My first insight
would be that eating hormone free beef is not really protective
against breast cancer. To the extent that hormones contribute to
breast cancer, beef is beef and will still contain the animal's
own endogenous hormones. Some of the protein hormones are destroyed
by digestion but the sterol hormones are not. It is possible that
the decline in your menopausal symptoms was due to eating hormone-free
beef, however menopausal symptoms decrease with time anyway so an
important question would be whether they came back when you returned
to the US.
The first graph
at http://www.vegsource.com/harris/b_cancer.htm (and also at http://www.vegsource.com/harris/cancer_vegdiet.htm)
indicates that animal source Calorie consumption has the highest
correlation with breast cancer. In other words, the more animal
source food one eats the higher the risk for breast cancer. The
multiple regression table at the bottom of the breast cancer article
indicates that of the dietary and environmental factors for which
I was able to find data most of the other risk factors were also
animal source nutrient intake of one kind or another.
literature is wildly conflicted on the subject of diet and breast
cancer. I append an affirmative study, however I have 81 pages of
references and some show just the opposite. In the absence of a
final decision, game theory dictates the wisest choice.
If in fact diet
is not a risk factor for breast cancer and one goes to a wholefood
vegan diet anyway nothing has been lost since it's more than nutritionally
adequate and offers other health, environmental, and ethical advantages.
If, on the other
hand, one continues as an omnivore and the future final judgment
is that diet really does affect breast cancer risk, then a serious
error has been made.
AND THE RISK OF BREAST-CANCER - A PROSPECTIVE-STUDY OF 25,892 NORWEGIAN
GAARD M, TRETLI S, LOKEN EB
INTERNATIONAL JOURNAL OF CANCER
63: (1) 13-17 SEP 27 1995
this prospective study, the relationship between energy acid fat
consumption and the risk of breast cancer was examined. Between
1977 and 1983, 31,209 Norwegian women, 20 to 54 years of age attended
a health screening. The attendees were given a food-frequency questionnaire
to be completed at home, and this was returned by 25,892 (83%).
During the 7 to 13 years of follow-up, 248 cases of breast cancer
were identified for analysis by linkage to the Norwegian Cancer
Registry. The relative risk of women who ate meat more than 5 times
a week, as compared with those who consumed meat twice or less than
twice a week, was 2.44. Consumers of 0.75 litres or more of full-fat
milk daily had a relative risk of 2.91 compared with those who consumed
0.15 litres or less. A positive relationship was found between those
reporting the highest quartile of monounsaturated fat consumption
and the risk of breast cancer. The main foods contributing to the
mono-unsaturated fat index were edible fats, meat and milk. (C)
1995 Wiley-Liss, Inc.