The aim of Volume 11 is to provide evidence on the indicators of fluid distribution and cellular integrity evaluated by nioelectrical impedance analysis in athletes of different performance levels and non-athletes. The second chapter presents a specific examination of the aryl hydrocarbon receptor among xenobiotic receptors, with a commentary on the preventive and therapeutic abilities of lignans against various diseases associated with the aryl hydrocarbon receptor signaling pathway, including cancers, teratogenesis, inflammatory bowel diseases, osteoarthritis, metabolic syndrome and diabetes, allergic diseases, autoimmune diseases, Alzheimer's disease, Parkinson's disease, leukemias and lymphomas. Additionally, the authors discuss scrub typhus, a bacterial disease caused by Orientia tsutsugamushi (O. tsutsugamushi), and how it is recognized as an important cause of fever in Asia. The objective of the next section is to conduct a literature review to identify key risk factors that contribute to the risk of infection and transmission of disease in residential aged care and community care settings. The indications and complications of surgical management of Choanal atresia will be thoroughly illustrated in the followingchapter, mainly focusing on the role of the transnasal endoscopic approach. Recently, a great deal of emphasis has been placed on the creation of more effective drugs for prevention and management of obesity and obesity-related diseases. The penultimate chapter examines the peptide fraction derived from tissue of Antarctic hydrobiont and how it has beneficial effects on the diet induced obesity in rats through the influence on oxidative status, development of inflammation, and disorders of the serotonergic system, which are considered to be the key pathogenic mechanisms of obesity-associated metabolic disturbances. The focus of the final chapter is to describe the demographic, clinical and microbiological characteristics of S. maltophilia infections in pediatric patients during a two year period (2016 to 2018) in a tertiary-care hospital in southern Brazil.