Consumption of blueberry supplement did not show significant improvement in metabolic health markers, however, it induced changes in gene expression, indicating a potential longer-term effect.
Randomised Controlled Trial Blueberry
The methodology of the study involved a randomized double-blind placebo-controlled intervention trial conducted with adults at risk of developing Metabolic Syndrome (MetS). Participants, consisting of 49 individuals, were asked to consume 50 grams daily of either a freeze-dried highbush blueberry powder or a placebo powder for a duration of 8 weeks. Metabolic Syndrome phenotypes were evaluated at the beginning, 4 weeks in, and at the end of the trial. To assess any metabolic changes, fasting blood gene expression profiles and plasma metabolomic profiles were observed at the start and the end of the 8 weeks.
In examining the results, while significant change was reported for plasma triglyceride levels, the findings did not remain significant after adjusting for age, sex, BMI, and baseline values. Furthermore, no significant difference was observed with respect to body weight, blood pressure, fasting plasma lipid, insulin and glucose levels, insulin sensitivity, or glycated hemoglobin concentrations when comparing the blueberry supplement with the placebo. The distinctive findings were in gene expressions and the presence of certain metabolites. The blueberry supplement caused significant changes in 49 gene expressions and the abundance of 35 metabolites, and these differentially regulated genes largely belonged to immune-related pathways.
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