Effectiveness of acceptance and commitment therapy on weight, eating behaviours and psychological outcomes: a systematic review and meta-analysis

Han Shi Jocelyn Chew; Samuel Chng; Nagadarshini Nicole Rajasegaran; Khun Hean Choy; Yuen Yu Chong

doi:10.1007/s40519-023-01535-6

Effectiveness of acceptance and commitment therapy on weight, eating behaviours and psychological outcomes: a systematic review and meta-analysis

Eat Weight Disord. 2023 Feb 10;28(1):6. doi: 10.1007/s40519-023-01535-6.

Authors

Han Shi Jocelyn Chew¹, Samuel Chng², Nagadarshini Nicole Rajasegaran³, Khun Hean Choy³, Yuen Yu Chong⁴

Affiliations

¹ Alice Lee Centre for Nursing Studies, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore. jocelyn.chew.hs@nus.edu.sg.
² Lee Kuan Yew Centre for Innovative Cities, Singapore University of Technology and Design, Singapore, Singapore.
³ Alice Lee Centre for Nursing Studies, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
⁴ The Nethersole School of Nursing, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China.

Abstract

Purpose: To examine the effectiveness of ACT on weight (body mass index and body mass), eating behaviours (binge eating, emotional eating, external eating and restraint eating), and psychological outcomes (quality of life [QoL], depression, psychological flexibility, and weight stigma) among adults with overweight and obesity.

Methods: Seven electronic databases (CINAHL, EMBASE, PubMed, PsycInfo Scopus, The Cochrane Library, and Web of Science) were searched from inception through 17 June 2022. 13 studies and 48 unique effect sizes were analyzed using random-effects models. Pooled effect estimates were calculated using weighted mean differences (WMD) and standardized mean differences expressed in Hedges' g (g). Heterogeneity was assessed using Q-statistics and interpreted using I².

Results: ACT was found to be effective in improving weight loss in terms of BMI (k = 6, WMD = - .50, 95% CI = - .90; - .11, t = - 3.25, p = .20, I² = .0%), psychological flexibility and weight-related stigma. However, non-significant changes were found for body mass (k = 4, WMD = - 0.33 95% CI = - 1.53; 0.87, t = - .88, p = .44, I² = .0%), binge eating (k = 4, g = - .34, 95% CI = - 1.31; 0.62, t = - 1.13, p = .34, I² = 71.1%), emotional eating (k = 6, g = - .20, 95% CI = - 0.54; 0.15, t = - 1.47, p = .20, I² = 45.0%), external eating (k = 5, g = - .40, 95% CI = 0.96; 0.16, t = - 1.99, p = .12, I² = 81.8%), restraint eating (k = 3, g = .22 95% CI = - 0.57; 1.01, t = 1.19, p = .36, I² = 69.1%), QoL (k = 3, g = .01, 95% CI = - 1.51; 1.52, t = .02, p = .99, I² = 90.2%) and depression (k = 3, g = - .55, 95% CI = - 1.78; 0.67, t = - 1.94, p = .19, I² = 79.9%).

Conclusion: ACT could be effective in improving weight loss but more studies are needed to ascertain its effectiveness and the underlying mechanism by which the various components influence weight-related outcomes.

Level of evidence: Evidence obtained from a systematic review and meta-analysis of existing empirical studies.

Keywords: ACT; Acceptance commitment therapy; Behaviour change; Eating; Obesity; Psychological flexibility; Weight.

Publication types

Meta-Analysis
Systematic Review
Review

MeSH terms

Acceptance and Commitment Therapy*
Adult
Bulimia* / psychology
Feeding Behavior
Humans
Obesity / psychology
Obesity / therapy
Quality of Life
Weight Loss