A 16-year-old female presents with dizziness, cold intoleran…
A 16-year-old female presents with dizziness, cold intolerance, and a 20-pound weight loss over the past 4 months. Her BMI is 15.8. She denies binge eating but reports extreme dietary restriction due to fear of weight gain. On exam, her heart rate is 48 bpm and BP is 88/56. Which diagnosis is most consistent with these findings?