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A 14 year old girl is brought in by her parents because of concerns that she is “too thin.” The girl feels that she is not too thin (and, if anything, is a little “chubby”), and that she eats plenty, but says she tries to eat “healthy.” Per her parents, she exercises 2 hours per day. Vital signs in the ED are: temperature 95.8 oral, HR 55, RR 18, BP 88/40. Her BMI is 15, and her weight is 73% of her ideal body weight. Her mental status is normal. Her capillary refill is < 2 seconds. An ECG is performed and is normal.