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The effects of 100% wild blueberry (Vaccinium angustifolium) juice consumption on cardiometablic biomarkers: a randomized, placebo-controlled, crossover trial in adults with increased risk for type 2 diabetes.

BMC Nutr. 2017 May 25;3:45.
The effects of 100% wild blueberry (Vaccinium angustifolium) juice consumption on cardiometablic biomarkers: a randomized, placebo-controlled, crossover trial in adults with increased risk for type 2 diabetes.
Stote KS1, Sweeney MI2, Kean T2, Baer DJ3, Novotny JA3, Shakerley NL4, Chandrasekaran A4, Carrico PM5, Melendez JA4, Gottschall-Pass KT2.
Author information
1 Division of Science, Mathematics and Technology, State University of New York, Empire State College, 113 West Avenue, Saratoga Springs, NY 12866 USA.
2 Departments of Biology (MIS), Applied Human Sciences (KTG) and School of Nursing (TK) University of Prince Edward Island, Charlottetown, Prince Edward Island Canada.
3 Beltsville Human Nutrition Research Center, US Department of Agriculture, Agriculture Research Service, Beltsville, USA.
4 Nanobioscience Constellation, State University of New York Polytechnic Institute, Albany, NY USA.
5 Department of Biology, State University of New York, University at Albany, Albany, USA.
Abstract
BACKGROUND:
Wild blueberries have a high content of polyphenols, but there is limited data evaluating their health benefits in adults at risk for type 2 diabetes. The objective of the study was to investigate whether consumption of 100% wild blueberry juice improves cardiometabolic biomarkers associated with type 2 diabetes risk.
METHODS:
A single-blind, randomized, placebo-controlled, crossover design trial was conducted in which adults (women, n = 19, ages 39-64 y) at risk for type 2 diabetes consumed 240 mL of wild blueberry juice or a placebo beverage as part of their free-living diet for 7 days. Blood was collected to determine various biomarkers such as fasting plasma glucose, fasting serum insulin, surrogate markers of insulin sensitivity, triglycerides, inflammation (interleukin-6, interleukin-10, high-sensitivity C-reactive protein, tumor necrosis factor-alpha, serum amyloid A), adhesion molecules (soluble intercellular adhesion molecule-1, soluble vascular adhesion molecule-1), oxidative stress (LDL-oxidation, total 8-isoprostanes), and nitric oxide. Endothelial function and blood pressure were also assessed.
RESULTS:
Wild blueberry juice consumption for 7 days produced no significant changes in glucose, insulin, insulin sensitivity, triglycerides, inflammatory markers, adhesion molecules, oxidative stress, endothelial function or blood pressure. However, wild blueberry juice consumption showed a trend for lowering systolic blood pressure: 120.8 ± 2.2 mmHg in the placebo group vs 116.0 ± 2.2 mmHg in the blueberry juice group (P = 0.088). Serum concentrations of nitrates and nitrites, an index of nitric oxide production, increased from 2.9 ± 0.4 μM after placebo drink to 4.1 ± 0.4 μM after drinking wild blueberry juice (P = 0.039).
CONCLUSIONS:
Short-term consumption of wild blueberry juice may promote cardioprotective effects, by improving systolic blood pressure, possibly through nitric oxide production, in adults at risk for type 2 diabetes. This outcome warrants longer-term human studies of blueberries, including defined amounts of either the whole fruit or juice, to clarify whether polyphenol-rich foods can be efficacious for improving cardiometabolic biomarkers in adults at risk for type 2 diabetes.
TRIAL REGISTRATION:
NCT02139878, clinicaltrials.gov; date of registration: May 4, 2014.
© The Author(s). 2017.
KEYWORDS:
100% wild blueberry juice; Blood pressure; Endothelial function; Nitric oxide; Risk factors for type 2 diabetes
Blueberries improve endothelial function, but not blood pressure, in adults with metabolic syndrome: a randomized, double-blind, placebo-controlled clinical trial.
Stull AJ1,2, Cash KC3, Champagne CM4, Gupta AK5, Boston R6, Beyl RA7, Johnson WD8,9, Cefalu WT10,11.
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