This study is a two-arm pilot randomized controlled trial designed to evaluate the feasibility and preliminary effects of an Acceptance and Commitment Therapy (ACT) theory-based mobile application integrated with a smartphone pedometer plus health education on weight self-stigma and lifestyle behaviors among overweight or obese adults. A total of 60 participants will be recruited and randomized 1:1 to the intervention (ACT-based app + pedometer + health education) or control condition. Outcomes will be assessed at baseline (T0), immediately after intervention (T1), and at 1 month after intervention (T2) and 3 months after intervention (T3) following intervention initiation. The primary outcomes are body weight (weight loss) and weight self-stigma measured; secondary outcomes include eating behavior, physical activity level, and quality of life. Analyses will include per-protocol evaluation using linear mixed-effects models to test group, time, and group-by-time effects on primary and secondary outcomes, with intention-to-treat analyses conducted as sensitivity analyses using multiple imputation for missing weight and weight self-stigma data. Findings will inform the design of a future definitive trial and contribute evidence on eHealth approaches to reducing weight-related stigma and supporting healthier lifestyles.
Age range
18 Years – 55 Years
Sex
ALL
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The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Body weight
Timeframe: T0: baseline/randomization; T1: immediately post-intervention; T2: 1 month post-intervention; T3: 3 months post-intervention
Body Mass Index
Timeframe: T0: baseline/randomization; T1: immediately post-intervention; T2: 1 month post-intervention; T3: 3 months post-intervention.
Waist circumference
Timeframe: T0: baseline/randomization; T1: immediately post-intervention; T2: 1 month post-intervention; T3: 3 months post-intervention.
Body composition - Body fat percentage
Timeframe: T0: baseline/randomization; T1: immediately post-intervention; T2: 1 month post-intervention; T3: 3 months post-intervention.
Body composition - Body water percentage
Timeframe: T0: baseline/randomization; T1: immediately post-intervention; T2: 1 month post-intervention; T3: 3 months post-intervention.
Body composition - Muscle mass
Timeframe: T0: baseline/randomization; T1: immediately post-intervention; T2: 1 month post-intervention; T3: 3 months post-intervention.
Body composition - Visceral fat
Timeframe: T0: baseline/randomization; T1: immediately post-intervention; T2: 1 month post-intervention; T3: 3 months post-intervention.
Weight Self-Stigma
Timeframe: T0: baseline/randomization; T1: immediately post-intervention; T2: 1 month post-intervention; T3: 3 months post-intervention.