megarexia
n.— «Reverse anorexia was first diagnosed in the early 1990s by Dr. Harrison Pope, a Harvard psychiatrist and a bodybuilder. In addition to Pope’s research, Dr. William N. Taylor, an expert on anabolic steroids, found that steroid users also develop distorted body images so that they perceive their reflections in the mirror as smaller than they actually are; Taylor called his discovery megarexia.» —by Lynne Luciano Looking Good: Male Body Image in Modern America Jan. 9, 2002. (source: Double-Tongued Dictionary)