5 little-known facts about your period

22. Your period can cause an iron deficiency.

Losing all that blood means losing all that iron. You may also feel so rotten and fatigued, you don’t bother ironing your clothes.

23. You need a little bit of body fat in order to menstruate.

If your body fat plummets below 8-12%, your period will abruptly cease, if it ever began at all. Fat cells are correlated with a woman’s estrogen levels and are thus necessary in both menstruation and procreation.