NCT03811210

Brief 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. This could result in no overall benefit of reducing food portion sizes. The investigators tested the hypothesis that reductions to the portion size of components of a main meal will only result in significant compensatory eating when the reduced portion size is no longer visually perceived as 'normal'. In a crossover experiment, participants were served different sized portions during lunch and dinner over 5 days: a 'large-normal', a 'small-normal', and a 'smaller than normal' portion. Intake from all other meal components consumed in the laboratory were measured.

Trial Health

87
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
39

participants targeted

Target at P25-P50 for not_applicable

Timeline
Completed

Started Feb 2018

Shorter than P25 for not_applicable

Geographic Reach
1 country

1 active site

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

Study Start

First participant enrolled

February 6, 2018

Completed
10 months until next milestone

Primary Completion

Last participant's last visit for primary outcome

December 7, 2018

Completed
3 days until next milestone

Study Completion

Last participant's last visit for all outcomes

December 10, 2018

Completed
1 month until next milestone

First Submitted

Initial submission to the registry

January 17, 2019

Completed
5 days until next milestone

First Posted

Study publicly available on registry

January 22, 2019

Completed
Last Updated

January 24, 2019

Status Verified

January 1, 2019

Enrollment Period

10 months

First QC Date

January 17, 2019

Last Update Submit

January 22, 2019

Conditions

Portion Size

Outcome Measures

Primary Outcomes (3)

  • Acute compensatory energy intake

    Energy intake from main meal components that are not varied by portion size

    Immediate (within single meal occasion)

  • Total meal energy intake

    Energy intake from all main meal components (including those that are and are not varied by portion size)

    Immediate (within single meal occasion)

  • Total daily energy intake

    Energy intake from all foods consumed, including those provided in the laboratory and those self-reported

    Over 5 x full days

Secondary Outcomes (3)

  • Moderate-vigorous physical activity

    Over 5 x full days

  • Discretionary Leisure-time physical activity

    Over 5 x full days

  • Appetite

    Over 5 x full days (measured before and after each meal occasion)

Interventions

portion sizeBEHAVIORAL

Smaller than normal portion size - the intervention is the main meal component size perceived as 'smaller than normal' that participants are provided with during lunch and dinner in the laboratory. Small-normal portion size - the intervention is the main meal component size perceived as 'small-normal' that participants are provided with during lunch and dinner in the laboratory. Large-normal portion size - the intervention is the main meal component size perceived as 'large-normal' that participants are provided with during lunch and dinner in the laboratory.

Eligibility Criteria

Age18 Years - 60 Years
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64)

You may qualify if:

  • willing to consume the test foods
  • BMI between 22.5 - 32.5

You may not qualify if:

  • food allergies, intolerances or specific dietary requirements (including being vegetarian or vegan)
  • history of eating disorders
  • taking medication which affected appetite
  • participated in a portion size studies in the past 12 months, or in dieting or weight loss trials in the past 4 weeks

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

Ashleigh Haynes

Liverpool, Merseyside, L3 6AA, United Kingdom

Location

Related Publications (1)

  • Haynes A, Hardman CA, Halford JCG, Jebb SA, Mead BR, Robinson E. Reductions to main meal portion sizes reduce daily energy intake regardless of perceived normality of portion size: a 5 day cross-over laboratory experiment. Int J Behav Nutr Phys Act. 2020 Feb 12;17(1):21. doi: 10.1186/s12966-020-0920-4.

    PMID: 32050979DERIVED

MeSH Terms

Interventions

Portion Size

Intervention Hierarchy (Ancestors)

DietNutritional Physiological PhenomenaDiet, Food, and NutritionPhysiological Phenomena

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
SINGLE
Who Masked
PARTICIPANT
Purpose
PREVENTION
Intervention Model
CROSSOVER
Sponsor Type
OTHER
Responsible Party
PRINCIPAL INVESTIGATOR
PI Title
Reader in Psychological Sciences

Study Record Dates

First Submitted

January 17, 2019

First Posted

January 22, 2019

Study Start

February 6, 2018

Primary Completion

December 7, 2018

Study Completion

December 10, 2018

Last Updated

January 24, 2019

Record last verified: 2019-01

Data Sharing

IPD Sharing
Will share

IPD for primary outcome measures, demographic variables, and data reported in resulting publication will be made freely available on Open Science Framework

Shared Documents
STUDY PROTOCOL, SAP
Time Frame
Study protocol and statistical analysis plan, along with IPD data will be made publicly available on Open Science Framework when results are published
Access Criteria
Data will be freely accessible.

Locations

GB(1)