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Dec 9 '12 at 20:19 comment added Zewz @MatthewPiziak: correct me if I'm wrong, but isn't there a third possibility as well - that the lunar cycle affects something which is the causation of the human menstrual cycle. nico - I have no idea about the cycles of other relative close ancestors to us (ie primates), but do you know if they deviate substantially from the human cycle?
May 16 '12 at 15:10 comment added nico then why would it only work for humans and not for other primates?
May 16 '12 at 13:23 comment added Matthew Piziak @nico Well, if they are correlated but lunar cycles do not affect menstrual cycles, then there are two other possibilities. Either menstrual cycles affect lunar cycles, or a confounding factor affects both lunar cycles and menstrual cycles. Neither of these seem very likely. Additionally, we know that light exposure seems to have some effect on cycle length.
May 16 '12 at 6:41 comment added nico There seems to be some data suggesting that the two are correlated. As to causation I think we're not even close to prove that.
May 16 '12 at 3:06 history answered Matthew Piziak CC BY-SA 3.0