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My understanding is that a lost period is a result from rapid changes in diet (specifically, a rapid drop in calories) or exercise. Specifically, it stems from a rapid change in the energy available to the body OR in situations where body fat drops too low. Originally Posted by aka8941
Has anyone else had their period go MIA when they started running/losing weight? (I'm not preggers) just fyi. but yeah, I guess I just skipped one? This happened last time I started running too. Any thoughts?
While some believe the C25K program progresses a bit quickly in terms of potentially risking joint injury, it's a very reasonably-paced program in terms of moving slowly from walking to jogging and gradually increasing time.
Are you doing really intensive training on top of C25K? Are you eating proper calories for your height/weight/activity level?
It could be worth seeing a doctor if you've started missing periods. Good luck!


