From Susun Weed:
As the mix of hormones in your blood changes during your premenopausal years, you may notice the effects on your gastrointestinal tract both directly - estrogen is a gastrointestinal stimulant and varying levels may swing you from loose stools to dry ones - and indirectly, as the hormonal load places ever heavier demands on the liver. Hormones have a strong effect on the motility of the intestinal tract. When your levels of estrogen and progesterone change (as they do throughout menopause, during pregnancy, and before menstruation and birth), your bowel patterns change, too. Your liver is, among other things, a recycling center. It breaks down hormones circulating in the blood when they are no longer needed and makes their "parts" available for the production of more hormones. During the menopausal years some hormones (such as LH and FSH) are produced in such enormous quantities that your liver may struggle to keep up with its recycling work, and have little energy left over for digestive duties. Help yourself with these Wise Woman Ways.