If your percent body fat drops too low, your cycles can stop. This isn't very healthy long-term. They've found women athletes even in their 20's who end up with osteroperosis since they didn't realize that their cycles helped protect their bones. However, if you're just talking about a couple cycles, it isn't a super big deal. I have a percent body fat scale and know what number makes my periods stop. (The scale isn't 100% accurate, but the same number corrolated with my cycles). I normally tried to keep my body fat up enough and then let it dip 2 months or less before the race. After a marathon, I give my body a break and make sure to get my body fat right back up.
Right now, my body fat is too low to have cycles. However, my marathon is next month, so I'm fine with it. Also, I'm breastfeeding, so I'm not sure if I would ovulate anyways!
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