A new study published in the open-access science journal PLoS One offers some of the strongest evidence yet associating sugar, independent of other diet and lifestyle factors, with type 2 diabetes—a link that the sugar industry has sought for decades to debunk.
The study's four authors, including Robert Lustig of the University of California-San Francisco, examined data on sugar intake and diabetes prevalence in 175 countries "controlling for other food types (including fibers, meats, fruits, oils, cereals), total calories, overweight and obesity, period-effects, and several socioeconomic variables such as aging, urbanization and income."
For each bump in sugar "availability" (consumption plus waste) equivalent to about a can of soda per day, they observed a 1 percent rise in diabetes prevalence. This is a correlation, of course, and correlation does not necessarily equal causation. On the other hand, as the authors note in a lay summary, this "is far stronger than a typical point-in-time medical correlation study."
"No other food types yielded significant individual associations with diabetes prevalence after controlling for obesity and other confounders," the PLoS article states. "Differences in sugar availability statistically explain variations in diabetes prevalence rates at a population level that are not explained by physical activity, overweight or obesity."
The correlation, the authors also reported, was "independent of other changes in economic and social change such as urbanization, aging, changes to household income, sedentary lifestyles, and tobacco or alcohol use. We found that obesity appeared to exacerbate, but not confound, the impact of sugar availability on diabetes prevalence, strengthening the argument for targeted public health approaches to excessive sugar consumption."