Is there any purpose of a menstrual period other than being able to have a baby?

Also a health sign: Regular menstrual periods also denote the status of a woman's helath in general. Morbidly obese, and anorexic women often do not have periods. Patient's post chemo or radiation therapy and hypothyroid patients also fall in that category. However, mother nature's # 1 priority with the menstrual cycle is to reproduce the population!