Breastfeeding Decreases Mothers’ Heart Disease Risk

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The health benefits of breastfeeding for children are well known. According to the World Health Organization (WHO), it is linked with fewer respiratory infections and lower risk of death from infectious diseases among the children who were breastfed. Breastfeeding also has been linked to maternal health benefits, including lower risk for Type 2 diabetes, ovarian cancer and breast cancer.

“Previous studies have investigated the association between breastfeeding and the risk of cardiovascular disease in the mother; however, the findings were inconsistent on the strength of the association and, specifically, the relationship between different durations of breastfeeding and cardiovascular disease risk. Therefore, it was important to systematically review the available literature and mathematically combine all of the evidence on this topic,” said senior author Peter Willeit, M.D., M.Phil., Ph.D., professor of clinical epidemiology at the Medical University of Innsbruck in Innsbruck, Austria.

Researchers reviewed health information from eight studies conducted between 1986 and 2009 in Australia, China, Norway, Japan and the U.S. and one multinational study.

The review included health records for nearly 1.2 million women (average age 25 at first birth) and analyzed the relationship between breastfeeding and the mother’s individual cardiovascular risk.

“We collected information, for instance, on how long women had breastfed during their lifetime, the number of births, age at first birth and whether women had a heart attack or a stroke later in life or not,” said first author Lena Tschiderer, Ph.D., a postdoctoral researcher at the Medical University of Innsbruck.

The review found:

82% of the women reported they had breastfed at some time in their life.

Over an average follow-up period of 10 years, women who breastfed at some time in their life were 14% less likely to develop coronary heart disease; 12% less likely to suffer strokes; and 17% less likely to die from cardiovascular disease.

Women who breastfed for 12 months or longer during their lifetime appeared to be less likely to develop cardiovascular disease than women who did not breastfeed.

There were no notable differences in cardiovascular disease risk among women of different ages or according to the number of pregnancies.

Despite recommendations to breastfeed by organizations including the WHO and the U.S. Centers for Disease Control and Prevention (CDC), both of which recommend babies are breastfed exclusively through at least six months of age, only 1 in 4 infants receives only breastmilk for the first six months of life. Black infants in the U.S. are less likely than white infants to be breastfed for any length of time, according to the CDC.

“It’s important for women to be aware of the benefits of breastfeeding for their babies’ health and also their own personal health,” Willeit said. “Moreover, these findings from high-quality studies conducted around the world highlight the need to encourage and support breastfeeding, such as breastfeeding-friendly work environments, and breastfeeding education and programs for families before and after giving birth.”

The U.S. has the highest maternal death rate among developed countries, and cardiovascular disease is the leading cause, according to the 2021 Call to Action Maternal Health and Saving Mothers policy statement from the American Heart Association. The statement, which outlines public policies that address the racial and ethnic disparities in maternal health, notes that an estimated 2 out of 3 deaths during pregnancy may be preventable.

“While the benefits of breastfeeding for infants and children are well established, mothers should be further encouraged to breastfeed their infants knowing that they are improving the health of their child and improving their own health as well,” said Shelley Miyamoto, M.D., FAHA, chair of the American Heart Association’s Council on Lifelong Congenital Heart Disease and Heart Health in the Young (Young Hearts), the Jack Cooper Millisor Chair in Pediatric Heart Disease and director of the Cardiomyopathy Program at Children’s Hospital Colorado in Aurora. “Raising awareness regarding the multifaceted benefits of breastfeeding could be particularly helpful to those mothers who are debating breast vs. bottle feeding.

“It should be particularly empowering for a mother to know that by breastfeeding she is providing the optimal nutrition for her baby while simultaneously lowering her personal risk of heart disease.”

A limitation of this meta-analysis is that little information was available about women who breastfed for longer than two years. “If we had this additional data, we would have been able to calculate better estimates for the association between lifetime durations of breastfeeding and development of cardiovascular disease in mothers,” Tschiderer said.

Co-authors are Lisa Seekircher, M.S.; Setor K. Kunutsor, M.D., Ph.D.; Sanne A. E. Peters, Ph.D.; and Linda M. O’Keeffe, Ph.D.

The Austrian Science Fund funded this study.

Source: Eurekalert



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