NCT06119295

Investigating the Effects of Altering Portion Size Reduction Awareness on Compensatory Eating Behaviour

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 108 (actual)
• Sponsor: University of Liverpool · Academic / Other
• Sex: All
• Age: 18 Years – 60 Years
• Healthy volunteers: Accepted

Summary

The present study aims to investigate whether energy intake is reduced when participants consume a reduced portion size (15% compared to the 'control' portion), and also to see whether awareness of this reduction affects energy intake.

Detailed description

In the present study, all participants will participate in two sessions - the baseline session and the experimental session. In the baseline session, participants will be given ad libitum access to a lunch meal (followed by ad libitum access to dessert), and ad libitum access to a dinner meal (followed by ad libitum access to dessert). Then, after a washout period of between 1-6 weeks, participants will return to complete the experimental session, where they will be randomised to one of three conditions: Condition 1 (control condition): The same as the baseline condition except that the lunch will be of a fixed portion which participants must consume all of - this portion size will be the same amount of food as was consumed in the ad libitum lunch meal in the baseline session (participants will be told that the amount of food served is the same as the amount they consumed in the baseline session). Condition 2 (reduced aware condition): The same as the baseline condition except that the lunch will be of a fixed portion which participants must consume all of - this portion size will be 15% less than the amount of food consumed in the ad libitum lunch meal in the baseline session (participants will be told that the amount of food served has been reduced from the amount they consumed in the baseline session). Condition 3 (reduced unaware condition): The same as the baseline condition except that the lunch will be of a fixed portion which participants must consume all of - this portion size will be 15% less than the amount of food consumed in the ad libitum lunch meal in the baseline session (participants will be told that the amount of food served is the same as the amount they consumed in the baseline session).

Conditions

• Eating Behavior
• Obesity

Interventions

Type	Name	Description
BEHAVIORAL	Portion size manipulation	The intervention will be administered via changing portion sizes of foods served to participants. Depending on the condition participants are in, they will be served either a portion size which consists of the amount of food they consumed in the first test session, or a reduced portion size. Within these two reduced portion size conditions, one group of participants will be made aware that their portion size has been reduced, the other will not and instead will be told that this portion size is the same as the amount of food they consumed in the previous session.

Timeline

• Start date: 2023-11-01
• Primary completion: 2024-05-16
• Completion: 2024-05-16
• First posted: 2023-11-07
• Last updated: 2024-12-18

Locations

1 site across 1 country: United Kingdom