The intervention will be delivered through a smartphone app. The app provides users with ED symptom self-monitoring, psycho-education and relapse prevention in an evidence-based CBT-E.

EDE-Q subscales Higher scores indicate higher eating disorder symptomology.

EDE-Q subscales Higher scores indicate higher eating disorder symptomology.

The Eating Attitude Test (EAT) is a 40-item, 6-point, self-report scale that measures dieting behaviors, food preoccupation, anorexia, bulimia, and concerns about being overweight. The total score (between 0 and 78) provides an overall risk score, where higher scores indicating greater risk of an eating disorder.

The Yale Food Addiction Scale is a 35-item self-report inventory to identify people most likely to have an addiction to high-fat and/or high-sugar foods. The scale uses a combination of Likert and dichotomous scoring options. The YFAS provides two scoring options, a "symptom" count version that indicates the number of dependence symptoms experienced in the past 12 months and a "diagnostic" threshold that is met when three or more "symptoms" are present during the past 12 months and clinically significant impairment or distress is endorsed(Gearhardt et al., 2012).

The Yale Food Addiction Scale for Children(YFAS-C) is a 25-item, 5-point self-report scale with higher scores indicating more food addiction symptoms in children. Items 1 to 18 are rated on a 5-point Likert scale and Items 19 to 25 are rated on a dichotomous (0 = no; 1 = yes) scale.

The Difficulties in Emotion Regulation Scale(DERS) is the 36 items self-report scale to asks respondents how they relate to their emotions. Scores are presented as a total score as well as a score for each of the 6 subscales. Higher scores mean greater problems with emotion regulation.

The Beck Depression Inventory (BDI) is a 21-item self-reporting questionnaire for assessing the severity of depression. The total score range from 0 to 63 and 0-9 indicates minimal depression, 10-18: indicates mild depression, 19-29: indicates moderate depression and 30-63: indicates severe depression.

The State-Trait Anxiety Inventory (STAI) is a commonly used measure of trait and state anxiety. All items are rated on a 4-point scale. Higher scores indicate greater anxiety

The Clinical Impairment Assessment questionnaire (CIA) is a 16-items self-report measure to assess psychosocial impairment resulting from eating disorder features. Possible scores range between 0 - 48, with higher scores indicating more impairment and lower scores indicating less impairment.

The Rosenberg Self-Esteem Scale(RSES) is a A 10-item scale that measures global self-worth by measuring both positive and negative feelings about the self. The total score is from 0 to 30, with higher scores representing higher self-esteem.

Drive for thinness (DT), a subscale of the Eating Disorder Inventory (EDI), is a self-report measure of disordered eating attitudes about body image, weight, and shape. The total score is from 0 to 21. Higher scores mean an excessive concern with dieting, preoccupation with weight, and fear of weight gain

The Eating Disorder Diagnostic Scale (EDDS) is a 22-item self-report questionnaire designed to measure eating disorders symptomatology

The heart rate variabilities the physiological recordings of the variation in the time interval between consecutive heartbeats in milliseconds. This measures only those who want it

Functional near-infrared spectroscopy (fNIRS) is a tool to measure functional brain activities using the changes of optical absorption in the brain through the intact skull. This tool measures only those who want it, and the target number of participants is 40.