Investigating effects of dietary weight loss intervention using the behavioral model of acceptance and commitment therapy on eating behaviors in overweight and obese adults : A Cluster Randomized Controlled Trial study

Investigating effects of dietary weight loss intervention using the behavioral model of acceptance and commitment therapy on eating behaviors in overweight and obese adults: A Cluster Randomized Controlled Trial study

Status

Recruiting

Phases

Phase 3

Study type

Interventional

Source

IRCT

Registry ID

IRCT20170812035642N7

Enrollment

130

Registered

2025-09-16

Start date

2025-09-23

Completion date

Unknown

Last updated

2025-10-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Condition 1: eating behaviors. Condition 2: Overweight and Obesity. Overweight and obesity

Interventions

Intervention 1: Intervention group: Intervention group: Individuals in this group receive three interventions: Weight Loss Diet, Acceptance and Commitment Behavioral Therapy intervention, and Physical

Session 1: Getting to know and building relationships with group members, psycho-education, understanding cognitive fusion, mindfulness, and emotion from an ACT perspective, and distributing a questio

Session 2: Discussing experiences and evaluating them, creating creative frustration, asking individuals to talk about their anxieties, and reviewing the effectiveness of the next week's practice

Session 3: Introducing the desire to experience emotion as an alternative to control, the degree of apparent success in controlling emotions, programming internal events, and practicing numbers

Session 4: Review of previous session experiences, behavioral task and commitment, introduction of fault-finding, application of cognitive fault-finding techniques, rest and reception, intervention in

Session 5: Review of observer's task and behavioral commitment, showing the separation between self, inner experiences and behavior, observing self as a context, weakening self-concept and self-expres

Session 6: Performance assessment, application of mindfulness methods, conflict between experience and min

Eligibility

Sex/Gender

All

Age

20 Years to 59 Years

Inclusion criteria

Inclusion criteria: Adults Aged 20-59 Years Overweight or obese people (Body Mass Index 25-40) Both genders Living in Tehran Willingness to participate in the Study

Exclusion criteria

Exclusion criteria: Being pregnant or breastfeeding, or planning to become pregnant in the next 12 months Following a specific diet Current participation in a weight loss program or a behavioral therapy program Recent weight loss Serious medical conditions (such as diabetes, cancer, Alzheimer's, Parkinson's, liver and kidney diseases, history of stroke and heart attack, rheumatoid arthritis, and other chronic diseases as self-reported) Serious mental disorders (such as bipolar disorder, schizophrenia) Using medication for overweight and obesity Using medication for mental disorders History of bariatric surgery Smoking Current substance abuse or dependency Inability to perform physical activities

Design outcomes

Primary

Measure	Time frame
Eating behaviors. Timepoint: Beginning of the Intervention (Before the Start of the Intervention) and End of the Intervention (After the End of the 12-Weeks Intervention). Method of measurement: TFEQ-R18 (Three-Factor Eating Questionnaire),Treatment Self-Regulation Questionnaire(TSRQ) , Dietary habits Questionnaire.	—

Secondary

Measure	Time frame
Dietary restraint. Timepoint: Beginning of the Intervention (Before the Start of the Intervention) and End of the Intervention (After the End of the 12-Weeks Intervention). Method of measurement: Three-Factor Eating Questionnaire – Revised 18-item(TFEQ-R18).;Self regulation. Timepoint: Beginning of the Intervention (Before the Start of the Intervention) and End of the Intervention (After the End of the 12-Weeks Intervention). Method of measurement: Treatment Self-Regulation Questionnaire.;Dietary habits. Timepoint: Beginning of the Intervention (Before the Start of the Intervention) and End of the Intervention (After the End of the 12-Weeks Intervention). Method of measurement: Dietary habits Questionnaire.	—

Measure

Time frame

Dietary restraint. Timepoint: Beginning of the Intervention (Before the Start of the Intervention) and End of the Intervention (After the End of the 12-Weeks Intervention). Method of measurement: Three-Factor Eating Questionnaire – Revised 18-item(TFEQ-R18).;Self regulation. Timepoint: Beginning of the Intervention (Before the Start of the Intervention) and End of the Intervention (After the End of the 12-Weeks Intervention). Method of measurement: Treatment Self-Regulation Questionnaire.;Dietary habits. Timepoint: Beginning of the Intervention (Before the Start of the Intervention) and End of the Intervention (After the End of the 12-Weeks Intervention). Method of measurement: Dietary habits Questionnaire.

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Countries

Iran (Islamic Republic of)

Contacts

Public ContactSakineh Shabbidar

Tehran University of Medical Sciences

s_shabbidar@tums.ac.ir+98 21 8895 5742

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Feb 4, 2026