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This post deals with eating disorders and exercise addiction and might be triggering for some readers.
My obsession with distance running began when I was 11 and continued into my 30s.
My period became irregular in my late 20s, and by the time I was 31 it had vanished.
The technical term for your periods stopping is amenorrhea, and a common cause for this is Relative Energy Deficiency Syndrome (RED-S). RED-S occurs when there’s an imbalance between a person’s energy input and energy output - this results in less energy to support normal physiological functioning, like menstruation.