Associations of general and central adiposity with incident diabetes in Chinese men and women.

Objective We assess associations of general and central adiposity in middle-age, and of young adulthood adiposity, with incident diabetes in adult Chinese, and estimate the associated population burden of diabetes. Research Design and Methods The prospective China Kadoorie Biobank enrolled 512,891 adults aged 30-79 years from 10 localities across China during 2004-08. During 9.2 years follow-up, 13,416 cases of diabetes were recorded among 482,589 participants without diabetes at baseline. Cox regression yielded adjusted hazard ratios (HRs) for incident diabetes associated with measures of general (eg, BMI, BMI at 25y) and central (eg, waist circumference [WC]) adiposity. Results Mean (SD) BMI was 23.6 (3.4) kg/m2 and 3.8% had BMI %30 kg/m2. Throughout the range examined (19-32 kg/m2), BMI showed a positive log-linear relationship with diabetes, with adjusted HRs per SD higher usual BMI greater in men (1.98, 95% CI 1.93-2.04) than women (1.77, 1.73-1.81) (p for heterogeneity Conclusions Among relatively lean Chinese adults, higher adiposity—general and central—was strongly positively associated with risk of incident diabetes. The predicted continuing increase in adiposity in China foreshadows escalating rates of diabetes.