Using the Norm Range to Predict the Effect of Food Portion Size Reductions on Compensation Over 5 Days

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

39 participants

Study Classification

INTERVENTIONAL

Study Start Date

2018-02-06

Study Completion Date

2018-12-10

Brief Summary

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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.

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Detailed Description

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Conditions

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Portion Size

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

PREVENTION

Blinding Strategy

SINGLE

Participants

Interventions

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portion size

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.

Intervention Type BEHAVIORAL

Eligibility Criteria

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Inclusion Criteria

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

Exclusion Criteria

* 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

Minimum Eligible Age

18 Years

Maximum Eligible Age

60 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes