Effectiveness of a Self-Guided Intervention for Body Dysmorphia and Positive Psychological Outcomes Among Adolescents

## Detailed Description of the Clinical TrialThe primary objective of this clinical trial is to evaluate the effectiveness of asix‐week self‐guided psychological intervention designed to reduce the symptoms of BodyDysmorphic Disorder (BDD) among adolescents. The study also aims to investigate whetherparticipation in the intervention contributes to improvements in a range of positivepsychological outcomes that are associated with mental health, emotional resilience, andoverall psychological functioning.Body Dysmorphic Disorder is characterized by persistent preoccupation with perceiveddefects or flaws in one's physical appearance that are either unnoticeable or appearminor to others. These concerns often lead to significant emotional distress, repetitiveappearance‐related behaviors, social withdrawal, reduced quality of life, and impairedpsychological functioning. While therapist‐led interventions have demonstratedeffectiveness in treating BDD, self‐guided interventions may offer a more accessible,cost‐effective, and scalable approach, particularly for adolescents who face barriers toreceiving professional psychological treatment.This study seeks to determine whether a structured self‐guided intervention caneffectively reduce body dysmorphic symptoms while simultaneously promoting positivepsychological resources and well‐being. Rather than focusing solely on symptom reduction,the intervention adopts a positive psychology perspective by examining improvements inpsychological strengths and adaptive functioning.Specifically, the study will assess changes in the following psychological constructs: ‐ **Self‐compassion**, reflecting an individual's ability to respond to personalimperfections and emotional distress with kindness, understanding, and acceptancerather than self‐criticism. ‐ **Gratitude**, representing appreciation for positive experiences and recognition ofbeneficial aspects of life. ‐ **Mindfulness**, referring to present‐moment awareness accompanied by non‐judgmentalacceptance of thoughts, emotions, and bodily experiences. ‐ **Positive affect**, indicating the frequency and intensity of positive emotionalexperiences such as enthusiasm, happiness, confidence, and optimism. ‐ **Body satisfaction**, measuring the degree to which adolescents feel satisfied withtheir overall physical appearance and individual body features. ‐ **Body esteem**, assessing positive self‐evaluations regarding physical appearance,body image, and self‐worth related to one's body. ‐ **Psychological well‐being**, encompassing autonomy, environmental mastery, positiveinterpersonal relationships, personal growth, purpose in life, and self‐acceptance. ‐ **Psychological flexibility**, referring to the ability to remain open to internalexperiences while engaging in behaviors that are consistent with personal values andlong‐term goals. ‐ Research QuestionsThe study is designed to address the following research questions: 1. Is a six‐week self‐guided intervention effective in reducing the symptoms of BodyDysmorphic Disorder among adolescents? 2. Does participation in the self‐guided intervention lead to significant improvementsin positive psychological outcomes, including self‐compassion, gratitude,mindfulness, positive affect, body satisfaction, body esteem, psychologicalwell‐being, and psychological flexibility? 3. Are there significant differences between adolescents receiving the self‐guidedintervention and those in the control group following completion of theintervention? ‐ Study DesignThe research will employ a randomized controlled pretest‐posttest experimental design.Initially, adolescent participants will undergo screening using standardized measures toidentify the presence and severity of Body Dysmorphic Disorder symptoms. Individualsmeeting the predetermined eligibility criteria will be invited to participate in thestudy.Eligible participants will then be randomly assigned to one of two groups: ‐ **Experimental Group**, which will receive the six‐week self‐guided intervention. ‐ **Control Group**, which will not receive the intervention during the study period(or will receive treatment as usual/wait‐list control, depending on the studyprotocol).Before the intervention begins, participants in both groups will complete a comprehensivebattery of psychological assessments measuring Body Dysmorphic Disorder symptoms and allselected positive psychological variables. These baseline assessments will establishparticipants' initial levels of functioning and serve as the pretest measurements.Participants assigned to the experimental group will subsequently complete the structuredsix‐week self‐guided intervention. The intervention will include evidence‐basedpsychological exercises and activities intended to improve body image, encourage adaptivecognitive and emotional processing, cultivate self‐compassion and mindfulness, strengthengratitude, and promote overall psychological well‐being. Participants will complete theintervention independently while following standardized instructions provided by theresearchers.The control group will continue with their usual daily routines without receiving theintervention during the same six‐week period.At the conclusion of the intervention, participants in both the experimental and controlgroups will again complete the same set of psychological assessments. These posttestmeasurements will allow researchers to examine changes in Body Dysmorphic Disordersymptoms as well as changes across all positive psychological outcome measures.### Outcome EvaluationThe effectiveness of the intervention will be evaluated by comparing participants'pretest and posttest scores within each group and between the experimental and controlgroups. Statistical analyses will determine whether the self‐guided intervention producessignificant reductions in Body Dysmorphic Disorder symptoms and significant improvementsin self‐compassion, gratitude, mindfulness, positive affect, body satisfaction, bodyesteem, psychological well‐being, psychological flexibility, and overall psychologicalfunctioning.### Participant ProcedureParticipants enrolled in the study will complete the following sequence of activities: 1. Undergo screening for symptoms of Body Dysmorphic Disorder using standardizedassessment instruments. 2. Eligible participants who meet the inclusion criteria will provide informed consent(and parental consent where applicable). 3. Participants will be randomly allocated to either the experimental group or thecontrol group. 4. All participants will complete baseline (pretest) assessments of Body DysmorphicDisorder symptoms and all positive psychological outcome measures. 5. Participants in the experimental group will complete the six‐week self‐guidedintervention, while participants in the control group will not receive theintervention during this period. 6. Following completion of the intervention, both groups will complete the posttestassessments using the same psychological instruments administered at baseline. 7. Researchers will compare pretest and posttest scores to determine the effectivenessof the intervention in reducing Body Dysmorphic Disorder symptoms and enhancingpositive psychological outcomes.