The GRoceries Aimed at Increasing Nutrition Study (GRAIN

Recruiting

45 years - 70 years

All

216 participants needed

1 Location

Brief description of study

We are looking for adults ages 45-70 to take part in an 18-week study about people‘s online grocery shopping habits. You’ll get a free Walmart+ membership for your grocery deliveries and receive $10 back on all weekly orders over $35. You may earn over $200 in total for completing study tasks.

Detailed description of study

The purpose of the study is to learn more about your online grocery shopping habits. Your participation will last 18 weeks.

If you are eligible and consent to participating, you will be asked to:

Schedule an Enrollment Call: You’ll schedule an enrollment call to review the consent form and decide if you want to join the study.
Create or Use an Existing Walmart+ Account: You’ll share your login details so we can place your orders on your behalf. Your login details will be securely stored using a Penn-approved software (Dashlane). You’ll enter and manage your own credit card information in Walmart+. The cost of a Walmart+ account will be covered by us during the time you’re in the study.
Complete a Baseline Survey: At the start of the study, you’ll fill out a 15-minute survey about your food and grocery habits.
Shop in an Online Grocery Store: You’ll shop online weekly using the study’s grocery store, ‘Lola’s,’ for 18 weeks. Lola’s mimics Walmart+ in both appearance and product selection. After selecting your items, we’ll arrange delivery via Walmart+ based on your chosen delivery time and address. You’ll pay for your groceries. SNAP/EBT or other food assistance benefits cannot be used to pay for groceries in this study.
Complete a Follow-Up Survey: After 18 weeks, you’ll complete a 15-minute survey about your food and grocery habits.

You’ll be paid for participating in the study:

$15 for completing the baseline survey
$20 for your first grocery purchase
$10 each week in weeks 2 – 14 for completing an order of at least $35
An extra $10 for shopping during Week 5
$25 for completing the final survey

Eligibility of study

You may be eligible for this study if you meet the following criteria:

Conditions: prediabetes, diabetes
Age: 45 years - 70 years
Gender: All

Inclusion

Age 45 to 70 years.
Able to provide consent.
Resident of Philadelphia, Bucks, Delaware, Chester, or Montgomery Counties in Pennsylvania.
Consume <5 servings of whole grains per week.
Comfortable shopping online.
Have access to a credit or debit card to pay for groceries purchased.
Have reliable internet access.
Speak English.
Penn Medicine patient diagnosed with prediabetes or diabetes (identified using EHR codes R73.03 or E11).

Exclusion

Does not meet all the inclusion criteria.
Not able to speak English.
Not able to provide consent.

Updated on 02 Apr 2026. Study ID: 25-0359

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