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This is a study about how the price of foods affects food buying choices at the grocery store. The price of foods can have a big impact on what people choose to buy and prices change over time. This study is being done to see how changes in food prices affect what mothers choose for their families.
It is well known that the price of a given food affects the amount of that individuals will purchase. Yet little is known about how specific groups, such as obese/overweight individuals and those with lower incomes, change their food purchasing decisions depending food price changes. Evidence shows 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 prices changes affect purchasing decisions among these population groups 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 in lieu of actual foods. Food prices will be indicated on each picture. Participants will be given play money and a budget, and asked to "purchase" foods in the mock grocery store. The price of foods will be changed throughout the study to investigate how participants change their purchasing decisions based on these price changes.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Own-Price Elasticity | Experimental | The price of vegetables will vary (own-price elasticity) while the price of all other foods in the "mock" grocery store will remain constant. |
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| Cross-Price Elasticity | Experimental | The price of vegetables will remain constant while the price of other foods in the "mock" grocery store will vary (cross-price elasticity). |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Own-Price Elasticity | Other | The price of vegetables will be 75%, 100%, or 125% of the reference price, but the price of other foods will remain the same. |
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| Measure | Description | Time Frame |
|---|---|---|
| Price elasticity of vegetables | Percent change in the amount of vegetables purchased (gram weight) for every percent change in the price of a given food. | Baseline |
| Measure | Description | Time Frame |
|---|---|---|
| Nutrient density of purchased foods | Ratio of low nutrient-dense food purchases to high nutrient-dense food purchases | Baseline |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| James Roemmich, PhD | USDA Grand Forks Human Nutrition Research Center | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| USDA Grand Forks Human Nutrition Research Center | Grand Forks | North Dakota | 58203 | United States |
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| ICF | No | No | Yes | Informed Consent Form | Aug 9, 2019 | Jan 18, 2022 | ICF_000.pdf |
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| ID | Term |
|---|---|
| D050177 | Overweight |
| D009765 | Obesity |
| ID | Term |
|---|---|
| D044343 | Overnutrition |
| D009748 | Nutrition Disorders |
| D009750 | Nutritional and Metabolic Diseases |
| D001835 | Body Weight |
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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.
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| Cross-Price Elasticity | Other | The price of vegetables will remain the same, but the price of other foods will be 75%, 100%, or 125% of the reference price. |
|
| D012816 |
| Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |