What causes a menstrual cycle to change?
Darkness may be one of the biggest reasons menstrual cycles become irregular. Women who live near the equator or in sunny regions are more fertile and have stronger and more regular menstrual patterns than women who live in northern regions or spend more time indoors. Also, menstrual cycles during the darker winter months are longer than in the summer. Irregularity may also be caused by stress, too much exercise, illness or weight problems. Low body weight can prevent ovulation because the body needs a minimum amount of body fat. Being overweight is linked to irregular cycles and heavy bleeding. Because of health concerns, you should consult with your doctor if you experience irregular menstrual cycles. Restoring regular cycles Knowing that healthy periods are in sync with the lunar cycle, scientists use artificial moonlight to regularize erratic menstrual cycles. Several studies show that using light at night regulates irregular and longer menstrual cycles, even in women whose periods
