Many studies confirm that obesity is associated with the risk of type2 diabetes, but not many longitudinal studies have observed the incidence of obesity in type2 diabetes. This study aims to determine trends and determinant of obesity in type2 diabetes aged 35-65 years in Bogor City. A longitudinal design study using secondary data from Cohort Study of NCD year 2015-2017. Time series analysis for 3 years found that the trend of obesity prevalence in type2 diabetes decreased from 71.6%, 69.1%, to 64.2%. The trend of risk factors for the incidence of obesity, such as energy, fat intake and physical activity, increased significantly in 2017. The reduction in the prevalence of obesity is associated with changes in healthy lifestyle (intentional weight loss) and due to poor glycemic control or other disease (unintentional weight loss). The results of determinant analysis of the incidence of obesity are known in year 2015 fat intake is a dominant factor (OR:4.88; 95% CI:1.48-16.06) also influenced by gender, with carbohydrate intake as a confounder. In 2016 fat intake was a dominant factor (OR:5.71; 95% CI:1.48-22.03) also influenced by carbohydrate intake, with physical activity, stress, smoking habits and gender as a confounder. In 2017 carbohydrate intake was a dominant factor (OR:6.84; 95% CI:2.13- 21.98) with fat intake as a confounder.