Serotonin Role on Brain Circuits Involved in Food Avoidance in Anorexia Nervosa

Common Criteria for inclusion : * Signature of written consent * Subject affiliated or entitled to a social security scheme Inclusion Criteria: Patients with restrictive anorexia nervosa (30 subjects). * Anorexia nervosa common features : fear of weight gain, dysmorphophobia, BMI \< 17.5 kg/ m², amenorrhea * Absence of food compulsions and purges * Subgroup 1 (15 subjects) : STAI Y2 anxiety score \> 61 * Subgroup 2 (15 subjects) : STAI Y2 anxiety score \< 51 Inclusion criteria - Female control subjects (15 subjects) * BMI between 18.5 and 25 kg/ m² * Absence of a psychological profile of eating disorder or other psychiatric disorders. Exclusion Criteria: * Subjects with an oral contraception and breastfeeding woman * Subject with heart failure * Subject treated during the last three months with neuroleptics, and antiparkinsonian drugs, monoamine oxidase (MAO)-A or monoamine oxidase (MOA)-B inhibitors, tricyclic antidepressants, 5HT reuptake inhibitors, thymo regulators (lithium), antiepileptic dugs, codeine derivatives, morphinics, tramadol-containing products (Topalgic, …),dopaminergic drugs. * Subjects with suspected pregnancy; Test β human chorionic gonadotropin (HCG) positive prior to examination. * Subjects for whom MRI is contraindicated (pacemaker, intracerebral clips, prosthesis made of ferromagnetic material or claustrophobia). * Subjects unable to sign written consent for participation in the study. * Subject deprived of liberty by a judicial or administrative decision