Can a brain zapping helmet help treat anorexia?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age 18-65 years * Self-reported enrollment in outpatient-level treatment at local eating disorder treatment centers in the Twin Cities region, and meeting DSM-5 criteria for AN (mild severity, based on BMI greater than or equal to 17.0 kg/m2) or atypical AN diagnosis (based on MINI and EDE assessments). * Participant must be capable of giving informed consent, based on UCSD Brief Assessment of Capacity to Consent (UBACC) risk assessment. * Sufficient spoken English so as to be able to comprehend testing procedures. Normative ranges on a C-RENAL blood panel (panel and ranges specified here: https://labguide.fairview.org/showtest.asp?testid=3321) Exclusion Criteria: * Substance abuse in the participant * Neurological condition or other developmental disorder * Serious psychiatric disorder known to affect brain functioning and cognitive performance (e.g., schizophrenia, schizoaffective disorder) * Medical instability, which will be evident based on required outpatient treatment status. In standard eating disorders treatment, individuals who are not medically stable are referred to higher levels of care (e.g., residential treatment, inpatient). Therefore, if a participant is enrolled in higher level care for their eating disorder diagnosis, this indicates medical instability and they will be excluded from enrollment in this study. * tDCS contraindication (e.g., history of craniotomy, history of metallic cranial plates, screws, implanted devices). * Acute suicidality (suicidalideation with a plan or intent), assessed via MINI suicidality module and Beck Depression Inventory suicide item * Acute homicidality (homicidal ideation with a plan or intent), assessed via MINI * Moderate, severe or extreme AN diagnostic severity, based on BMI as per DSM-5 criteria (e.g., BMI \<17.0 kg/m2)