Provision of Small vs. Large Portion Sizes and Later Food Intake

Not Applicable

Completed

• Conditions: Eating Behavior
• Interventions: Behavioral: Large portion size provision; Behavioral: Small portion size provision

• Registration Number: NCT03241576
• Lead Sponsor: University of Liverpool

Brief Summary

In 3 laboratory experiments the effect that receiving a small vs. large portion size of food has on later intake of that food was examined

Detailed Description

Historical increases in the size of commercially available food products have been linked to the emergence of a worldwide obesity crisis. Although the acute effect portion size has on food intake is well established, the effect that exposure to smaller portion sizes has on future portion size selection is yet to be examined.We tested whether reducing a food portion size may 'renormalize' perceptions of what constitutes a normal amount of food to eat and result in people selecting and consuming smaller portions of that food in future. Across three experiments participants were served a large or smaller portion of food. In experiments 1-2, twenty four hours later participants freely selected and consumed a portion of that food. In experiment 3, one week later participants reported on their preferred portion size of that food.

Study Timeline

• Study Start: 2015-05-01
• Primary Completion: 2017-04-01
• Study Completion: 2017-04-01
• Status Verified: 2017-08
• Study First Submitted: 2017-08-02
• Study First Submitted QC: 2017-08-04
• Last Update Submitted: 2017-08-04
• Study First Posted: 2017-08-07
• Last Update Posted: 2017-08-07

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 307

Inclusion Criteria

• 18 years or older

Exclusion Criteria

• History of food allergy, eating disorder or currently dieting to lose weight

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Large portion size provision	Large portion size provision	Participants in this arm are served a large serving of a lunchtime food to eat (session 1).
Small portion size provision	Small portion size provision	Participants in this arm are served a small serving of a lunchtime food to eat (session 1).

Primary Outcome Measures

Name	Time	Method
Later food intake (24 hour)	Measured 24 hours after random allocation (experiments 1 and 2)	Amount of the lunchtime food later chosen and consumed
Later food intake (7 days)	Measured 7 days after allocation (experiment 3)	Amount of the lunchtime food later chosen and consumed