Selenium-rich yeast improve HFD-induced abnormal lipid metabolism in ApoE ^−/− mice: inhibit oxidative stress, reorganise gut microbiota, and enhance cognitive ability

Selenium-rich yeast (SeY) is a dietary supplement known to confer multiple health benefits, but its effects on HFD-fed ApoE^-/- mice were previously unclear. In this study, it was shown that the intervention of SeY could decrease the body weight (7.69%), as well as the levels of both TC and TG for livers (43.36 and 14.50%) and serum (25.34 and 28.67%). Conversely, the HDL-C levels were increased high to 190%, as well as the antioxidant capacity, reflected in the increased levels of the CAT, SOD, and GSH-Px in both the liver (16.93, 22.06, and 17.59%) and the serum (40.67, 113.76, and 19.83%). SeY could further regulate mRNA levels related to lipid synthesis and transport. Moreover, the anti-hyperlipidemic effects of SeY were manifested in enriching SCFAs-producing bacteria, and the cognitive impairment caused by HFD was also alleviated. Overall, all of the results indicated the effect of SeY in regulating abnormal lipid metabolism and developing functional dietary supplements.