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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).
See attached protocol documents.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Kcal labelling | Experimental | 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). |
|
| PACE labelling | Experimental | 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. |
|
| Kcal and PACE labelling | Experimental | 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). |
|
| No labelling | No Intervention | 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. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Kcal labelling | Behavioral | Real-time kcal counter synchronised with the food amount changes |
|
| 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) |
| 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 |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Liverpool | Liverpool | Merseyside | L69 7ZA | United Kingdom |
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| ID | Type | URL | Comment |
|---|---|---|---|
| Study Protocol | View IPD |
Shared on the Open Science Framework
On publication, indefinitely
Open website
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP_ICF | Yes | Yes | Yes | Study Protocol, Statistical Analysis Plan, and Informed Consent Form | Apr 7, 2020 | Apr 7, 2020 | Prot_SAP_ICF_000.pdf |
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| ID | Term |
|---|---|
| D005518 | Food Preferences |
| ID | Term |
|---|---|
| D005247 | Feeding Behavior |
| D001519 | Behavior |
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| PACE labelling | Behavioral | Real-time PACE counter (as minutes needed to walk to burn off the calories) synchronised to the food amount changes |
|
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) |
| Statistical Analysis Plan | View IPD |
| Informed Consent Form | View IPD |
| Individual Participant Data Set | View IPD | When results will be published |