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2002 JAN 24 - (NewsRx.com & NewsRx.net) -- A unique study of breast cancer mortality rates and dietary factors for 35 countries presents strong evidence that diet is the most important risk factor for breast cancer.
Specifically, the data from the study shows that the fraction of daily calories derived from animal products exhibits a very strong correlation with increased mortality by this cancer, while the fraction derived from vegetable products shows an equally strong correlation with a decreased mortality.
This new study finally solves the mystery of why almost all such correlation type studies find a very strong link between dietary fat and the incidence of breast cancer, while other types of cancer studies, such as those involving case-control or the examination of cohorts do not show this effect.
The increase is due to the fact that those females living in countries with high-fat diets generally eat a higher fraction of animal products, drink more alcoholic beverages, and eat less fish (a source of vitamin D) than those women living in countries with low-fat diets. Thus, over their lifetime, they produce more estrogen and more insulin-like growth factor (IGF-1). Both of these compounds are known to be strong factors associated with increased risk of breast cancer, and alcohol increases the effects of estrogen.
The study, published January 1, 2002, in the journal Cancer also confirms surprising ...