Breast Cancer and Progesterone Link

A meta study of the available evidence has pointed to a strong link between raised levels of progesterone and the eventual development of breast cancer.  Researchers found that analysis of progesterone levels of women aged between 25-35 five to nine days before their next period showed an increase of more than 70%. They also found that this coincided with a more than eightfold rise in breast cancer rates.  They concluded by saying that the levels may also be affected by the higher calorie intake common at this time and that an increase in physical activity and a decrease in calorific intake might be beneficial.
(British Medical Journal; 2001; 322; pp 586-7)

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