Confirming the Efficacy/Mechanism of Family Therapy for Children With Low Weight ARFID

Inclusion Criteria: * Children meeting DSM-V criteria for ARFID * Children between the ages of 6 to 12 years old, living with their families * Medically stable for outpatient treatment according to the recommended thresholds of the American Academy of Pediatrics and the Society of Adolescent Medicine. * Not engaging in another individual or family-based psychotherapy trial during the duration of treatment sessions in the study. * Less than 4 sessions of FBT * If taking medication for co-morbid disorders, participants must be on a stable dose of medication for 8 weeks (2 months) before participating. If the participant is on a new medication at baseline, but is discontinuing the medication in order to start the study, they must have discontinued the medication before beginning treatment. * EBW between 75% and 88%. * Able to fluently speak and read English Exclusion Criteria: * Current physical, psychotic illness or other mental illness requiring hospitalization * Current psychotic illness or mental retardation or other mental illnesses that would prohibit the use of psychotherapy * Current dependence on drugs or alcohol * Physical conditions (e.g. diabetes mellitus, pregnancy) known to influence eating or weight * Any medical complications or severe mental disorder (psychosis, low-functioning Autism) that may reduce compliance with the study procedures or require more intensive care to manage the symptoms * 4 or more sessions of FBT * Currently taking medication for co-morbid disorders that cannot be safely discontinued or prescribed for less than 2 months * Medically unstable for outpatient treatment according to the recommended thresholds of the American Academy of Pediatrics and the Society of Adolescent Medicine, defined as: vital sign instability (heart rate less than 45 beats per minute), clinically significant orthostatic blood pressure with changes usually greater than 35 points or findings of gastrointestinal bleeding, dizziness, or syncope, IBW \<75%, hypothermia (body temperature less than 36 degrees centigrade), clinically significant electrolyte abnormalities, or prolonged QTc on electrocardiogram * Expected Body Weight (EBW) \<75% or \> 88% * Unable to fluently speak and read English * Parent excluded * Suicidal * In the case of patients with current, or a history of sexual or physical abuse by family members, perpetrators of the abuse will be excluded from treatment.