The Evolutionary Ecology of Age at Natural Menopause: Implications for Public Health

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1017/ehs.2020.59. This is version 4 of this Preprint.

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Authors

Abigail Fraser, Elise Whitley, Cathy Johnman, Alex Alvergne

Abstract

Evolutionary perspectives on menopause have focused on explaining why early reproductive cessation in females has emerged and why it is rare throughout the animal kingdom, but less attention has been given to exploring patterns of diversity in age at natural menopause. In this paper, we aim to generate new hypotheses for understanding human patterns of diversity in this trait, defined as age at final menstrual period. To do so, we develop a multi-level, inter-disciplinary framework, combining proximate, physiological understandings of ovarian ageing with ultimate, evolutionary perspectives on ageing. We begin by reviewing known patterns of diversity in age at natural menopause in humans, and highlight issues in how menopause is currently defined and measured. Second, we consider together ultimate explanations of menopause timing and proximate understandings of ovarian ageing. We find that ovarian ageing is highly constrained by ageing of the follicle - the somatic structure containing the oocyte - suggesting that menopause timing might be best understood as a by-product of ageing rather than a facultative adaptation. Third, we investigate whether the determinants of somatic senescence also underpin menopause timing. We show that diversity in age at menopause can be, at least partly, explained by the genetic, ecological and life-history determinants of somatic ageing. The public health implications of rethinking menopause as the by-product rather than the catalyst of biological ageing are discussed.

DOI

https://doi.org/10.32942/osf.io/s59rh

Subjects

Comparative and Evolutionary Physiology, Ecology and Evolutionary Biology, Life Sciences, Medicine and Health Sciences, Other Ecology and Evolutionary Biology, Other Medicine and Health Sciences, Other Social and Behavioral Sciences, Physiology, Social and Behavioral Sciences

Keywords

Age at menopause, Biocultural, life-history, Medical anthropology, Menopause, Ovarian ageing, Reproductive cessation, Somatic ageing

Dates

Published: 2020-02-11 19:48

Last Updated: 2020-11-07 17:21

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License

CC-By Attribution-ShareAlike 4.0 International