Effectiveness of Information-based Versus Structural Interventions on Food Choices by Socioeconomic Position: a Randomized Controlled Trial in an Experimental Online Supermarket
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 1,000
- 试验地点
- 1
- 主要终点
- Mean ED of the food items purchased (kcal/100g)
研究概览
简要总结
This study will be a 2x2 randomised controlled trial with information-based intervention (no labelling / labelling) and structural intervention (default proportion / increased proportion of lower energy density food items) as between-subject factors and energy density (kcal/g) of food purchases during an online supermarket-shopping task as dependent variable. This study will use an online supermarket platform developed to mimic an online supermarket website and participants will be asked to complete a shopping task using a pre-determined shopping list of 10 items.
详细描述
See attached protocol documents.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •United Kingdom residents
- •Aged ≥ 18 years
- •Fluent in English
- •Have access to a computer and Internet
- •Responsible for a substantial proportion of household grocery shopping
排除标准
- •Unable to provide informed consent and to comply with the study requirements
- •Any dietary restriction (vegetarian, vegan, gluten-free, sugar-free, dairy or lactose free, food allergy, other)
研究组 & 干预措施
Default proportion & no labelling
No intervention:
Default proportion condition (33% lower energy density items - 67% higher energy density items). Lower energy density items will be defined as lower ED ≤ median of ED distribution within a food category.
No labelling.
Default proportion & labelling
When energy density of a food item ≤ median of energy density distribution within a food category, "healthier choice" badges will be added to the food item pictures on the online supermarket. Instructions will introduce the badges to the participants as "In the online supermarket, the green tick allows you to see which products (e.g. muesli) in each product category (e.g. cereals) are healthier choices with fewer calories per gram than most other products in the same category."
干预措施: Labelling (Behavioral)
Increased proportion & no labelling
The proportion of lower energy density items vs. higher energy density items will be reversed (67% lower - 33% higher) relative to the default proportion condition (33% lower - 67% higher). Lower energy density items will be defined as lower ED ≤ median of ED distribution within a food category.
干预措施: Increased proportion of lower energy density items (Behavioral)
Increased proportion & labelling
The proportion of lower energy density items vs. higher energy density items will be reversed (67% lower - 33% higher) relative to the default proportion condition (33% lower - 67% higher). Lower energy density items will be defined as lower ED ≤ median of ED distribution within a food category.
When energy density of a food item ≤ median of energy density distribution within a food category, "healthier choice" badges will be added to the food item pictures on the online supermarket. Instructions will introduce the badges to the participants as "In the online supermarket, the green tick allows you to see which products (e.g. muesli) in each product category (e.g. cereals) are healthier choices with fewer calories per gram than most other products in the same category."
干预措施: Increased proportion of lower energy density items (Behavioral)
Increased proportion & labelling
The proportion of lower energy density items vs. higher energy density items will be reversed (67% lower - 33% higher) relative to the default proportion condition (33% lower - 67% higher). Lower energy density items will be defined as lower ED ≤ median of ED distribution within a food category.
When energy density of a food item ≤ median of energy density distribution within a food category, "healthier choice" badges will be added to the food item pictures on the online supermarket. Instructions will introduce the badges to the participants as "In the online supermarket, the green tick allows you to see which products (e.g. muesli) in each product category (e.g. cereals) are healthier choices with fewer calories per gram than most other products in the same category."
干预措施: Labelling (Behavioral)
结局指标
主要结局
Mean ED of the food items purchased (kcal/100g)
时间窗: 20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up)
Calculated as the sum of the energy of the purchased items (kcal) divided by the sum of their weight (g) and multiplied by 100.
次要结局
- Energy from total sugar (% of total energy)(20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up))
- Total energy of the food items purchased (kcal)(20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up))
- Energy from saturated fatty acids (SFA) (% of total energy)(20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up))
- Salt content (g/100g)(20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up))
- Proportion of lower energy density food items in the basket of foods purchased(20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up))
- Cost (GPB)(20 minutes (the time frame denotes time taken to make the food shopping task online and there is no follow up))
研究者
Eric Robinson
Principal Investigator
University of Liverpool