Janet, Don't want you and your friends dying of curiosity re: MSUD. It stands for Maple Syrup Urine Disease, an inborn error of metabolism. To "quote" my ©1972 textbook on nursing & nutrition (can you believe I've kept it): This disease... so called because of the odor of maple syrup of the urine. Infants can't metabolize the three-branched chain amino acids - leucine, isoleucine and valine. The symptoms develop a few days after birth, and babies die with severe neurologic symptoms and high levels of unmetabolized amino acids in the body fluids. Hope this helps! Diana Dietz, RN, BSN