Clinical Research Directory

Inclusion Criteria: * Person affiliated or entitled to a social security scheme * Person having received informed information on the study and having co-signed, with the investigator, a consent to participate in the study * female person * Person affiliated or entitled to a social security scheme * Over 18 years'old * Knowing how to read and write French * Patient diagnosed with anorexia nervosa according to DSM-5 criteria for at least 5 years (HAS criteria). Failure of prior outpatient or/and hospitalization care over the last 12 months: stable or falling low BMI, unmodified food restriction, continued fear of weight gain, disturbances in the perception of body image * BMI \< 18.5 kg/m² for volunteers in a state of constitutional thinness. The absence of eating disorder and the absence of restriction to DEBQ questionnaires. Fertility preserved. * For volunteers of normal weight: 18.5 kg/m² \< BMI \< 25 kg/m² Exclusion Criteria: * Pregnant women, parturient, nursing mothers; * Persons deprived of their liberty, hospitalized without consent, hospitalized for purposes other than research; * Minors * Refusal of the study by the participant * Person incapable of giving informed consent * Artificial nutrition * Associated organic damage favoring undernutrition: other chronic diseases (digestive, infectious, endocrine, pulmonary, cardiac, neurological), neoplasms, etc. * Abuse of psychoactive substances except tobacco * Characterized depressive episode, psychosis * Score less than 14 on the Edinburgh laterality questionnaire. * Contraindications to MRI or allergy to one of the components of the olfactory and taste tests * Smokers * Smell or taste alterations