Editing Menstruation (section)

==== Effects of the moon ====
{{see also|Lunar effect}}
Even though the average length of the human [[menstrual cycle]] is similar to that of the [[lunar cycle]], in modern humans there is no relation between the two.<ref>{{cite book|url=https://books.google.com/books?id=F_NaW1ZcSSAC&pg=PA361|title=Vertebrate Endocrinology|date=2013|publisher=Academic Press|isbn=9780123964656|edition=5|page=361}}</ref> The relationship is believed to be a coincidence.<ref>{{cite book| vauthors = Gutsch WA |title=1001 things everyone should know about the universe|date=1997|publisher=Doubleday|isbn=9780385482233|edition=1st|location=New York|page=57 }}</ref><ref>{{cite book| vauthors = Barash DP |title=How women got their curves and other just-so stories evolutionary enigmas|date=2009|publisher=Columbia University Press|isbn=9780231518390|edition=[Online-Ausg.].|location=New York|chapter=Synchrony and Its Discontents|chapter-url=https://books.google.com/books?id=fZM2AAAAQBAJ&pg=PT64 }}</ref> Light exposure does not appear to affect the menstrual cycle in humans.<ref name="Kris2013">{{cite book| vauthors =  Lopez KH |url=https://books.google.com/books?id=M4kEdSnS-pkC&pg=PA53|title=Human Reproductive Biology|date=2013|publisher=Academic Press|isbn=9780123821850|page=53|archive-url=https://web.archive.org/web/20150621165031/https://books.google.ca/books?id=M4kEdSnS-pkC&pg=PA53|archive-date=21 June 2015|url-status=live|df=dmy-all}}</ref> A meta-analysis of studies from 1996 showed no correlation between the human menstrual cycle and the lunar cycle,<ref>{{cite web | vauthors = Adams C | date = 24 September 1999 | work = The Straight Dope | url = http://www.straightdope.com/classics/a990924.html | archive-url = https://web.archive.org/web/20060615102004/http://www.straightdope.com/classics/a990924.html | archive-date = 15 June 2006 | title = What's the link between the moon and menstruation? | access-date = 6 June 2006 }}: {{cite book| vauthors = Abell GO, Singer B |title=Science and the Paranormal: Probing the Existence of the Supernatural|publisher=Scribner Book Company|year=1983|isbn=978-0-684-17820-2|author-link=George Ogden Abell|name-list-style=vanc}}</ref> nor did data analyzed by period-tracking app Clue, submitted by 1.5{{nbsp}}million women, of 7.5{{nbsp}}million menstrual cycles; however, the lunar cycle and the average menstrual cycle were found to be basically equal in length.<ref name="Clue">{{cite web|date=3 December 2018|title=The myth of moon phases and menstruation|url=https://helloclue.com/articles/cycle-a-z/myth-moon-phases-menstruation|access-date=3 December 2018|publisher=Clue|archive-date=30 November 2018|archive-url=https://web.archive.org/web/20181130164547/https://helloclue.com/articles/cycle-a-z/myth-moon-phases-menstruation|url-status=live}}</ref>