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

Obesity Clinical Trial

Official title:

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

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT06119295
• Other study ID #: Portion size reduction study
• Status: Recruiting
• Phase: N/A
• Start date: November 1, 2023
• Est. completion date: April 30, 2024

Study information

• Verified date: November 2023
• Source: University of Liverpool
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial 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.

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).

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 108
• Est. completion date: April 30, 2024
• Est. primary completion date: April 30, 2024
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 60 Years

Eligibility

Inclusion Criteria:

• United Kingdom (UK) residents able to visit laboratory on campus in Liverpool, aged = 18

• Body Mass Index (BMI) between 18.5 and 32.5 kg/m2

• Proficiency in English language

• Self-report willingness to eat each of the test foods

Exclusion Criteria:

• Current medication use which affects appetite

• Pregnant

• Currently or previously diagnosed with an eating disorder

• Currently on a diet

• Have any food allergies or intolerances

• Are vegan

Related Conditions & MeSH terms

• Eating Behavior
• Obesity

Intervention

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.

Locations

Country	Name	City	State
United Kingdom	University of Liverpool	Liverpool

Sponsors (1)

Lead Sponsor	Collaborator
University of Liverpool

Country where clinical trial is conducted

United Kingdom, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Immediate energy intake post-fixed lunch meal	Amount of energy consumed from the lunch dessert	Within 30 minutes after intervention administered
Primary	Total delayed post-fixed lunch meal energy intake	Amount of energy consumed from the post-lunch snack box intake, dinner meal, dinner dessert, post-dinner snack box intake, additional energy intake	Within 10 hours after intervention administered
Primary	Total post-fixed lunch meal energy intake	Amount of energy consumed from the lunch dessert, post-lunch snack box intake, dinner meal, dinner dessert, post-dinner snack box intake, additional energy intake	Within 10 hours after intervention administered
Secondary	Post-lunch snack box intake	Amount of energy consumed from snack box consumed between lunch and dinner	Within 4 hours after intervention administered
Secondary	Total intake of the ad libitum dinner meal	Amount of energy consumed from the dinner meal	Within 4-5 hours after intervention administered