1. A method for treating a metabolic disease or disorder in a human subject suffering from said metabolic disease or disorder by inhibiting secretion of calcitonin gene-related peptide (CGRP) from one or more C-afferent sensory nerve fibers, comprising: applying, via a pulse generator in operable communication with an implantable lead, an electrical impulse to one or more C-afferent sensory nerve fibers innervating pancreatic beta cells in the subject, the electrical impulse configured to have a frequency ranging from 60 to 10,000 Hz and further configured to inhibit the secretion of CGRP from the one or more C-afferent sensory nerve fibers to treat the metabolic disease/disorder.