Missing Periods

I haven't had my period in a little over 3 months. I know I am not pregnant, but still haven't gotta it. I'm not anorexic.. My BMI is 25. I have however lost 50-52 lbs since November. Wondering if anybody can explain what's going on, and what to do. Although I don't want to have to eat more, since I'm still trying to loose the weight!

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