There is a new very large study of 70,000 women that is making health headlines today that shows that drinking alcohol, especially fairly heavy drinking will increase a womens risk of breast cancer. How much is fairly heavy drinking? The study shows that three or more drinks a day will increase the chance of developing breast cancer by 30% over that of non drinkers.

All types of alcohol — wine, beer or liquor — add equally to the risk of developing breast cancer in women, American researchers said Thursday.

“This is a hugely underestimated risk factor,” said Dr. Patrick Maisonneuve, head of epidemiology at the European Institute of Oncology in Italy, who was not connected to the study.

The researchers, led by Dr. Arthur Klatsky of the Kaiser Permanente Medical Care Program in Oakland, Calif., revealed their findings at a meeting of the European Cancer Organization in Barcelona.

Researchers analyzed the drinking habits of 70,033 women of various races and asked them questions during health exams between 1978 and 1985. By 2004, 2,829 of these women had been diagnosed with breast cancer.

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