Disclosed is a peptide comprising the amino acid sequence Xaa1 Xaa2 Xaa3 G1y4 Thr5 Phe6 Thr7 Ser8 Asp9 Tyr10 Ser11 Lys12 Tyr13 Leu14 Xaa15 Xaa16 Xaa17 Xaa18 Xaa19 Xaa20 Xaa21 Xaa22 Xaa23 Xaa24 Trp25 Leu26 Xaa27 Xaa28 Xaa29 Xaa30 Xaa31 Xaa32 Lys33 Asn34 Asn35 Ile36 Ala37. The peptide is used in the manufacture of a medicament for reducing appetite in a subject, reducing food intake in a subject or reducing calorie intake in a subject, reducing body weight in a subject, reducing body weight gain in a subject or increasing energy expenditure in a subject.