Ten-year Follow-up of Obesity and Obesity-related Metabolic Disorders in Male Rural Japanese Workers

Abstract

Objectives: Prevention of obesity is a high priority of health management at workplaces. We conducted a follow-up study of obesity and obesity-related metabolic disorders in Japanese male workers. Subjects and Methods: Ninety-eight male workers engaged in the operation of a nuclear power plant in Shimane Prefecture, aged 41 ± 8 years in 2006, were subjected to regular health check-ups in 1996 and 2006. Results: The changes in their body weights and metabolic parameters (blood pressure, AST, ALT, γ-GTP, LDL-cholesterol, HDL-cholesterol, triglycerides, glucose and uric acid) were compared by BMI class and age group. Twenty-three percent of the subjects fell within the 23.0 to 24.9 BMI range, and 23% were over 25.0 BMI. Body weight increased significantly, by 3.6 ± 5.3 kg in all subjects, but there was no significant difference in weight gain over the 10 years by age or BMI group. Weight gain was positively associated with metabolic parameters, such as the values of systolic blood pressure, ALT, triglycerides and uric acid, and negatively associated with the value of HDL-C. Conclusions: Japanese male workers, regardless of age and BMI at baseline, experienced an increase of body weight and obesity-related metabolic disorders. Therefore, health professionals in the workplace should consider educating workers about stress-coping methods to reduce job stress, promote a health-supportive environment, such as healthy menus in employee cafeterias and fitness clubs, and be cognizant of high-risk factors in the individual employee.