Compensation for Smaller Portion Sizes and Portion Size Normality

Portion Size Clinical Trial

Official title:

Compensation for Smaller Portion Sizes and Portion Size Normality: Two Laboratory

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03731273
• Other study ID #: Portion size normality
• Status: Completed
• Phase: N/A
• Start date: October 4, 2016
• Est. completion date: July 25, 2017

Study information

• Verified date: November 2018
• Source: University of Liverpool
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Reducing food portion size is a potential strategy to reduce energy intake. However it is unclear at what point consumers compensate for reductions in portion size by increasing energy intake from other items. The investigators tested the hypothesis that reductions to food portion size will only result in significant compensatory eating when the reduced portion size is no longer visually perceived as 'normal'. In two within-subjects experiments, participants (Study 1: N = 45, M BMI = 26.9; Study 2: N = 37, M BMI = 26.9; 51% female) were served different sized portions of a lunchtime meal on three occasions: a 'large-normal', a 'small-normal', and a 'smaller than normal' portion. Both the reduction from 'large-normal' to 'small-normal' and from 'small-normal' to 'smaller than normal' portions represented the same change in food volume and energy content (84g, 77kcal Study 1; 98g, 117kcal Study 2). Participants were able to serve themselves additional helpings of the same food (Study 1), or dessert items (Study 2).

Recruitment information / eligibility

• Status: Completed
• Enrollment: 90
• Est. completion date: July 25, 2017
• Est. primary completion date: July 25, 2017
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• general liking and willingness to consume the test foods in each study

Exclusion Criteria:

• food allergies, intolerances or specific dietary requirements (including being vegetarian or vegan)

• a history of eating disorders;

Related Conditions & MeSH terms

• Portion Size

Intervention

Behavioral:
• portion size
Smaller than normal portion size - the intervention is the meal size perceived as 'smaller than normal' that participants are provided with during a lunchtime session in the laboratory. 'Small-normal' portion size - the intervention is the meal size perceived as 'small normal' that participants are provided with during a lunchtime session in the laboratory. 'Large normal' portion size - the intervention is the meal size perceived as 'large normal' that participants are provided with during a lunchtime session in the laboratory.

Locations

Country	Name	City	State
United Kingdom	Ashleigh Haynes	Liverpool	Merseyside

Sponsors (2)

Lead Sponsor	Collaborator
University of Liverpool	Medical Research Council

Country where clinical trial is conducted

United Kingdom, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Meal energy intake	Energy intake from the served portion	Immediate
Primary	'Compensatory' (additional) energy intake	Energy intake from additional food provided for consumption after the portion-manipulated meal	Immediate