Breast cancer is the most common cause of death in women. In a most recent cancer study, researchers announced that cancer costs the global economy nearly $900 billion a year—more than any other cause of death. The study also said that breast cancer is among the costliest forms of the disease, particularly in high-income countries, such as the United States. There may be many causes of breast cancer, one of which is a link to having too much estrogen (female hormone manufactured by the ovaries in women and in small amounts by the testicles in men) in the body. During menstruation, as well as in the latter part of each menstrual cycle, women often experience high estrogen levels. Increased estrogen may over stimulate cell growth in the breast as much as four times, and any excess of estrogen may increase the risk of cancer by stimulating cell growth in the breasts, ovaries and uterus in women. Cells dividing too rapidly may pose a risk of a genetic accident, resulting in alteration in the genetic structure of cells in the breast.

Accordingly, reducing estrogen may reduce a woman’s risk of breast cancer. The question is: How to reduce the estrogen level in a woman’s lifespan? The risk of breast cancer is significantly lower in Japan than that in the United States—about one-fourth. This discrepancy can be explained by the fact that the menstrual cycle of women in the United States is approximately 26 to 29 days, compared to the average of 32 days for women in Japan. So, the length of the menstrual cycles may hold the key to reducing cancer risk in women, because the shorter the menstrual cycles, the less production of estrogen, and the lower the cancer risk.

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