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Understanding Dose Related Effects of Strawberry
Sponsor: Clinical Nutrition Research Center, Illinois Institute of Technology
Summary
The proposed research is designed to extend previous research findings building on the knowledge of strawberries as fruits that support a healthy immune and vascular system. The proposed research leverages a recently funded proposal by the USDA to study in greater depth inflammation, glucoregulation and oxidative stress defense and their relation to improving endothelial function and insulin sensitivity. Before and after strawberry intake, blood samples will be collected for monocyte (immune cells and source of inflammatory cytokines) isolation and activation via changes in cellular NF-κB and Nrf-2 (key transcription factors of inflammation/oxidative stress defense) status along with products of their activation (ie., plasma cytokines). Because inflammation and oxidative stress impairs endothelial function and insulin sensitivity, acutely and chronically, investigators will also study changes in vascular and insulin sensitivity status, assessing changes in vascular adhesion molecules, endothelial responsiveness through flow mediated vasodilation (ie., FMD) and insulin sensitivity using the Liquid Meal Tolerance (LMTT) if intravenous glucose tolerance test (IVGTT) method cannot be used due to supply chain issues of sterile Dextrose. Glucoregulation will be assessed by placing a Continuous Glucose monitoring (CGM) machine (Dexcom-6) to participants for 10 days at the beginning and at the end of the study period of intervention. The study will be a randomized, double-blinded, 3-arm parallel, 4-week, dose-response study. Individuals with chronic low grade inflammation will be sought to test the anti-inflammation - vaso-relaxing - insulin sensitivity effects of strawberry.
Official title: Understanding Dose Related Effects of Strawberry Intake on Chronic Inflammation, Oxidative Stress, and Their Relationship With Endothelial Function and Insulin Sensitivity
Key Details
Gender
All
Age Range
20 Years - 60 Years
Study Type
INTERVENTIONAL
Enrollment
66
Start Date
2022-08-31
Completion Date
2026-01-28
Last Updated
2025-07-11
Healthy Volunteers
Yes
Interventions
freeze-dried whole strawberry powder 36 g powder
After day 1 measurements, subjects will be given their first intervention drink (powder plus water) according to their randomization to 3 cup FW equivalent of strawberries. The freeze-dried whole strawberry powder (36 g powder) requested from the California Strawberry Commission. All drinks will be standardized to 41 g powder to match USDA Control arm.
freeze-dried whole strawberry powder 12 g
After day 1 measurements, subjects will be given their first intervention drink (powder plus water) according to their randomization to 1 cup FW equivalent of strawberries. The freeze-dried whole strawberry powder (12 g powder) requested from the California Strawberry Commission. All drinks will be standardized to 41 g powder to match USDA Control arm.
freeze-dried control powder 0 g strawberry
After day 1 measurements, subjects will be given their first intervention drink (powder plus water) according to their randomization to 0 cup FW equivalent of strawberries. The freeze-dried powder is used as a control. All drinks will be standardized to 41 g powder to match USDA Control arm.
Locations (1)
Clinical Nutrition Research Center
Chicago, Illinois, United States