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Breastfeeding Moms Lower Diabetes Risk

Study Shows 15% Risk Reduction for Each Year of Lactation
WebMD Health News
Reviewed by Louise Chang, MD

Nov. 22, 2005 -- Women who breastfeed may also be lowering their risk of developing type 2 diabetes, new research suggests.

Breastfeeding conveys clear health benefits for babies, and there is mounting evidence that it does the same for moms. The study found that the longer a woman breastfed, the lower her chances were for developing diabetes.

Each year of breastfeeding was associated with a 15% reduction in diabetes risk within the next 15 years, researchers reported.

A woman with two children could potentially lower her risk of developing type 2 diabetes by almost a third by following the advice of child health experts and breastfeeding each child for a year, researcher Alison M. Stuebe, MD, tells WebMD.

The study is published in the Nov. 23/30 issue of The Journal of the American Medical Association.

"The nice thing about this is that there is no downside to breastfeeding," says Stuebe, who is an ob-gyn and maternal medicine researcher at Boston's Brigham and Women's Hospital. "It is clearly good for babies, and this study and others suggest that it is good for moms, too."

Lactation has also been shown to improve blood sugar control, which drives diabetes risk. But the long-term impact of breastfeeding on diabetes risk has not been known.

In the newly published research, Stuebe and colleagues at Harvard Medical School's Brigham and Women's Hospital analyzed data on close to 160,000 female nurses enrolled in two ongoing health studies. All of the women had provided information on their breastfeeding history, and roughly 6,200 developed type 2 diabetes.

After controlling for obesity, smoking, sedentary lifestyle, and other type 2 diabetes risk factors, having breastfed within the past 15 years was found to be strongly protective against the disease. The longer a woman breastfed the stronger the protection. But the benefits did not appear to extend to older women whose last birth was more than 15 years past. Women with a history of gestational diabetes (diabetes during pregnancy) had an increased risk for developing type 2 diabetes. However, lactation did not have an effect on this risk.

The researchers conclude that other clinical studies are needed to confirm the findings and to better understand why lactation may help protect against diabetes.

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