Food-for-Families: Experimental Grocery Store Study

Food-for-Families: Relationship Between Income, Obesity, and Food Purchasing Using an Experimental Grocery Store Study

This is a study about how the price of foods affects 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 item 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 on 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 price 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. The 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.

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.

The price of eggs will vary (own-price elasticity) while the price of other foods in the "mock" grocery store will remain constant.

The eggs will remain constant while the price of other foods in the "mock" grocery store will vary (cross-price elasticity).

The price of eggs will be 75%, 100%, or 125% of the reference price, but the price of other foods will remain the same.

The price of eggs will remain the same, but the price of other foods will be 75%, 100%, or 125% of the reference price.

Percent change in the amount of eggs purchased (gram weight) for every percent change in the price of a given food.

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