Study shows negative effect of high fertility on women’s longevity

By Arya M Nair, Official Reporter
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Pregnancy affects women's longevity
Rep.Image | Courtesy: Pavel Danilyuk/Pexels

A research, carried out among 1735 young people in the Philippines, has shown that women who reported having been pregnant looked biologically older than women who had never been pregnant, and women who had been pregnant more often looked biologically older than those who reported fewer pregnancies, according to a new study from the Columbia University Mailman School of Public Health.

Notably, the number of pregnancies fathered was not associated with biological aging among same-aged cohort men, which implies that it is something about pregnancy or breastfeeding specifically that accelerates biological aging. The findings are published in The Proceedings of the National Academy of Sciences.

This study builds on epidemiological findings that high fertility can have negative side effects on women’s health and longevity. What was unknown, however, was whether the costs of reproduction were present earlier in life, before disease and age-related decline started to become apparent.

Until now, one of the challenges has been quantifying biological aging among the young. This challenge was overcome by using a collection of new tools that use DNA methylation (DNAm) to study different facets of cellular aging, health, and mortality risk. These tools, called ‘epigenetic clocks’ allow researchers to study aging earlier in life, filling a key gap in the study of biological aging.

Calen Ryan_Pregnancy accelerates biological aging
Calen Ryan
Ph.D., Lead Author,
Associate Research Scientist,
Columbia Aging Center

“Epigenetic clocks have revolutionized how we study biological aging across the life course and open up new opportunities to study how and when long-term health costs of reproduction and other life events take hold. Our findings suggest that pregnancy speeds up biological aging, and that these effects are apparent in young, high-fertility women. Our results are also the first to follow the same women through time, linking changes in each woman’s pregnancy number to changes in her biological age.”

The relationship between pregnancy history and biological age persisted even after taking into account various other factors tied to biological aging, such as socioeconomic status, smoking, and genetic variation, but were not present among men from the same sample. This finding, noted Ryan, points to some aspect of bearing children, rather than sociocultural factors associated with early fertility or sexual activity, as a driver of biological aging.

“Many of the reported pregnancies in our baseline measure occurred during late adolescence, when women are still growing. We expect this kind of pregnancy to be particularly challenging for a growing mother, especially if her access to healthcare, resources, or other forms of support is limited,” Ryan also added.

Ryan also acknowledged that there is more work to do. “We still have a lot to learn about the role of pregnancy and other aspects of reproduction in the aging process. We also do not know the extent to which accelerated epigenetic aging in these particular individuals will manifest as poor health or mortality decades later in life,” he further stated.

Ryan said that our current understanding of epigenetic clocks and how they predict health and mortality comes largely from North America and Europe, but that the aging process can take slightly different forms in the Philippines and other places around the world. “Ultimately I think our findings highlight the potential long-term impacts of pregnancy on women’s health, and the importance of taking care of new parents, especially young mothers.”

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