Participants in the Experimental group start the MBA intervention immediately (Time 0; T0).

Participants in the waiting-list group start the MBA intervention at Time 1 (T1; 15 days after the Experimental group).

The MBA is an online psychological intervention designed to improve body image. The intervention lasts 15 days, and it comprises two types of activity (1st and 2nd week).

During the first week of the MBA intervention, participants sill read three blocks of psychoeducational material including information about: 1) body image; 2) positive body image and healthy lifestyles; and 3) body functionality.

During the second week participants produce 3 structured writing assessment pertaining to body functionality and why it is important. Each assignment focused on two areas of body functionality: 1) body's senses and physical capacities; 2) health and creative skills; 3) self-care/daily routine and communication with others. For each writing assignment, participants were asked to reflect, describe, and specify why these aspects of body functionality were personally important and meaningful to them.

Improvements in body appreciation assessed by means of a self-report questionnaire: Body Appreciation Scale-2 (BAS-2; Minimum value: 10; Maximum value: 50; higher scores represent higher body appreciation)

Reductions in body dysmorphic disorder symptoms assessed by means of a self-report questionnaire: Questionario sul Dismorfismo Corporeo (QDC; Minimum value: 40; Maximum value: 280; higher scores represent higher body dysmorphic disorder symptoms)

Improvements in functionality appreciation assessed by means of a self-report questionnaire: Functional Appreciation Scale (FAS; Minimum value: 7; Maximum value: 35; higher scores represent higher body functionality)

Reductions of the risk of developing eating disorders assessed by means of a self-report questionnaire: Eating Disorder Inventory-3 (EDI-3; Minimum value: 25; Maximum value: 150; higher scores represent higher risk)