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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
1,800
Real-time kcal counter synchronised with the food amount changes
Real-time PACE counter (as minutes needed to walk to burn off the calories) synchronised to the food amount changes
University of Liverpool
Liverpool, Merseyside, United Kingdom
Total self-served energy (kcal)
Energy content of the portion selected for each dish.
Time frame: 10 minutes (the time frame denotes time taken to perform the portion selection task and there is no follow up)
Kcal influence
Whether kcal content influences the quantity of self-served food
Time frame: 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.
Time frame: 3 minutes (the time frame denotes time taken to fill in the debriefing questionnaire and there is no follow up)
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