oils,
berries, fruits, vegetables, and roots - contains phytoestrogens.
Scientists measuring the amount of phytoestrogen break-down by-products
in the urine of healthy women found that those with the least were
four times more likely to be diagnosed with breast cancer than with
the most. Phytoestrogens actually appear to protect tissues from the
cancer-causing effects of xenoestrogens and other hormonal pollutants.
This seems simple - eat more phytoestrogens, be healthier - and it
is, so long as we restrict ourselves to eating plants. But when the
difference between food and medicine is disregarded, when phytoestrogens
are isolated and concentrated, sold to us in pills and candy bars,
then the equation changes: phytoestrogens become dangerous hormones,
quite capable of promoting cancer.
To get the greatest benefit from phytoestrogenic foods and herbs remember:
1. Isolated phytoestrogens are not as safe as those "in matrix."
2. To make use of plant hormones, you need active, healthy gut flora.
3. Herbs and foods rich in phytoestrogens need to be used in different
ways.
4. Phytoestrogens may have different effects on women who do not have
their ovaries.
1. Plants contain many types of phytoestrogens; additionally,
they contain minerals and other constituents which help our bodies modify
the phytoestrogens and so we can use them safely. Red clover, for instance,
is mineral-rich and contains all four of the major types of phytoestrogens:
lignans, coumestans, isoflavones, and resorcylic acid lactones. It is
the world's best-known anti-cancer herb. In general, foods and herbs
rich in phytoestrogens, with the possible exception of licorice, show
anti-cancer abilities. Isoflavone, however, when isolated (usually from
soy) has the opposite effect: in the lab it encourages the growth of
breast cancer cells (endnote 32 in New Menopausal Years).
2. Plant hormones, including most phytoestrogens, can't
be used by humans. But we can convert them into ones we can use - with
the help of our gut bacteria. When women take antibiotics, their excretion
of phytoestrogens plummets. Get your gut flora going by eating more
yogurt, miso, unpasteurized sauerkraut, homemade beers and wines, picked-by-your-own-hands-and-unwashed
fruits and salads, sourdough bread, and whey-fermented vegetables (see
Nourishing Traditions by Sally Fallon for whey-fermented vegetable recipes).
3. Plants which are exceptionally rich in phytoestrogens
are regarded as powerful herbal medicines. Plants which are good sources
of phytoestrogens are regarded as foods. While food can certainly be
our medicine - a practice I advocate - it is also true that medicines
are more dangerous than foods. Foods rich in phytoestrogens are different
than medicinal herbs rich in phytoestrogens. They have different places
in my life.
- I eat phytoestrogenic foods daily in quantity.
- I use phytoestrogenic food-like herbs regularly but not daily and
in moderate quantity.
- I take phytoestrogenic herbs rarely, usually in small amounts and
for a limited time.
Phytoestrogenic foods are the basis for a healthy diet and a long
life. The first food listed is the highest in phytoestrogens. The
best diet contains not just one but many choices from each list:
- Whole grains (rye, oats, barley, millet, rice, wheat, corn)
- Edible seeds (buckwheat, sesame, sunflower, pumpkin, amaranth,
quinoa)
- Beans (yellow split peas, black turtle beans, baby limas, Anasazi
beans, red kidney beans, red lentils, soy beans)
- Leafy greens and seaweed (parsley, nettle, kelp, cabbage, broccoli,
kale, collards, lamb's quarter)
- Fruits (olives, cherries, grapes, apples, pears, peaches, plums,
strawberries, blackberries, raspberries, salmon berries, apricots,
crab apples, quinces, rosehips, blueberries)
- Olive oil and seed oils
- Garlic, onions and their relatives leeks, chives, scallions, ramps,
shallot
The exceptions to the rule that plants don't contain human hormones:
- French beans, rice, apple seeds, licorice, and pomegranate seeds
contain the “weak” estrogen estrone.
Phytoestrogenic food-like herbs are generally considered longevity
tonics. For optimum effect, use only one from the list below and to
stick with it for at least three months:
- Citrus peel, dandelion leaves and/or roots, fenugreek seeds, flax
seeds, green tea, hops, red clover, red wine.
Phytoestrogenic herbs are usually too powerful for long-term use.
From the list below (which is in alphabetical order), it is safest
to use only one herb at a time, and use it only when needed, although
that may mean daily use for several months. More information about
these herbs, including specific dosages and cautions, is in New Menopausal
Years the Wise Woman Way.
- Agave root, black cohosh root, black currant, black haw, chasteberries,
cramp bark, dong quai root, devil's club root, false unicorn root,
ginseng root, groundsel herb, licorice, liferoot herb, motherwort
herb, peony root, raspberry leaves, rose family plants (most parts),
sage leaves, sarsaparilla root, saw palmetto berries, wild yam root,
yarrow blossoms.
4. Most of the warnings about phytoestrogenic herbs center on their
proven ability to thicken the uterine wall in animals who have had
their ovaries removed. This could encourage cancer, just as taking
ERT encourages cancer of the uterus by stimulating cell growth. Women
without ovaries are probably safe eating phytoestrogenic foods, but
may want to use phytoestrogenic herbs - especially ginseng, dong quai,
licorice, red clover, and wild yam - in small amounts and only for
short periods.
Phytoestrogens can be our friends. In a world that seems increasingly
hostile and threatening, green allies offer us ways to stay safe and
healthy, so long as we use them with wisdom and honor.
(This article is based on information in New Menopausal Years the
Wise Woman Way, available from www.wisewomanbookshop.com.)
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