Therapeutic Ketogenic Diet in Anorexia Nervosa

Weight-Recovered AN Inclusion Criteria: 1. Provision of signed and dated informed consent form 2. Stated willingness to comply with all study procedures and availability for the duration of the study 3. Persons, aged 18 to 45 years 4. History of anorexia nervosa according to DSM-5 criteria 5. Weight recovered at the time of study inclusion (body mass index \> 17.5 kg/m2) 6. Greater or equal to 2 standard deviations scores of eating disorder-relevant behaviors on the Eating Disorder Inventory-3 and Eating Disorder Examination Questionnaire 7. The following types of psychiatric medications are allowed: antidepressant, anxiolytic, atypical antipsychotic, mood stabilizers 8. English is primary spoken language Weight-Recovered AN Exclusion Criteria: 1. Pregnancy or lactation 2. Electrolyte, blood count, kidney function or liver function abnormalities 3. Psychosis 4. Neurocognitive disorders including dementias or traumatic brain injury that is symptomatic 5. Current alcohol use disorder (AUD) or substance use disorder (SUD) according to DSM-5 criteria 6. Uncontrolled hypertension 7. Hepatic impairment (Class-Pugh b or c) 8. Diabetes mellitus 9. Family history of porphyria 10. History of recent heart attack, vascular disease, or any other current acute medical conditions as determined by the principal investigator 11. Inability or unwillingness to adhere to the TKD diet for the duration of the study 12. Blind or illiterate individuals Underweight AN Sub-Study Inclusion Criteria: 1. Provision of signed and dated informed consent form 2. Stated willingness to comply with all study procedures and availability for the duration of the study 3. Persons, aged 18 to 45 years 4. Anorexia nervosa according to DSM-5 criteria 5. Current Body Mass Index (BMI) at the time of study inclusion of 16.0 to 17.49 6. An elevated EDE-Q global score of 2.09 or greater 7. The following types of psychiatric medications are allowed: antidepressant, anxiolytic, atypical antipsychotic, mood stabilizers 8. English is primary spoken language Underweight AN Sub-Study Exclusion Criteria: 1. Pregnancy or lactation 2. Electrolyte, blood count, kidney function or liver function abnormalities 3. Psychosis 4. Neurocognitive disorders including dementias or traumatic brain injury that is symptomatic 5. Current alcohol use disorder (AUD) or substance use disorder (SUD) according to DSM-5 criteria 6. Uncontrolled hypertension 7. Hepatic impairment (Class-Pugh b or c) 8. Diabetes mellitus 9. Family history of porphyria 10. History of recent heart attack, vascular disease, or any other current acute medical conditions as determined by the principal investigator 11. Inability or unwillingness to adhere to the TKD diet for the duration of the study 12. Blind or illiterate individuals Bulimia Nervosa Pilot Inclusion Criteria: 1. Provision of signed and dated informed consent form 2. Stated willingness to comply with all study procedures and availability for the duration of the study 3. Persons, aged 18 to 45 years 4. History of bulimia nervosa according to DSM-5 criteria 5. An elevated EDE-Q global score of 2.09 or greater 6. The following types of psychiatric medications are allowed: antidepressant, anxiolytic, atypical antipsychotic, mood stabilizers 7. English is primary spoken language Bulimia Nervosa Pilot Exclusion Criteria: 1. Pregnancy or lactation 2. Electrolyte, blood count, kidney function or liver function abnormalities 3. Psychosis 4. Neurocognitive disorders including dementias or traumatic brain injury that is symptomatic 5. Current alcohol use disorder (AUD) or substance use disorder (SUD) according to DSM-5 criteria 6. Uncontrolled hypertension 7. Hepatic impairment (Class-Pugh b or c) 8. Diabetes mellitus 9. Family history of porphyria 10. History of recent heart attack, vascular disease, or any other current acute medical conditions as determined by the principal investigator 11. Inability or unwillingness to adhere to the TKD diet for the duration of the study 12. Blind or illiterate individuals