This study adopted the criteria of WHO for Asia area and the Department of Health (DOH), Executive Yuan, Taiwan to define the obesity. The prevalence of obesity for WHO definition modified for Asians and DOH among Taichung residents aged forty years old and over is 37.34% and 18.79%, respectively. For the effectiveness of weight control educational programs, after 6-month intervention, reductions in weight, BMI, waist, hip, arm, and bad diet habit were observed in all groups. And after 6-month intervention, reductions in BMI is significantly greater in the individualized and fellowship weight control groups than in the "health education group". After 6-month educational intervention, metabolic syndrome in the individualized and fellowship health education groups decreased from 78.48% and 72.84% to 60.76% and 61.73%, respectively, which corresponded to reductions of 17.72% and 11.11% of baseline metabolic syndrome.