Medical Monday: New Research on Dietary Polyphenols
November 19, 2018
I came across a new article from the Journal of Agricultural and Food Chemistry that managed to catch my eye despite my usual avoidance of grape and wine medical research. In short, the authors argue that polyphenol-rich grape seed flour may have a greater antiobesity health benefit when consumed in conjunction with the lactic acid bacteria Lactobacillus kefiri. The paper is still awaiting print publication, but may be found online at the links below (access to J. Agri. Food Chem. may be required).
The interaction between prebiotics and probiotics may exert synergistic health benefits. This study investigated the combined effects of polyphenol-rich wine grape seed flour (GSF), a prebiotic, and lactic acid bacteria (LAB) derived from kefir, a probiotic, on obesity-related metabolic disease in high-fat diet (HFD) induced obese (DIO) mice. DIO mice were fed with HFD with 6% microcrystalline cellulose (CON) or HFD supplemented with GSF (5% or 10% GSF), HFD with LAB orally administrated (LAB), or HFD with a combination of GSF and LAB orally administrated (GSF+LAB) for 9 weeks. The vehicle, saline, was also orally administered to the CON and GSF groups. In comparison to CON, all GSF and LAB groups showed a reduction (P < 0.05) in HF-induced weight gain, liver and adipose tissue weights, plasma lipid concentrations, insulin resistance, and glucose intolerance. The combination of 10% GSF and LAB showed synergistic effects (P < 0.05) on body weight gain, plasma insulin and total cholesterol concentrations, and cecum propionate contents. Plasma zonulin and cecum propionate concentrations and intestinal FXR gene expression were (P < 0.05) correlated with body weight gain. A pathway analysis of microarray data of adipose tissue showed that the combination of GSF and LAB affected genes involved in metabolic and immunological diseases, including inflammasome complex assembly (P < 0.05). In conclusion, a combination of GSF and LAB inhibited HF-induced obesity and inflammation via alterations in intestinal permeability and adipocyte gene expression.