Breastfeeding reduces risk of stroke in mothers: JAHA

Breastfeeding is not only beneficial for babies, a new study published in the Journal of the American Heart Association, has found that breastfeeding may also protect the woman from a stroke later in life.

Lisette T. Jacobson, assistant professor, University of Kansas School of Medicine, Kansas, U.S., and colleagues conducted the study to assess the association between breastfeeding and stroke and to determine whether this association differs by race and ethnicity.

This is among the first studies to examine breastfeeding and a possible relationship to stroke risk for mothers, as well as how such a relationship might vary by ethnicity.

According to the study, stroke is the fourth leading cause of death among women aged 65 and older and is the third leading cause of death among Hispanic and black women aged 65 and older.

“Some studies have reported that breastfeeding may reduce the rates of breast cancer, ovarian cancer, and risk of developing Type 2 diabetes in mothers. Recent findings point to the benefits of breastfeeding on heart disease and other specific cardiovascular risk factors,” said Jacobson.

Clinical Implications

    Breastfeeding along with other risk factors or risk markers during women’s reproductive years may be associated with stroke risk later in life. Identification of risk factors may help healthcare providers in assessing a woman’s risk profile.

    The medical and behavioral science communities may be better able to design culturally informed programs that mitigate stroke risk while they promote healthy lifestyle behaviors including breastfeeding among populations that unduly carry the largest health burden of stroke.

    Further investigation into the association and dose‐response relationship between breastfeeding and lower risk of stroke among postmenopausal women is warranted.

Researchers analyzed data on 80,191 participants in the Women’s Health Initiative observational study, a large ongoing national study that has tracked the medical events and health habits of postmenopausal women who were recruited between 1993 and 1998. All women in this analysis had delivered one or more children and 58 percent reported ever having breastfed. Among these women, 51 percent breastfed for one-six months, 22 percent for seven-12 months and 27 percent for 13 or more months. At the time of recruitment, the average age was 63.7 years and the follow-up period was 12.6 years.

Key Results:

    After adjusting for non-modifiable stroke risk factors (such as age and family history), researchers found stroke risk among women who breastfed their babies was on average:

         23 percent lower in all women

        48 percent lower in black women

        32 percent lower in Hispanic women

        21 percent lower in white women

        9 percent lower in women who had breastfed for up to six months.

“If you are pregnant, please consider breastfeeding as part of your birthing plan and continue to breastfeed for at least six months to receive the optimal benefits for you and your infant,” Jacobson said.

“Our study did not address whether racial/ethnic differences in breastfeeding contribute to disparities in stroke risk. Additional research should consider the degree to which breastfeeding might alter racial/ethnic differences in stroke risk,” Jacobson said.

Because the study was observational, it couldn’t establish a cause-and-effect relationship between breastfeeding and lower stroke risk, meaning that it is possible some other characteristic that distinguishes between women who breastfeed and those who don’t is the factor changing the stroke risk. However, because the Women’s Health Initiative is large, researchers were able to adjust for many characteristics, and the effects of breastfeeding remained strong, Jacobson said.

“Breastfeeding is only one of many factors that could potentially protect against stroke. Others include getting adequate exercise, choosing healthy foods, not smoking and seeking treatment if needed to keep your blood pressure, cholesterol and blood sugar in the normal range,” Jacobson said.

The study was also limited by the relatively small number of strokes that occurred during the follow-up period (just 3.4 percent of the women experienced a stroke during the study period and 1.6 percent reported having had a stroke prior to the study) and by the Women’s Health Initiative’s exclusion of women who had already had severe strokes at the time of recruitment.

Currently, the American Academy of Pediatrics and the World Health Organization recommend exclusive breastfeeding for six months, with the continuation of breastfeeding for one year or longer. For babies health, the American Heart Association recommends breastfeeding for 12 months with a transition to other additional sources of nutrients beginning at about four-six months of age to ensure sufficient micronutrients in the diet.

“Study results show an association and dose‐response relationship between breastfeeding and lower risk of stroke among postmenopausal women after adjustment for multiple stroke risk factors and lifestyle variables. Further investigation is warranted,” concluded the authors.

For more information follow the link: https://doi.org/10.1161/JAHA.118.008739

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