http://ajcn.nutrition.org/content/79/5/774.long#ref-14
Below shows the year over year trends of carbohydrate consumption increase vs diabetes and obesity increases in the US from 1960 through 1997.
4. Centers for Disease Control and Prevention, National Center for Health Statistics, Division of Health Interview Statistics. Census of the population and population estimates. Hyattsville, MD: Centers for Disease Control and Prevention, 1997.
14. Jenkins DJ, Wolever TM, Taylor RH, et al. Glycemic index of foods: a physiological basis for carbohydrate exchange. Am J Clin Nutr 1981;34:362–6.
17. Centers for Disease Control and Prevention. Diabetes surveillance 1999. Atlanta: US Department of Health and Human Services, 1999.