Abstract: The present disclosure relates a method for reducing animal weight, comprising administering to a patient in need thereof a therapeutically or prophylactically effective amount of a mulberry extract. The mulberry extract comprises: 3% to 99% of an alkaloid, 0.2% to 70% of a polysaccharide, 0% to 50% of an amino acid, 0% to 10% of flavone, and 0% to 25% of other components. The mulberry extract of the present disclosure can be used for controlling weight gain, and has a good therapeutic effect on type 2 diabetes with obesity.

Abstract: Provided are a polypeptide containing disulfide bonds and capable of inhibiting activity of serine protease, and a use thereof, relating to three types of linear polypeptide molecules, respectively capable of inhibiting the activity of small intestine protein metabolic enzymes such as trypsin, chymotrypsin, and elastase. Said polypeptide molecules may be broadly fused to another polypeptide or protein drug capable of treating a disease, so as to form a hybrid peptide. The hybrid peptide may inhibit the degradation of metabolic enzymes to improve the stability of a peptide or protein drug for treating a disease, such that the curative effect of direct injection administration is improved, while also facilitating direct administration absorption of the polypeptide or protein drug in the small intestine, and implementing oral administration of the protein polypeptide drug.