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All postmenopausal women should try to keep insulin at normal levels through weight loss, regular exercise and other methods. Postmenopausal women with elevated insulin levels are at higher risk of developing breast cancer.As per a report published in the International Journal of Cancer from Researchers at Albert Einstein College of Medicine of Yeshiva University in New York City, there is a strong association between elevated insulin levels in the blood and increased risk of breast cancer. The researchers examined data on 5,450 women who took part in the Women’s Health Initiative and found that women with insulin levels in the highest third were twice as likely to develop breast cancer as women in the bottom third.The link between elevated insulin levels and breast cancer was stronger for thin women than for obese women, who tend to have higher insulin levels. This finding is potentially important because it indicates that, in postmenopausal women, insulin may be a risk factor for breast cancer that is independent of obesity.