Cochrane Database of Systematic Reviews 2009, Issue 1.

Low glycaemic index, or low glycaemic load, diets for diabetes mellitus
Diana Thomas, Elizabeth J Elliott
Cochrane Database of Systematic Reviews 2009, Issue 1.
The result of Thomas et al's research suggests that a low glycaemic index or low glycaemic load diet could be a used in conjunction with other therapies to control blood glucose in people with diabetes.
Abstract