Disclosed are compounds, compositions and methods for treating various diseases, syndromes, conditions and disorders, including those mediated by inhibition of fatty acid synthase (FASN) enzyme, such as, cancer, obesity or related discorders, and liver related disorders. Such compounds are represented by formula (I) as follows: wherein L1, a, b, m, n, R1, R2, R3, R4, and R5 are defined herein.