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Effects of Information Length and Implementation Intentions on Adherence to Weight Management Strategies:
Khaleda Ahmadyar1, Joanna Szypula1, Angeliki Bogosian1
1School of Health and Medical Sciences, City St George's, University of London, Northampton Square, London, EC1V 0HB, United Kingdom, 44 020 7040 5060.
JMIR Mhealth and Uhealth
|August 8, 2025
Summary
Shorter explanations and implementation intentions may improve weight management strategy adherence, especially for individuals with weaker planning skills. Further research is needed to confirm these findings for better health behavior engagement.
Area of Science:
- Behavioral Science
- Health Psychology
- Digital Health
Background:
- Weight management interventions can be less effective if lengthy explanations reduce engagement.
- Implementation intentions are a proven method to boost adherence in health behaviors.
Purpose of the Study:
- To examine how explanation length and implementation intentions affect adherence to weight management strategies.
- To investigate the role of need for cognition and planning skills as moderators.
Main Methods:
- 200 participants with BMI > 25 used a smartphone app for weight management.
- Intervention groups received brief or detailed strategy explanations and either implementation intentions or tips.
- Daily adherence prompts were sent over two weeks; moderators were measured at baseline.
Main Results:
- Brief explanations showed slightly higher adherence (74%) than detailed ones (69%), but not significantly.
- Adherence did not differ between implementation intentions and tips overall.
- Poorer planning skills were linked to higher adherence with implementation intentions compared to tips.
Conclusions:
- Shorter explanations and implementation intentions may enhance adherence to weight management strategies, particularly for individuals with lower planning abilities.
- Further research is recommended to validate these findings and optimize digital health interventions.
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