Clinical Trials Logo

Clinical Trial Summary

This study aims to use a three-arm randomized control trial (RCT) implemented in a fully functional experimental online grocery store, to explore the effects of two low-cost information and incentive-based strategies. These strategies comprise of injunctive norm-based messaging and the use of financial incentive leveraging on loss aversion to encourage the purchase of healthy foods. By leveraging a partnership with a local, commercial online grocery provider, the investigators have set up an integrated store wherein products will be purchased by participants and subsequently delivered to homes. This increases the external validity of these interventions and enables investigators to establish greater confidence in their generalizability.


Clinical Trial Description

The Asia-Pacific is faced with an epidemic of rising rates of chronic disease. Poor diet quality is a demonstrated risk factor for non-communicable diseases. Excess intake of calories, saturated fat and sodium increases the risk of obesity, heart disease, diabetes, and other chronic conditions. Behavioral economics has emerged as a promising strategy to increase the effectiveness of interventions aimed to address risk factors for non-communicable diseases (NCDs). Yet, there is a gap in knowledge concerning how norm-based messaging and peer influence interventions can be implemented to improve diet quality. Using a three-arm randomized trial with a 3x3 crossover design, investigators aim to determine whether norm-based messaging and peer comparisons, with or without financial incentives, improve diet quality. Each participant will be exposed to all of the following intervention arms in random order: Arm 1: Control arm. Participants will experience an unmodified version of NUSMart which replicates the traditional shopping experience of online grocery stores. Arm 2: Participants will experience a modified version of NUSMart with norm-based messaging and peer comparison features enabled. Nutri-Score labels will be enabled and displayed on all products within the store. A floating side panel will provide a visual indicator of the participants' average weighted Nutri-Score. Arm 3: Same as Arm 2, except participants are notified of an additional $5 reward towards participation reimbursement. However, this additional $5 will be forfeited if the basket average weighted Nutri-Score falls below the average of participants' peers'. (Financial incentive leveraging on loss aversion). Investigators hypothesize the following: Primary hypothesis: Diet quality, as measured by mean Nutri-Score weighted by number of servings of all basket items, will be greatest when exposed to the intervention with norm-based messaging with incentive (Arm 3), followed by the intervention with norm-based messaging without the incentive (Arm 2), followed by Control (Arm 1). Investigators will test this hypothesis in total, and separately for foods and beverages given Singapore's focus on reducing intake of sugar-sweetened beverages. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT05070442
Study type Interventional
Source Duke-NUS Graduate Medical School
Contact Jyotika Puri, BSoc.Sc
Phone +65 6601 6442
Email [email protected]
Status Not yet recruiting
Phase N/A
Start date October 2021
Completion date March 2022

See also
  Status Clinical Trial Phase
Recruiting NCT05049005 - Alternative Dietary Approaches Online to Promote Tracking N/A
Completed NCT05007184 - Understanding Food Choices in Saudi Arabia N/A
Active, not recruiting NCT03394326 - Eat Healthy for Families N/A
Not yet recruiting NCT04994938 - Peer-Led Diet and Exercise Intervention N/A
Recruiting NCT04762251 - What Or When to Eat to Reduce the Risk of Type 2 Diabetes (WOW) N/A
Completed NCT04632212 - Understanding Food Choices N/A
Not yet recruiting NCT05018026 - Understanding Grocery Shopping Behaviour N/A