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The anti-obesity effects of mushroom chitosan prepared from Flammulina velutipes were investigated using an animal model with diet-induced obesity. In this study, 5-week-old imprinting control region (ICR) mice were divided into six groups of 10 mice each and fed different diets based on the MF powdered diet (standard diet) for 6 weeks: standard diet control group, high-fat diet control group (induced dietary obesity) consisting of the standard diet and 20% lard, and mushroom chitosan groups consisting of the high-fat diet with mushroom chitosan added at 100, 500, 1,000, and 2,000 mg/kg body weight. On the final day of the experiment, mean body weight was 39.1 g in the high-fat control group and 36.3 g in the 2,000 mg/kg mushroom chitosan group, compared to 35.8 g in the standard diet control group. In the mushroom chitosan groups, a dose-dependent suppression of weight gain and marked improvements in serum triglycerides, total cholesterol, LDL-cholesterol, and HDL-cholesterol were found. The mushroom chitosan groups showed fewer and smaller fat deposits in liver cells than the high-fat diet control group, and liver weight was significantly reduced. Glutamic oxaloacetic transaminase (GOT) and glutamate pyruvic transaminase (GPT), which are indices of the hepatic function, all showed dose-dependent improvement with mushroom chitosan administration. These results suggested that mushroom chitosan acts to suppress enlargement of the liver from fat deposition resulting from a high-fat diet and to restore hepatic function. The lipid content of feces showed a marked increase correlated with the mushroom chitosan dose. These findings suggest the potential use of mushroom chitosan as a functional food ingredient that contributes to the prevention or improvement of dietary obesity by inhibiting digestion and absorption of fats in the digestive tract and simultaneously promotes lipolysis in adipocytes.

Improvement of Diet-induced Obesity by Ingestion of Mushroom Chitosan Prepared from <i>Flamm</i><i>ulina velutipes</i>