Why do distance runners lose their period

Why do distance runners lose their period

http://www.chacha.com/question/why-do-distance-runners-lose-their-period

Amenorrhea is the medical term which refers to a prolonged absence menstruation during the reproductive years of a. MORE?

Is it okay to not have menstrual periods if I’m a distance runner…?

http://answers.yahoo.com/question/index?qid=20080715231539AAvJn70

well it depends if you run or exercise too much and you’re too skinny then your body don’t have enough body fats therefore your body isn’t prepare to have a baby therefore the body stops you from having your periods in other word being able…