LEP and obesity due to melanocortin 4 receptor deficiency: We demonstrated that KBH-1, as an herbal composition of Polygala tenuifolia, Curcuma longa, and Saururus chinensis extracts, improved hepatic steatosis and leptin resistance in a HFD-induced obesity model through the increase of AMPK phosphorylation and the up-regulation of leptin-mediated signals.