1. A method for treating obesity, the method comprising administering to the subject an effective amount of a glucagon-like peptide-1 (GLP-1)/growth differentiation factor 15 (GDF 15) fusion protein, wherein the GLP-1-GDF 15 fusion protein comprises a GLP-1 peptide, a first linker peptide, a serum albumin protein, a second linker peptide, and a GDF 15 protein, wherein the GLP-1 peptide comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 1-4, and wherein the GDF15 protein comprises an amino acid sequence selected from SEQ ID NO: 31 or SEQ ID NO: 32.
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