I'm bulimic but i'm 5'3" and 78lbs. i'm losing weight from it. but binge and purge only at night 200 cal in the day. i thought bulimia was overweight?

Anorexia Nervosa: You may have anorexia nervosa, binge-eating/purging type. In any case, your weight and consequently your BMI (body mass index) are severely out of the normal range. Eating 200cal/day will cause you serious medical problems, if not now, in the near future. Please ask your parents to take you to see your pediatrician and a child psychiatrist ASAP. This is urgent!

Not about weight: Please seek medical advice to make sure you are stable. From your symptoms you may have a subtype of anorexia that involves purging. People who are bulimic may be underweight, normal or overweight. It is a pattern of behavior and attitude towards food/weight that cannot be measured by weight. Anorexia is extremely dangerous. I highly recommend a thorough medical work-up to ensure your health.