Book excerpt: The NPY-family of peptides encompasses several groups of neurotransmitters and hormones, which exert diverse biological and pathological actions that bear on all major vital systems. The recognition of the role of NPY in stimulation of food intake has already resulted in discovery of potent and selective NPY receptor Y-5 antagonists which are in clinical development for obesity while NPY Y1 receptors are targeted for cardiovascular indications. Research into the multiple functions of NPY and its receptors in neurological and affective disorders are also actively pursued. This book is a unique compilation of the most recent breakthroughs in NPY/PYY neurobiology, cardiovascular and metabolic disorders, written by internationally renowned experts with the objective to synthesize leading concepts and data in support for translational medicine.