Clinical Research Directory

Inclusion Criteria: All study subjects will have been diagnosed with AN (restricting type or binge eating/purging type) by the primary physician on the ED team, as per standard approach. Study participants will: * Be 12-17 years-old at time of recruitment * Have capacity to consent * Be assigned female sex at birth (may be gender diverse) * Be active patients in the pediatric ED program at MCH * Have a weight that is \<85% of the Treatment Goal Weight, as determined by the treating physician Exclusion Criteria: Potential study subjects will be excluded due to the following reasons: * Exposure to antibiotics within two weeks of study randomization * Initiation of new probiotics / oral nutritional supplements within two weeks of randomization * Active pregnancy * Active psychosis or suicidal ideation * Other comorbidities that may affect weight or the gut microbiome including celiac disease, inflammatory bowel disease (or other conditions as determined by the study team)