Energy balance
Low energy availability, rather than the physical or psychological stress of exercise itself, causes exercise-induced amenorrhea, and this dysfunction can be reversed by increasing caloric intake while maintaining the exercise regimen.
If you are experiencing menstrual irregularities or amenorrhea due to strenuous exercise, the primary driver is likely low energy availability (not eating enough for your activity level). The solution is to increase your caloric intake significantly (often requiring 400+ extra calories daily) while maintaining your current exercise routine. This should restore hormonal balance and menstruation within weeks, confirming that energy deficit, not exercise stress, was the cause.
These data provide strong evidence that low energy availability plays a causal role in the development of exercise-induced amenorrhea.
Why this rating
Longitudinal primate model with controlled randomization, precise caloric measurement, and reversal of symptoms via intervention.
Source
Evidence for a Causal Role of Low Energy Availability in the Induction of Menstrual Cycle Disturbances during Strenuous Exercise Training
Nancy I. Williams et al. · The Journal of Clinical Endocrinology & Metabolism · 2001
DOI 10.1210/jcem.86.11.8024
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