Promoting Healthier Food Purchases By Leveraging the Online-Grocery Environment

NCT ID: NCT02489396

Last Updated: 2018-05-03

Basic Information

• Recruitment Status: UNKNOWN
• Total Enrollment: 400 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2015-08-31
• Study Completion Date: 2019-08-31

Brief Summary

Rationale: Online-grocery shopping is predicted to be one of the "hottest" food trends of 2014, as national retailers such as Amazon, as well as start-up companies, venture into the e- commerce grocery sector. Importantly, the online-grocery environment could be uniquely manipulated to promote healthier food purchasing and help with weight control. Since consumers tend to choose items listed first on menus and buffet lines, the order of food products displayed on the grocer's website may impact purchasing. Furthermore, it's possible that in an online-grocery environment, nutrition information could be made more salient to consumers. For example, previous research has demonstrated that label color influences perceptions of the healthfulness of foods. The FDA also recently proposed a redesign of foods' nutrition facts panels, which would highlight calorie content in a larger font. Although implementing this label change on all food labels could take years, e-commerce sites could change the format of the nutritional information they display much more quickly.

Objectives: The proposed study intends to nudge consumers to make healthier grocery purchases through three distinct interventions: 1.) Manipulating the order of food items within grocery categories; 2.) Displaying product nutrition information in red or green; and 3.) Presenting calorie information in a larger font size. We propose to examine these concepts in adult consumers using a grocery e-commerce platform servicing socioeconomically and racially diverse communities in the northeastern U.S.

Conditions

Obesity

Study Design

• Observational Model Type: OTHER
• Study Time Perspective: PROSPECTIVE

Study Groups

Grocery Customers

All customers who shop on the Rosie site during the intervention period.

Nutrition facts automatically or not automatically displayed

Intervention Type: BEHAVIORAL

For two months nutrition information on the Rosie site will be displayed in a "tab" that consumers can click on to display the nutrition facts panels of products. Investigators will use NuVal scores to determine the fifteen "healthiest," and fifteen "least healthy" items in six grocery categories; chips, cookies, cereal \& breakfast, yogurt, ice cream, and frozen pizza. We will then compare the number of clicks on nutrition information for healthier versus less healthy items to determine if there's a possibility of willful ignorance coming into play when choosing to purchase less healthy items.

Nutrition facts in color

Intervention Type: BEHAVIORAL

For two months the font on products' nutrition facts labels will be displayed in red or green. For this proof-of-concept intervention, the color of a label's display will be determined randomly, in order to gather a clearer picture of whether label color could be leveraged to influence product choice. Items in each grocery category will be randomly assigned to receive green or red labels during the intervention period, so 50% of products in each category have red nutrition facts labels, and 50% have green nutrition facts labels. We will then compare proportions of green to red items purchased during the intervention period with the proportion of those same items purchased during the baseline period, when all labels were in black font.

Nutrition Facts Label in Larger Font

Intervention Type: BEHAVIORAL

For two months the serving size and calorie lines on the nutrition facts labels will be displayed in a larger font for every item on the Rosie site. Average calories in customer purchases will be quantified using purchase data, and the average calories for online-grocery orders during baseline and intervention periods will be compared.

Healthier Items First

Intervention Type: BEHAVIORAL

For two months, instead of the product popularity default-display option in the online store, thirty healthier items will be displayed on the first page in each grocery category. All grocery categories where there is scoring variation between healthy and less-healthy options (i.e. cereal, chips, bakery, sauces, etc.) will be included in the intervention. The thirty-targeted healthy items will be identified using NuVal scores. NuVal scores will not actually be displayed as part of the shopping site, and will be used exclusively as a guide to systematically determine targeted items in each food category. The proportion of targeted healthy items purchased in each category versus non-targeted items purchased during the intervention will be compared to the proportion of targeted vs. non-targeted items purchased during the baseline period.

Interventions

Nutrition facts automatically or not automatically displayed

For two months nutrition information on the Rosie site will be displayed in a "tab" that consumers can click on to display the nutrition facts panels of products. Investigators will use NuVal scores to determine the fifteen "healthiest," and fifteen "least healthy" items in six grocery categories; chips, cookies, cereal \& breakfast, yogurt, ice cream, and frozen pizza. We will then compare the number of clicks on nutrition information for healthier versus less healthy items to determine if there's a possibility of willful ignorance coming into play when choosing to purchase less healthy items.

Intervention Type: BEHAVIORAL

Nutrition facts in color

For two months the font on products' nutrition facts labels will be displayed in red or green. For this proof-of-concept intervention, the color of a label's display will be determined randomly, in order to gather a clearer picture of whether label color could be leveraged to influence product choice. Items in each grocery category will be randomly assigned to receive green or red labels during the intervention period, so 50% of products in each category have red nutrition facts labels, and 50% have green nutrition facts labels. We will then compare proportions of green to red items purchased during the intervention period with the proportion of those same items purchased during the baseline period, when all labels were in black font.

Intervention Type: BEHAVIORAL

Nutrition Facts Label in Larger Font

For two months the serving size and calorie lines on the nutrition facts labels will be displayed in a larger font for every item on the Rosie site. Average calories in customer purchases will be quantified using purchase data, and the average calories for online-grocery orders during baseline and intervention periods will be compared.

Intervention Type: BEHAVIORAL

Healthier Items First

For two months, instead of the product popularity default-display option in the online store, thirty healthier items will be displayed on the first page in each grocery category. All grocery categories where there is scoring variation between healthy and less-healthy options (i.e. cereal, chips, bakery, sauces, etc.) will be included in the intervention. The thirty-targeted healthy items will be identified using NuVal scores. NuVal scores will not actually be displayed as part of the shopping site, and will be used exclusively as a guide to systematically determine targeted items in each food category. The proportion of targeted healthy items purchased in each category versus non-targeted items purchased during the intervention will be compared to the proportion of targeted vs. non-targeted items purchased during the baseline period.

Intervention Type: BEHAVIORAL

Eligibility Criteria

Inclusion Criteria

• Shopping on a Rosie grocery site

• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

University of Vermont

OTHER

Sponsor Role: lead

Responsible Party

Lizzy Pope

Assistant Professor and DPD Director

Responsibility Role: PRINCIPAL_INVESTIGATOR

Locations

University of Vermont

Burlington, Vermont, United States

Countries

United States

Other Identifiers

029898

Identifier Type: -

Identifier Source: org_study_id