The investigators will recruit individuals with broadly-defined AN (n = 80) who are currently in or have recently participated in higher-level eating disorder treatment (e.g., residential, partial hospitalization/day treatment, intensive outpatient treatment). Interested participants will sign consent, complete eligibility assessments, and will be randomized to receive Positive Affect Treatment for Anorexia Nervosa (PAT-AN) or Psychoeducation and Behavioral Therapy (PBT) through teletherapy shortly following discharge from higher level of care. Participants can participate in most other forms of outpatient treatment while receiving the research intervention. Participants will engage in 24 weeks of PAT-AN or PBT starting in the first 3 months post-discharge. At each session, the investigators will complete brief measures assessing treatment acceptability, affect, and eating disorder symptoms. Participants will also complete an assessment battery of self-report, EMA, and neurocognitive measures evaluating primary outcomes (BMI; eating disorder symptoms), secondary outcomes (depression, anxiety, and suicidality), and presumed treatment mechanisms at baseline, end of treatment (EOT), and 3-month follow-up (FU). All assessments will be remotely delivered via HIPAA-compliant platforms.

Inclusion Criteria:

1. Age > or = 18 years old
2. Ability to read and speak in English
3. DSM-5 diagnosis of AN or atypical AN at admission to higher-level care
4. In higher-level care discharging to outpatient care or discharged to outpatient care within the past 3 months
5. Current BMI > or = 18.5 kg/m2 (or will be by time of discharge)
6. BMI increase of > or = 0.5 kg/m2 while in higher-level care
7. Ability to designate and sign a release of information for a primary physical or mental health provider for study duration
8. Willingness to participate in weekly assessments (e.g., weight monitoring) and audio or video recording of study therapy sessions for study duration
9. Access to a smartphone and/or computer permitting engagement in remote therapy and assessment.

Exclusion Criteria:

1. Medical instability for outpatient care;
2. Pregnancy
3. Lifetime DSM-5 primary psychotic or bipolar-I disorder
4. Current DSM-5 substance use disorder
5. Enrollment in outpatient therapy with highly overlapping content to PAT-AN

Final dataset will include information from self-report questionnaires, clinician-guided interviews, physical assessments, ecological momentary assessment, and neurocognitive tasks. Data will be de-identified and consistent with NDA regulations. Data will be shared via the National Database for Clinical Trials Related to Mental Illness (NDCT) in the NIMH Data Archive (NDA). Established by NIMH, and supported by other Institutes of NIH, the NDA is a secure informatics platform for scientific collaboration and data-sharing. All data will be collected from subjects who have broadly consented to share their data for research use or who have consented to share their data for research, with data use limitations. All de-identified data resulting from this project will be submitted to the NDA at the item level and subject level along with appropriate supporting documentation to enable efficient use of the data.

Descriptive/raw research data will be made available for access to other researchers within four (4) months after submission.