Preventive effect of pressed degreased walnut meal extracts on T2DM rats by regulating glucolipid metabolism and modulating gut bacteria flora

Pressed degreased walnut meal (WM) was prepared from walnut kernel by cold-press deoil. It was rich in polyphenols with high activities of lowering lipids, antioxidation, anti-inflammation, and others, but the hypoglycemic activity has scarcely been reported. The purpose of this research was to investigate the preventive effect of the extracts of WM (WMP) on T2DM rats and the regulation of WMP on intestinal flora. Some results showed that WMP significantly held FBG, FINS and GSP, OGTT, the serum and hepatic TG, TC, HDL-C, LDL-C, AST, ALT, LPS, TNF-α, IL-6, and the hepatic MDA, CAT, SOD, as well as, prevented the pathological damage of the liver and the pancreas. The results of 16SrDNA sequencing demonstrated that WMP impeded the changes of intestinal flora in feces, mainly including Firmicutes, Bacteroidetes, and Proteobacteria. These indicated that WMP had promising effects on T2DM, which could be associated with the modulation of gut bacteria.