The number of Japanese people living overseas is reported to be 800,000,12,000 of them in Indonesia. The present paper concerns life-style related diseases and risk factors in the Japanese living in Indonesia, most of whom are business bachelors. The subjects consisted of 63 adult male Japanese with an average age of 55.4 years ; 70% of them were business bachelors. In order to consult about their health, they visited our traveling doctor group sent by consignment of the Ministry of Foreign Affairs. Life-style related diseases and their risk factors were investigated by interview, questionnaire, physical measurements, and simple examinations. The results were compared with age-adjusted statistical data of Japanese nationwide researches. Favorable results were obtained for BMI (Body Mass Index, 22.5±2.8 [mean±S.D.] vs. 23.5; 0.01), prevalence of hypercholesterolemia (11.1% vs. 26.8%;p<0.005), prevalence of hyperuricemia (11.1% vs. 22.2% p<0.05) and prevalence in the rate of habitual drinking (25.4% vs. 51.6;p<0.001). The same results as the standard statistical values were obtained in blood pressure (systolic pressure : 134.0±20.8 mmHg vs. 136.9 mmHg; n.s., diastolic pressure : 81.6±12.2 mmHg vs. 83.3 mmHg;n. s.) and prevalence of positive urine glucose (11.1% vs. 10.9%;n. s.). Worse results were shown for habitual smoking (63.5% vs. 47.6%;p<0.05) and physical activity ("decreased" in 41%,"the same as before" in 40%, and "increased" in 19%). Anxiety about health was reported in 48% of subjects. Decreased risk factors seemed to be paradoxical, because loss of body weight was due to the stress reaction to altered environment including diet rather than positive health promotion behavior. Worsening life style conditions were also affected mainly by environmental factors. Japanese livings in a developing country are under many stressful conditions,such as different climate,culture and life style, challenging personal relations with employees,infection,poor sanitary conditions and poor medical conditions. It is necessary to construct a support system for health management including mental health using local networks and information technology.
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