Medical intervention in human birth is now so widespread in industrialized countries that deliveries are seldom spontaneous. Yet with no intervention there is clear persistence of a general mammalian 24-hour biorhythm in birth hour. Is this just a carryover from ancestors that gave birth during their inactive period, or is that basic rhythm still biologically important?
Every month, women face a recurring cycle that can throw our bodies out of whack and make some of us suffer in many ways. Not only can the ovarian hormones that drive the menstrual cycle makes us emotional, but they may be flipping switches on the genes that make some women more vulnerable to eating disorder symptoms.
If you are a woman anywhere near 50, you either just went through menopause or you are going to go through it within the next five years. How is that going to affect your sex life? And how will you respond chemically to new love affairs and breakups?