More calories are burned right before the period instead of the week it is actually occurring. If more exercises are performed while the period is occurring, more calories may be burned.
Women’s hormone levels change during their menstrual cycle, and this has an impact on their metabolism. When women start the luteal phase of the menstrual cycle, the energy required for their metabolic processes increases by 9 percent. The luteal phase begins about two weeks before the period begins and lasts for 14 days. The increase in appetite during this time period is a sign from the body that it needs additional energy for metabolism.