According to a new study postmenopausal women with elevated insulin levels may be at higher risk of developing breast cancer reported researchers at Albert Einstein College of Medicine of Yeshiva University in New York City.

Geoffrey Kabat, the lead author and senior epidemiologist in the department of epidemiology and population health at Einstein said, "Up to now, only a few studies have directly investigated whether insulin levels are associated with breast cancer risk.

Our study involved analyzing repeated measurements of insulin taken over several years -- which provides a more accurate picture of the possible association between insulin levels and breast cancer risk."

Published in the International Journal of Cancer, the study was based on data on 5,450 women who took part in the Women’s Health Initiative, a large study that looked at how various factors influence women’s health.

The researchers reported that they found 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 said the team.

In a news release Kabat said, "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."

Kabat recommended that postmenopausal women try to keep insulin at normal levels through weight loss, regular exercise and other methods.