The results need to be repeated in human studies before recommendations can be made but there are reasons to be optimistic.
Research published in Current Developments in Nutrition found that the equivalent of one cup of fresh blueberries, given as 22 g of freeze-dried blueberries, may beneficially affect areas of health in overweight men with type 2 diabetes.
The study, “Effect of Blueberry Consumption on Cardiometabolic Health Parameters in Men with Type 2 Diabetes: An 8-Week, Double-Blind, Randomized, Placebo-Controlled Trial”, found that intake of the equivalent of one cup of fresh blueberries (given as 22 g freeze-dried blueberries) resulted in clinically significant improvements in measurable indicators of type 2 diabetes.
These indicators represent ways to measure blood sugar control in those living with diabetes.