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May
16
comment Evolutionary origin and exogenous cues of ~28 day infradian rhythm?
@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.