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Mediterranean Diet and Blood Sugar Study
Glycemic Effects of a Mediterranean-Style Dietary Pattern Containing Potatoes in Adults With Prediabetes
Who can join
Ages 25 to 65 · All sexes
Full eligibility criteria
Inclusion Criteria: * Age 25-65 years * Prediabetes assessed by an HbA1c of 5.7-6.4% or fasting glucose 100-125 mg/dL at screening * BMI 25-40 kg/m2 at screening Exclusion Criteria: * HbA1c ≥6.5% at screening * LDL-C (calculated with the Martin-Hopkins equation) ≥190 mg/dL at screening * Hemoglobin \<13.2 g/dL at screening * Fasting triglycerides \>350 mg/dL at screening -≥10% change in body weight within the 6 months prior to enrollment * Blood pressure \>140/90 mmHg at screening * Type 1 or type 2 diabetes * Prescription of anti-hypertensive, lipid-lowering, or glucose-lowering drugs * Intake of supplements that affect the outcomes of interest (i.e., lipid, blood pressure, or glucose lowering; vitamin C or multi-vitamins containing vitamin C) and are unwilling to cease during the study period. * History of liver, kidney, or autoimmune disease * Prior cardiovascular event (e.g., stroke, heart attack) * Current pregnancy or intention of pregnancy within the next 6 months * Lactation within the prior 6 months * Allergy/intolerance/sensitivity/dislike of any foods in the study menus * Antibiotic use within the prior 1 month * Oral steroid use within the prior 1 month * Use of tobacco or nicotine-containing products within the past 6 months * History of cancer at any site within the past 10 years (eligible if ≥10 years without recurrence) or non-melanoma skin cancer within the past 5 years (eligible if ≥5 years without recurrence) * Participation in another clinical trial within 60 days of baseline * Currently following a restricted or weight-loss diet * Prior bariatric surgery * Intake of \>14 alcoholic drinks/week and/or not willing to avoid alcohol consumption for 48 hours prior to test visits * Principal Investigator discretion related to the potential participant's ability to adhere to the study requirements, including being able to come to attend visits * Does not speak and/or understand English * Unwilling to refrain from donating blood during the study * Weight \<110 lb
About the study
The purpose of this research study is to determine if a healthy Mediterranean diet containing one medium potato/day has equivalent or non-different effects on risk factors for type 2 diabetes and heart disease compared to a healthy Mediterranean diet without potatoes in adults with prediabetes. Participants will be randomly assigned to one of the test diets and be asked to consume this diet for 12 weeks (84 days). Testing will be conducted at the beginning and end of the study.
What is being tested
- Mediterranean-style diet with potatoes (other)
- Traditional-style Mediterranean diet (other)
Sponsor: Penn State University · Participants: 74 · Started: Aug 26, 2026
Contact the study team
- Kristina Petersen, PhD · Phone: 814-865-7206
- Stacey Meily · Phone: 814-863-8622
Official record on ClinicalTrials.gov — NCT07229781
Locations in the U.S.
| Pennsylvania | The Pennsylvania State University, University Park |
Conditions
From ClinicalTrials.gov, data retrieved Oct 6, 2026. Each study sets its own eligibility; the study team decides who can join.