Our expert says:
Your training by itself is certainly not high enough in volume to cause amennhorea. It could be an interaction with diet - you'd need to assess that in order to fully understand what is happening. It's possible that the combination of diet and exercise is the problem, because it's not exercise alone - there are elite women who run 20km a day and they're OK, provided their diets are very good. The key is energy availability - a lot of women are quite undernourished, and that energy deficit affects the menstrual cycle.
I think you therefore need to consider seeing a gynaecologist, and have it looked at. it might be completely unreleated to running or diet, and so you need a medical opinion first, before taking any action.
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