Peptide analogs of peptide YY (PYY), compositions comprising them, and methods of using those analogs or compositions for the treatment and prevention of metabolic disorders, for example disorders of energy metabolism such as diabetes and obesity, and for reduction in appetite, reduction in food intake or reduction of calorie intake in a subject, are provided herein.PYYのペプチド類似体、前記類似体を含む組成物、並びに、代謝障害、例えば、エネルギー代謝障害、例えば、糖尿病及び肥満の治療及び予防のため、及び対象の食欲減少、食物摂取量の減少又はカロリー摂取量の減少のための前記類似体の使用方法が、本明細書中に提供される。