A hormone imbalance is being blamed in the gaunt appearance of Apple CEO Steve Jobs. Rumored to be stricken by a number of mysterious illnesses ranging from cancer to anorexia, Jobs appeared enviously thin at last year's Macworld Expo, which starts today. According to an AP report, "Jobs, 53, said in a public letter that his thinness had been a mystery even to him and his doctors until a few weeks ago, when =sophisticated blood tests= confirmed that he has 'a hormone imbalance that has been `robbing' me of the proteins my body needs to be healthy.'" So have no fear Mac sect members, Jobs will remain CEO of Apple.