Ingesting retrograded rice (Oryza sativa) starch relieves high-fat diet induced hyperlipidemia in mice by altering intestinal bacteria

•Ingesting retrograded starch reduced the cholesterol levels of high-fat diet mice.•Ingesting retrograded starch decreased the ratio of Firmicutes/Bacteroidota.•Ingesting retrograded starch increased butyric acid and secondary bile acids levels.•Bacteroides were positively linked to butyric acid with anti-inflammatory functions.