Optimizing Lifestyles Through Increased Vegetable-rich Eating Pilot Study (OLIVE Pilot)

April 6, 2026 updated by: Brie Turner-McGrievy, University of South Carolina

Building on the Dietary Guidelines: 3 Dietary Pattern (DG3D) Study - Testing a Teaching Kitchens and Food is Medicine Approach for Type 2 Diabetes Prevention

The goal of this pilot clinical trial is to examine how receipt of ingredients for a Mediterranean diet (with or without nutrition classes) impacts Type 2 Diabetes Mellitus risk factors among adults in the US South. The main question it aims to answer is:

- Will greater improvements in diet quality (HEI Score) and body weight be seen in the group that receives grocery delivery and nutrition classes (TK+FiM) compared to the group receiving grocery delivery only (FiM only)?

Researchers will evaluate the changes in diet quality and body weight among participants in each group to see which group experiences greater improvements.

Participants will:

  • be randomly assigned to either receive weekly grocery deliveries and attend weekly virtual nutrition classes for 4 weeks or receive weekly grocery deliveries only.
  • be asked to complete surveys/questionnaires at the baseline and 4-week timepoints in the study.
  • be asked to participate in a post-study focus group to talk about their experiences during the intervention.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

40

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • 18-65 years of age
  • BMI between 25- 49.9 kg/m2
  • Live in a southern state (as classified by the US Census)
  • Be able to complete all survey assessments via computer or phone
  • Have a wi-fi connection at home or other site to access Zoom-delivered interventions
  • Have three or more type 2 diabetes risk factors (NIDDK Risk factors for T2DM)
  • Own a digital body weight scale, have regular access, or be willing to purchase one

Exclusion Criteria:

  • Currently participating in a weight loss program or taking weight loss medications
  • Has lost more than 10 pounds in the past 6 months
  • Diagnosed with major health or psychiatric diseases, drug or alcohol dependency, thyroid conditions, diabetes, or pregnancy
  • Pregnant (or have been pregnant in the last 6 months), anticipating on becoming pregnant in the next 3 months, or currently breastfeeding
  • Diagnosed with an eating disorder as screened by the Eating disorder Screen for Primary care [ESP].

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: FiM only
Active control receiving weekly grocery delivery with no virtual teaching kitchen (TK) Mediterranean diet intervention
Behavioral: Food is Medicine Grocery Provision (FiM)
Participants will receive a delivery of up to $25 worth of grocery ingredients that support a Mediterranean diet each week for 4 weeks.
Experimental: FiM+TK
Virtual teaching kitchen (TK) Mediterranean diet intervention plus weekly grocery delivery
Behavioral: Food is Medicine Grocery Provision (FiM)
Participants will receive a delivery of up to $25 worth of grocery ingredients that support a Mediterranean diet each week for 4 weeks.
Behavioral: Dietary Intervention Teaching Kitchen (TK) Classes
Participants will attend virtual classes once per week for 4 weeks.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Changes in Healthy Eating Index Score
Time Frame: 4 weeks
Changes in dietary quality as assessed by the Healthy Eating Index (HEI-2020; scale range 0-100 where a higher score means better dietary quality)
4 weeks
Changes in body weight
Time Frame: 4 weeks
Changes in body weight
4 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of South Carolina

Investigators

  • Principal Investigator: Brie Turner-McGrievy, PhD, MS, RD, University of South Carolina

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 1, 2026

Primary Completion (Estimated)

July 1, 2026

Study Completion (Estimated)

July 1, 2027

Study Registration Dates

First Submitted

March 25, 2026

First Submitted That Met QC Criteria

March 30, 2026

First Posted (Actual)

April 3, 2026

Study Record Updates

Last Update Posted (Actual)

April 13, 2026

Last Update Submitted That Met QC Criteria

April 6, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • STUDY00000687

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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