Scientists reporting in the journal of clinical oncology say all it takes is to stay at a normal weight, avoid smoking, and drink in moderation.
The research from the Fred Hutchinson Cancer Center in Seattle suggests that smoking and drinking too much are all risk factors for breast cancer in the opposite breast of women who've already had an estrogen receptor positive invasive breast cancer.
That's because estrogen can fuel a tumor's growth, and both fat tissue and excessive alcohol use directly increase estrogen levels.
