Multi-level Supermarket Discount Study

Study Results

Results available

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Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

167 participants

Study Classification

INTERVENTIONAL

Study Start Date

2016-09-01

Study Completion Date

2022-11-15

Brief Summary

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The study team's objective is to test the effect of supermarket discount levels on fruit and vegetable (F\&V) and non-caloric beverage purchasing and consumption, as well as health outcomes. The study team will implement this economic intervention in a local supermarket chain to assess the effects of a 32-week intervention of fruit and vegetable (F\&V) and non-caloric beverage discounts of 30%, 15%, and 0% (control group) on purchasing, dietary intake, and health outcomes, including body weight and composition, blood pressure, and biochemical markers of cardiovascular disease risk. The 32-week intervention will be preceded by an 8-week baseline and will have a follow-up period of 16 weeks. There will be no discounts in effect during the baseline and follow-up periods.

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Detailed Description

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The objective is to test the effect of supermarket discount levels on fruit and vegetable (F\&V) and non-caloric beverage purchasing and consumption, as well as health outcomes. The study team will implement this economic intervention in a local supermarket chain to assess the effects of a 32-week intervention of fruit and vegetable (F\&V) and non-caloric beverage discounts of 30%, 15%, and 0% (control group) on purchasing, dietary intake, and health outcomes, including body weight and composition, blood pressure, and biochemical markers of cardiovascular disease risk. The prediction is that the impact will increase with the level of discount. The 32-week intervention will be preceded by an 8-week baseline and will have a follow-up period of 16 weeks. There will be no discounts in effect during the baseline and follow-up periods. The prediction is that some of the interventional effects will carry over to the follow-up period.

Conditions

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Obesity

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

TREATMENT

Blinding Strategy

SINGLE

Outcome Assessors

Study Groups

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Experimental 15% discount intervention

15% discount on fruits, vegetables and non-caloric beverages at the designated supermarkets

Group Type EXPERIMENTAL

Discount Intervention

Intervention Type BEHAVIORAL

15% or 30% discount on fruits and vegetables

Experimental 30% discount intervention

30% discount on fruits, vegetables and non-caloric beverages at the designated supermarkets

Group Type EXPERIMENTAL

Discount Intervention

Intervention Type BEHAVIORAL

15% or 30% discount on fruits and vegetables

No intervention control group

0% discount on fruits, vegetables and non-caloric beverages at the designated supermarkets

Group Type NO_INTERVENTION

No interventions assigned to this group

Interventions

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Discount Intervention

15% or 30% discount on fruits and vegetables

Intervention Type BEHAVIORAL

Eligibility Criteria

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Inclusion Criteria

* BMI: 24.5 - 50
* Weight Stable (±5% body weight in last 3 mo)
* Accessible by telephone
* Living in NYC and not planning move
* Primary household food shopper
* ≥50% of food shopping at Foodtown/Brooklyn Harvest and agrees to 100% shopping at store during study
* Consumption of \>50% of food shopping
* Eat out or take out ≤5 times weekly

Exclusion Criteria

* Pregnant or contemplating pregnancy
* Enrolled in related studies
* Active weight loss program
* Presence of serious medical (e.g. cancer, diabetes) or psychiatric disease (e.g. bipolar)
* Changes in medications or smoking in past 3 mo
* Excessive alcohol use (≥4 drinks/day) or illicit drug use
* Planning a vacation ≥ 4 consecutive weeks or 6 total weeks during study
* Receiving SNAP benefits

Minimum Eligible Age

18 Years

Maximum Eligible Age

70 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes