GDF15 polypeptides, constructs comprising GDF15, and mutants thereof are provided. In various embodiments the GDF15 polypeptides, constructs comprising GDF15, and mutants thereof, can be of use in the treatment or ameliorating a metabolic disorder. In various embodiments the metabolic disease or disorder is type 2 diabetes, obesity, dyslipidemia, elevated glucose levels, elevated insulin levels and diabetic nephropathy.