Inclusion Criteria:  Female Age at least 18 and not over 40 BMI at or above 18.5 kg/m2 Speaks English Medically stable, as cleared by a licensed physician, with vital signs and initial blood draws History of DSM-5 diagnosis of Anorexia Nervosa (WR-AN only) Weight-restored from underweight BMI (under 18.5 kg/m2) within the past 6 months (WR-AN only)  Exclusion Criteria:  Current/lifetime diagnosis of DSM-5 psychotic disorders, bipolar disorders Active DSM-5 substance use disorders  On medications that could affect metabolism  *Subjects are to be free of any medications that could affect metabolism, as discussed with study physician, for 2 weeks prior to primary study visit for glucose function testing.  History of suicide attempt within previous 6 months or acute suicide risk Significant current medical illness or metabolic conditions, including diabetes mellitus and pregnancy Current/lifetime diagnosis of DSM-5 eating disorders (HC only) Active DSM-5 depressive disorders (HC only)