Multi-level Supermarket Discount Study

Study Overview
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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.

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.

Official Title
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Multi-level Supermarket Discounts of Fruits and Vegetables' Impact on Intake and Health

Conditions
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Obesity

Intervention / Treatment
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* Behavioral: Discount Intervention


Participation Criteria
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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

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 70 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Experimental 15% discount intervention<br>15% discount on fruits, vegetables and non-caloric beverages at the designated supermarkets | Behavioral: Discount Intervention<br>* 15% or 30% discount on fruits and vegetables<br>|
| Experimental: Experimental 30% discount intervention<br>30% discount on fruits, vegetables and non-caloric beverages at the designated supermarkets | Behavioral: Discount Intervention<br>* 15% or 30% discount on fruits and vegetables<br>|
| No Intervention: No intervention control group<br>0% discount on fruits, vegetables and non-caloric beverages at the designated supermarkets | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Individual consumption behaviors | Fruit and vegetable intake as assessed by 24-h dietary recalls | Week 0 | 
| Individual consumption behaviors | Fruit and vegetable intake as assessed by 24-h dietary recalls | Week 8 | 
| Individual consumption behaviors | Fruit and vegetable intake as assessed by 24-h dietary recalls | Week 24 | 
| Individual consumption behaviors | Fruit and vegetable intake as assessed by 24-h dietary recalls | Week 40 | 
| Individual consumption behaviors | Fruit and vegetable intake as assessed by 24-h dietary recalls | Week 56 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Body Weight | Body weight (kg) | Week 0 | 
| Body Weight | Body weight (kg) | Week 8 | 
| Body Weight | Body weight (kg) | Week 24 | 
| Body Weight | Body weight (kg) | Week 40 | 
| Body Weight | Body weight (kg) | Week 56 | 
| Body Mass Index (BMI) | BMI (kg/m2) | Week 0 | 
| Body Mass Index (BMI) | BMI (kg/m2) | Week 8 | 
| Body Mass Index (BMI) | BMI (kg/m2) | Week 24 | 
| Body Mass Index (BMI) | BMI (kg/m2) | Week 40 | 
| Body Mass Index (BMI) | BMI (kg/m2) | Week 56 | 
| Percent Body Fat | % body fat | Week 56 | 
| Percent Body Fat | % body fat | Week 0 | 
| Percent Body Fat | % body fat | Week 8 | 
| Percent Body Fat | % body fat | Week 24 | 
| Percent Body Fat | % body fat | Week 40 | 
| Waist Circumference | Waist circumference (cm) Metabolic risk factors (fasting glucose, cholesterol, blood pressure) and metabolic syndrome | Week 0 | 
| Waist Circumference | Waist circumference (cm) Metabolic risk factors (fasting glucose, cholesterol, blood pressure) and metabolic syndrome | Week 8 | 
| Waist Circumference | Waist circumference (cm) Metabolic risk factors (fasting glucose, cholesterol, blood pressure) and metabolic syndrome | Week 24 | 
| Waist Circumference | Waist circumference (cm) Metabolic risk factors (fasting glucose, cholesterol, blood pressure) and metabolic syndrome | Week 40 | 
| Waist Circumference | Waist circumference (cm) Metabolic risk factors (fasting glucose, cholesterol, blood pressure) and metabolic syndrome | Week 56 | 
| Fasting glucose | Fasting glucose level | Week 0 | 
| Fasting glucose | Fasting glucose level | Week 8 | 
| Fasting glucose | Fasting glucose level | Week 24 | 
| Fasting glucose | Fasting glucose level | Week 40 | 
| Fasting glucose | Fasting glucose level | Week 56 | 
| Cholesterol Level | Cholesterol level | Week 0 | 
| Cholesterol Level | Cholesterol level | Week 8 | 
| Cholesterol Level | Cholesterol level | Week 24 | 
| Cholesterol Level | Cholesterol level | Week 40 | 
| Cholesterol Level | Cholesterol level | Week 56 | 
| Blood Pressure | Blood pressure (diastolic/systolic) | Week 0 | 
| Blood Pressure | Blood pressure (diastolic/systolic) | Week 8 | 
| Blood Pressure | Blood pressure (diastolic/systolic) | Week 24 | 
| Blood Pressure | Blood pressure (diastolic/systolic) | Week 40 | 
| Blood Pressure | Blood pressure (diastolic/systolic) | Week 56 | 
| Gross weekly purchasing of fruits and vegetables | Gross weekly purchasing of fruits and vegetables from the discounted items list in dollars | Week 8-56 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Nutrition