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Shop For Success: Experimental Grocery Store Study

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ClinicalTrials.gov Identifier: NCT04097262
Recruitment Status : Recruiting
First Posted : September 20, 2019
Last Update Posted : September 20, 2019
Sponsor:
Information provided by (Responsible Party):
Lisa Jahns, USDA Grand Forks Human Nutrition Research Center

Brief Summary:
The purpose of this research is to study how the price of foods affects food buying choices at the grocery store. The researchers are interested in this topic because the price of foods can have a big impact on what people choose to buy and prices change over time. The researchers are doing this study to see how changes in food prices affect what foods mothers choose for their families.

Condition or disease Intervention/treatment Phase
Overweight Obesity Other: Own-Price Elasticity Other: Cross-Price Elasticity Not Applicable

Detailed Description:
It is well known that the price of a given food affects the amount of that food an individual purchases. However, little is known about how specific groups, such as overweight/obese and those with lower incomes, change their food purchasing decisions depending on food price changes. Evidence has shown that these groups have lower quality diets and worse health outcomes than their normal weight and higher income counterparts. Therefore, it is important to gain a better understanding of how food price changes affect purchasing decisions among these populations in order to develop targeted nutrition interventions to improve their diet quality. To investigate this, the researchers will create a laboratory-based grocery store, in which pictures of foods will be used to substitute actual food. Food prices will be indicated on each picture. Participants will be given play money and a budget, and ask them to "purchase" foods in the mock grocery store. The price of food will be changed throughout the study to investigate how participants change their purchasing decisions based on these price changes.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 80 participants
Allocation: Randomized
Intervention Model: Factorial Assignment
Intervention Model Description: This study will utilize a three factor design, with one between-subject factor and two within-subject factors. The between-subject factor is participation in a federal food assistance program. The within-subject factors are price change condition and price change scenario.
Masking: None (Open Label)
Primary Purpose: Other
Official Title: Price Elasticity of Fruit (Shop For Success)
Actual Study Start Date : August 22, 2019
Estimated Primary Completion Date : April 30, 2020
Estimated Study Completion Date : April 30, 2020

Arm Intervention/treatment
Experimental: Own-Price Elasticity
The price of fruit will vary (own-price elasticity) while the price of all other foods in the "mock" grocery store will remain constant.
Other: Own-Price Elasticity
The price of fruit will be 75%, 100%, or 125% of the reference price, but the price of other foods will remain the same.

Experimental: Cross-Price Elasticity
The price of fruit will remain constant while the price of other foods in the "mock" grocery store will vary (cross-price elasticity).
Other: Cross-Price Elasticity
The price of fruit will remain the same, but the price of other foods will be 75%, 100%, or 125% of the reference price.




Primary Outcome Measures :
  1. Price elasticity of fruit [ Time Frame: Baseline ]
    Percent change in the amount of fruit purchased (gram weight) for every percent change in the price of a given food.


Secondary Outcome Measures :
  1. Nutrient density of purchased foods [ Time Frame: Baseline ]
    Ratio of low nutrient-dense food purchases to high nutrient-dense food purchases



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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Have at least one child up to 18 years of age residing in the household
  • Primary grocery shopper for the household
  • No health conditions or food practices that substantially limit food choice
  • Not currently pregnant
  • Consent to the study design

Exclusion Criteria:

  • Male
  • < 18 years of age
  • Not a mother, or children not living with subject in their household
  • No children below the age of 18 years of age
  • Not the primary grocery shopper for their household
  • Health conditions or food practices that substantially limit food choice
  • Currently pregnant

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04097262


Contacts
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Contact: Lisa Jahns, PhD 701-795-8331 lisa.jahns@usda.gov
Contact: Danyelle Osowski, MS 701-795-8295 danyelle.osowski@usda.gov

Locations
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United States, North Dakota
USDA Grand Forks Human Nutrition Research Center Recruiting
Grand Forks, North Dakota, United States, 58203
Contact: Angela J Scheett, MPH, RD    701-795-8386    angela.scheett@usda.gov   
Sponsors and Collaborators
USDA Grand Forks Human Nutrition Research Center
Investigators
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Principal Investigator: Lisa Jahns, PhD USDA Grand Forks Human Nutrition Research Center

Additional Information:
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Responsible Party: Lisa Jahns, Research Nutritionist, USDA Grand Forks Human Nutrition Research Center
ClinicalTrials.gov Identifier: NCT04097262     History of Changes
Other Study ID Numbers: GFHNRC155
First Posted: September 20, 2019    Key Record Dates
Last Update Posted: September 20, 2019
Last Verified: September 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Overweight
Body Weight
Signs and Symptoms