Using data from about 600 000 adults over 26 years, researchers have concluded that the lifetime risk of developing type 2 diabetes for the average American 20-year-old rose from 20% for men and 27% for women in 1985, to 40% for men and 39% for women in 2000. The largest increases were in Hispanic men and women, and non-Hispanic black women, for whom lifetime risk now exceeds 50%.
http://www.eurekalert.org/pub_releases/2014-08/tl-tld081214.php
Gregg, E. W., Zhuo, X., Cheng, Y. J., Albright, A. L., Narayan, K. M. V., & Thompson, T. J. (2014). Trends in lifetime risk and years of life lost due to diabetes in the USA, 1985–2011: a modelling study. The Lancet Diabetes & Endocrinology, 2(11), 867–874. http://doi.org/10.1016/S2213-8587(14)70161-5