CARTA: Is There a Point to Periods? The Evolutionary History of Menstruation and Implications of Women's Health with Deena Emera

Menstruation is the cyclical shedding of the endometrium triggered by falling progesterone levels. Menstruation is a rare trait found in less than 2% of mammals and likely evolved independently at least 4 times. Why do some mammals menstruate while most do not? The leading hypothesis is that menstruation occurs as a nonadaptive consequence of spontaneous decidualization of the endometrium, which evolved to increase biosensoring of embryo quality. While the trait of spontaneous decidualization (and as a byproduct, menstruation) was likely shaped by natural selection, menstruation also disposes women to conditions such as endometriosis, pre-menstrual syndrome, and bleeding disorders, especially in the contemporary context. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Health and Medicine] [Humanities] [Science] [Show ID: 40693]