Effect of kcal and PACE Labelling on Self-served Portion Size

Study Overview
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Brief Summary
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Participants will take part in an online survey. They will be asked to choose the amount of food they would like to eat based on pictures of 18 dishes sequentially displayed on the screen. They will be randomly allocated to four different groups: kcal labelling, PACE labelling (Physical Activity Calorie Equivalent: minutes to walk to burn off the calories), kcal and PACE labelling combined, no labelling, in a between subject design. The main outcome variable is the total self-served energy for each dish (in kcal).

Detailed Description
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See attached protocol documents.

Official Title
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Socioeconomic Position and the Effect of kcal Labelling and PACE Labelling on Self-served Portion Size

Conditions
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Food Selection, Diet, Healthy

Intervention / Treatment
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* Behavioral: Kcal labelling
* Behavioral: PACE labelling


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: United Kingdom residents Age ≥ 18 Fluent in English Have access to a computer and Internet Exclusion Criteria: Have any dietary restriction (vegetarian, vegan, gluten-free, sugar-free, diary or lactose free, food allergy)

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Kcal labelling<br>Participants allocated to this group will see on the screen the amount of food increasing or decreasing based on how many times they tap on the corresponding keys and a real-time kcal counter synchronised with the food amount changes (i.e., increasing/decreasing). | Behavioral: Kcal labelling<br>* Real-time kcal counter synchronised with the food amount changes<br>|
| Experimental: PACE labelling<br>Participants allocated to this group will see on the screen the amount of food increasing or decreasing based on how many times they tap on the corresponding keys and a real-time PACE counter (as minutes needed to walk to burn off the calories) synchronised to the food amount changes (i.e., increasing/decreasing) with 4 min being equivalent to 20 kcal. | Behavioral: PACE labelling<br>* Real-time PACE counter (as minutes needed to walk to burn off the calories) synchronised to the food amount changes<br>|
| Experimental: Kcal and PACE labelling<br>Participants allocated to this group will see on the screen the amount of food increasing or decreasing based on how many times they tap on the corresponding keys and a real-time kcal and PACE counters synchronised to the food amount changes (i.e., increasing/decreasing). | Behavioral: Kcal labelling<br>* Real-time kcal counter synchronised with the food amount changes<br>Behavioral: PACE labelling<br>* Real-time PACE counter (as minutes needed to walk to burn off the calories) synchronised to the food amount changes<br>|
| No Intervention: No labelling<br>Participants allocated to this group will only see on the screen the amount of food increasing or decreasing based how many times they tap on the corresponding keys. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Total self-served energy (kcal) | Energy content of the portion selected for each dish. | 10 minutes (the time frame denotes time taken to perform the portion selection task and there is no follow up) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Kcal influence | Whether kcal content influences the quantity of self-served food | 3 minutes (the time frame denotes time taken to fill in the debriefing questionnaire and there is no follow up) | 
| PACE influence | Whether physical activity energy equivalent influences the quantity of self-served food. | 3 minutes (the time frame denotes time taken to fill in the debriefing questionnaire and there is no follow up) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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kcal labelling, PACE labelling, portion size, socio-economic position