Obesity is becoming a global epidemic problem in both children and adults of industrialized countries because of alterations of life style including high-calorie food intake and lack of aerobic exercise. Here, we present a case of Judo wrestler with morbid obesity associated with various lethal complications such as juvenile hypertension, renal dysfunction, deep vein thrombophlebitis, pulmonary infarction, polycythemia and bronchial bleeding. All of these obesity-associated complications were treated intensively under hospitalization. This case is now under careful follow-up in outpatient clinic. In this article, we address the importance of weight reduction after retiring the vigorous sport such as Judo by calorie restriction and habitual aerobic exercise.