older women who gained 20 to 30 pounds after high school graduation were 40 percent more likely to get breast cancer than women who kept the weight off. If the weight gain was more than 70 pounds, the risk was doubled. Lean post-menopausal women not taking hormone replacement therapy produce very little estrogen and had the lowest cancer risk in the study. Associate professor of surgery at Columbia University, Dr. Paul Tartter said, “The more fat you have—fat cells are capable of synthesizing estrogen—the heavier you are, the higher your estrogen levels. There’s no question that estrogen is the common denominator of most of our risk factors for breast cancer.”
