whom it may concern:
i believe that a vegetarian diet
with soy isoflavone in soy products is good for breast cancer.
isn't it that only estradiole and estrione are the only harmful estrogens
to breast cancer patients? and not estriole? please, check
that a vegetarian diet and soy can only maintain a weak and harmless
estriole in the body of a breast cancer patient.
i think we should concentrate
more on restricting hormone fed livestocks in breast cancer diets than
thank you for your attention
on the matter.
more power to your site.
a breast cancer patient from
I agree with your sentiments that trying to do things that will protect
our food supply would be energy wisely spent. With cancer prevention
is the best treatment. Unfortunately although there are a great
many things that might be implicated in causing cancer that could easily
be changed, little money or effort goes toward that. The vast
majority goes to treating cancer once it appears.
The science on meat consumption and cancer risk has been very confusing
in the past. Currently my feel is that it is not as simple as
a vegetarian diet protects against cancer and meat eaters get cancer.
I wish it was. Instead there are several factors involved;
a. diets high in meat that is overcooked drastically increase
cancer, especially breast cancer rates. Women for example who
prefer well done meat have 12 times the breast cancer rate as women
who prefer less cooked meat.
b. Vegetarians may eat more fruits and vegetables than meat eaters.
Consumption of fruits and vegetables plays a more significant role than
whether someone is a vegetarian or not.
c. Vegetarians frequently have lower B-12 status. This
is a risk for breast cancer.
The research on soy products and soy isoflavones is not clear.
Most arguments in favor of soy being protective against breast cancer
begin with the assumption that Japanese women get less breast cancer
because they eat soy. There are a number of other explanations
for their lower breast cancer incidence. For example, they start
menstruating at a later age, a clearly protective factor. They
eat more fish. They eat more fermented foods ( a risk factor for
gastric cancer but possibly protective against breast cancer).
The laboratory research on soy show a dual effect on breast cancer.
High concentrations of genestein slow breast cancer cell growth and
sound very exciting. Unfortunately at low concentrations, genestein
actually stimulates the growth of breast cancer cells. It appears
that even with the most conscientious oral consumption of soy products
it is impossible to raise tissue levels into the range where soy inhibits
breast cancer cell growth.
There are three main estrogens in human metabolism:
E1 and E2 are considered strong estrogens, having the greatest estrogen
effect and also stimulating cancer cell growth. There has been
a long standing theory that E3, estradiol is a weaker estrogen, and
might be protective against breast cancer by preventing the binding
of the strong stimulatory estrogens to breast cells. This theory
may hold for cancer prevention but it is not clear that it holds for
existing cancer. The idea has been around for years that soy will
also bind to the estrogen receptors and prevent estrogen effect.
The problem is that soy does appear to have enough estrogen like effect
that, again at low doses it stimulates breast cancer cells more than
it inhibits it.