Ignite Creation Date:
2025-12-25 @ 12:37 AM
Ignite Modification Date:
2026-02-26 @ 12:06 PM
Study NCT ID:
NCT03567967
Status:
COMPLETED
Last Update Posted:
2020-07-17
First Post:
2018-05-31
Is NOT Gene Therapy:
True
Has Adverse Events:
False
Brief Title:
Fruit and Vegetable Vouchers With and Without an SSB Tax
Sponsor:
Stanford University
Organization:
Study Overview
Official Title:
The EValuating Interventions in Diabetogenic Environments Through Natural Controlled Experiments (EVIDENCE) Trial
Status:
COMPLETED
Status Verified Date:
2020-07
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
EVIDENCE
Brief Summary:
We aim to examine whether a purchasing incentive for healthy foods has the same effect on dietary intake in a community with and a community without a purchasing penalty for unhealthy foods. We will perform a randomized non-inferiority trial in two locations, San Francisco (SF) and Los Angeles (LA) to test whether a voucher for purchasing fresh fruits and vegetables has a similar effect in LA and in SF, where the former does not but the latter does have a tax on sugar-sweetened beverages. Participants will be recruited from 4 neighborhoods (N=312) with 2 SF neighborhoods (exposed to the SSB tax) and 2 LA neighborhoods (not exposed to the SSB tax).
Detailed Description:
We will test the hypothesis that a positive incentive for healthy foods (fresh fruits and vegetables, F\&Vs) will be utilized as effectively in a community without a purchasing penalty for unhealthy foods (a sugar-sweetened beverage \[SSB\] tax) as in a community with a purchasing penalty for unhealthy foods (a SSB tax). Our experiment will test the empirically-driven hypothesis in a real-world setting through a noninferiority design: comparing the impact of F\&V vouchers in two counties, one without (Los Angeles) and one with (San Francisco) a SSB tax.
Each study participant will receive four paper vouchers per month for a total of six months. Each of these vouchers can be redeemed for fresh or frozen fruits and vegetables at a number of specified local corner stores, supermarkets, or farmer's markets.
Half of these participants will receive and spend these vouchers in an environment which has implemented a SSB tax (SF); the other half will receive and spend these same vouchers in a non-tax environment (LA).
Each individual participant will be enrolled in the study for a total of seven months from initial orientation and participant consent (M0) to final data collection during final month of intervention (M6).
We are using a non-inferiority trial design. We are aiming to test whether there is a significant difference in total cup-equivalents of F\&V intake in LA participants as compared to SF participants when given F\&V vouchers. That is, we aim to test whether the F\&V voucher is less effective in LA than in SF. This is important to test because it has been purported that SF has a unique food environment with high accessibility to fresh F\&V through farmer's markets and a plethora of corner stores, as well as a SSB tax that discourages less healthy foods, potentially leaving more funds for healthier F\&Vs. Thus, we aim to determine the change in consumption of F\&V in LA participants is non-inferiority to that of SF participants, when both are given F\&V vouchers.
Each study participant will receive four paper vouchers per month for a total of six months. Each of these vouchers can be redeemed for fresh or frozen fruits and vegetables at a number of specified local corner stores, supermarkets, or farmer's markets.
Half of these participants will receive and spend these vouchers in an environment which has implemented a SSB tax (SF); the other half will receive and spend these same vouchers in a non-tax environment (LA).
Each individual participant will be enrolled in the study for a total of seven months from initial orientation and participant consent (M0) to final data collection during final month of intervention (M6).
We are using a non-inferiority trial design. We are aiming to test whether there is a significant difference in total cup-equivalents of F\&V intake in LA participants as compared to SF participants when given F\&V vouchers. That is, we aim to test whether the F\&V voucher is less effective in LA than in SF. This is important to test because it has been purported that SF has a unique food environment with high accessibility to fresh F\&V through farmer's markets and a plethora of corner stores, as well as a SSB tax that discourages less healthy foods, potentially leaving more funds for healthier F\&Vs. Thus, we aim to determine the change in consumption of F\&V in LA participants is non-inferiority to that of SF participants, when both are given F\&V vouchers.
Study Oversight
Has Oversight DMC:
True
Is a FDA Regulated Drug?:
False
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?: